Press Releases

Chris Fogg 10/21/25 Chris Fogg 10/21/25

Perpetua Resources Breaks Ground on the Stibnite Gold Project

The Project has the Only American Reserve of Critical Mineral Antimony

American Antimony Needed to Counter Chinese Export Ban

BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced that the Company is breaking ground on early works construction for the Stibnite Gold Project (the “Project”) today. This milestone achievement comes after the Company posted $139 million in construction phase financial assurance for the Stibnite Gold Project and received Notice from the U.S. Forest Service (“USFS”) that the requirements of 2025 Record of Decision (“ROD”) necessary to start construction had been satisfied, the Plan of Operations had been signed, and the Project could enter construction.

“Today, we break ground on the Stibnite Gold Project,” said Jon Cherry, Perpetua Resources President and CEO. “As America’s answer to China’s antimony export bans, we are focused on swiftly and safely bringing our antimony and gold project into development. After nine years of permitting, Stibnite can once again serve this country’s national interest. We are proud of our work to bring this essential project online to provide critical resources while restoring an abandoned mine site. With our reclamation performance bond to reclaim the work we undertake at the Project site in place, we officially started early works construction today and are making good on our promises to Idaho and America.”

Perpetua Resources received the Final ROD in January 2025 and in September 2025, received its conditional Notice to Proceed from USFS indicating that the requirements of the ROD necessary to start construction have been satisfied, and that construction may commence upon the Company posting financial assurance. On October 17, 2025, the Company posted financial assurance secured with cash on hand in order to commence early works construction at the Project and expects to replace the current arrangements with other non-cash financial assurance arrangements prior to or in connection with finalizing the full financing package for the Project.

The Stibnite Gold Project moves into development after nine years of rigorous permitting approvals, a combined award of $80 million in Department of War funds, and prioritization under the Trump Administration’s Transparency Project initiative. The Project hosts America’s only reserve of the critical mineral antimony, a key component in defense and industrial applications, and we believe is the nearest-term opportunity to meet defense and commercial demand.

In addition to the Project’s strategic significance producing antimony, the Project is projected to be one of the highest-grade open-pit gold mines in the United States, with gold reserves of approximately 4.8 million ounces, and is expected to produce approximately 450,000 ounces of gold annually over its first four years of production. The Project is also designed to clean up legacy contamination, reconnect fish to their native spawning grounds, and restore habitat at the historical Stibnite mine site in central Idaho.

Perpetua anticipates more than 950 direct jobs during the construction period and more than 550 direct jobs during operations. In September 2025, Perpetua received a preliminary project letter and indicative term sheet from the U.S. Export Import (“EXIM”) Bank’s Make More in America and China Transformational Export Programs to support $2 billion in debt financing and expects final EXIM Board consideration by the spring of 2026.

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

FORWARD-LOOKING INFORMATION

Investors should be aware that the U.S. EXIM Letter of Interest (“LOI”), PPL and indicative term sheet are non-binding and conditional, and do not represent a financing commitment. A funding commitment, if any, is conditional upon successfully completing the due diligence and underwriting process, which may not be completed on the expected timeline, or at all. If the Company’s application is approved, there can be no assurance that the U.S. EXIM financing will be for the full amount indicated in the LOI or the increased amount requested in the application, or that the approved U.S. EXIM financing will be sufficient for the Company to commence construction of the Project. Further, release of funding under any such commitment would be subject to the satisfaction of certain conditions and covenants by the Company.

Investors should be aware that the Stibnite Gold Project’s designation as a Transparency Project and inclusion in the FAST-41 Program does not imply endorsement of, or support for, the Stibnite Gold Project by the federal government, or create a presumption that the Stibnite Gold Project will be approved, favorably reviewed by any agency or receive federal funding. The designation of a project as a Transparency Project and inclusion in the FAST-41 Program may be reconsidered based on updated information.

Cautionary Statement Regarding Reserve and Technical Information

The reserves information in respect of the Stibnite Gold Project in this news release is based upon information contained in the technical report titled “Stibnite Gold Project, Feasibility Study Technical Report, Valley County, Idaho” dated effective December 22, 2020 and issued January 27, 2021 (the “2020 Feasibility Study”), which is summarized in the Company’s Technical Report Summary, dated as of December 31, 2021, and amended as of June 6, 2022 (the “TRS”). Such information is as of December 30, 2020 and is subject to the assumptions, exclusions and qualifications set forth in the 2020 Feasibility Study and the TRS. The 2020 Feasibility Study was prepared in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects and the TRS was prepared in accordance with the mining property disclosure rules specified in Subpart 1300 promulgated by the SEC. For additional information regarding the TRS and the 2020 Feasibility Study, as well as the Company’s 2025 supplemental financial update, investors are encouraged to refer to the Company’s Form 10-K for its fiscal year 2024, filed with the SEC on March 19, 2025. Data regarding domestic antimony reserves based on U.S. Geological Survey, Mineral Commodity Summaries, dated as of January 2025.

Chris Fogg 10/14/25 Chris Fogg 10/14/25

MEDIA ADVISORY: Perpetua CEO to Join FOX Business to Discuss China, Critical Minerals

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Segment Scheduled to Air Live on Wednesday, October 15 at 7:30am ET

BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) today announced that Perpetua President and CEO, Jon Cherry, is scheduled to appear live on the FOX Business Network (FBN) tomorrow, October 15, 2025 at 7:30am ET to discuss China, critical minerals, and antimony with Anchor Maria Bartiromo.

WHO:

Jon Cherry, President & CEO of Perpetua Resources

Maria Bartiromo, Anchor of Mornings with Maria on FOX Business

WHAT:

Perpetua President & CEO Jon Cherry will appear on Mornings with Maria on FOX Business to discuss China’s rare earth and critical minerals control, and next steps for the Stibnite Gold Project, including the commencement of early works construction which could begin as soon as next week.

WHEN:

Wednesday, October 15, 2025

7:30am ET

WHERE TO WATCH:

Viewers catch watch the segment live on the FOX Business Network (FBN) or by visiting www.foxbusiness.com.

For more details, visit www.foxbusiness.com.

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

FORWARD-LOOKING INFORMATION

Chris Fogg 10/1/25 Chris Fogg 10/1/25

Perpetua Resources Announces Appointment of Mark Murchison to Succeed Jessica Largent as Chief Financial Officer

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Seasoned mining finance executive, Mark Murchison, brings over 25 years of finance, mining and capital project experience

Jessica Largent to remain as advisor to CFO through the end of 2025 to facilitate transition and support ongoing project financing

Early works construction expected to commence this fall after posting Financial Assurance

BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced today that Jessica Largent has notified the Board of Directors of her intent to step down from her role as Chief Financial Officer and as a member of the Board of Directors of the Company, effective October 1, 2025, and to retire on January 2, 2026, having served in key financial roles to shepherd the Stibnite Gold Project (“Project”) through permitting and early financing. The Board of Directors has appointed Mark Murchison to succeed Ms. Largent as Chief Financial Officer, effective October 1, 2025.

“We are extremely grateful for Jessica’s thoughtful leadership as Perpetua worked through the permitting process and prepared for construction,” said President and CEO, Jon Cherry. “Having raised over $650 million in equity, royalty, and Department of War grant funding over the past four years, and initiating the Company’s application for up to $2.0 billion in project financing from the Export-Import Bank of the United States, Jessica leaves the Company well positioned to secure project financing and transition to full construction in 2026. We are excited to welcome Mark to pick up the reins for the next stage of development and believe his global capital project experience and proven leadership will be an asset as the Project moves into construction.”

Mark Murchison joins the Company with over 25 years of experience in metals and mining, including seven years as Chief Financial Officer of Alacer Gold (“Alacer”) and 12 years in various financial leadership roles at Rio Tinto. Mr. Murchison joins Perpetua from US Vanadium, a private vanadium producer based in Arkansas, where he has served as Chief Financial Officer and Secretary since 2022. Mr. Murchison has significant experience in capital project management, including raising project finance and managing capital allocation and planning for a $750-million autoclave expansion at the Alacer mine in Turkey. During his tenure, Alacer delivered a total shareholder return of more than 300% and culminated in Alacer Gold’s strategic merger with SSR Mining to create a $5.0 billion diversified gold producer. Mr. Murchison will join Perpetua’s management team to lead the finance functions as the Company secures project financing for the Project and commences construction.

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

FORWARD-LOOKING INFORMATION

Investors should be aware that the Company has not entered into any arrangement with respect to the joint financial assurance bonding and may not be able to enter into such arrangements on the anticipated terms and timeline, or at all. In addition, such arrangement, when entered into, may not be sufficient to satisfy the financial assurance conditions required to commence construction under applicable federal and state law.

Chris Fogg 9/26/25 Chris Fogg 9/26/25

Perpetua Resources Unveils Next Steps to Secure Commercial Downstream Antimony Processing

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”), provided an update today on the Company’s ongoing efforts to help secure the American antimony supply chain. The Stibnite Gold Project (“Project”) is the only domestic reserve of antimony in the United States and with the conditional Notice to Proceed from the U.S. Forest Service in hand, the Company is ready to enter into long-term off-take arrangements for commercial grade antimony. The Company plans to issue a Request for Proposal (“RFP”) to assess the technical and economic feasibility of multiple emerging potential off-site processing facilities from third parties to secure antimony for domestic uses. The RFP review process will evaluate companies on potential production capacity, capitalization, reliability, environmental track record, credit worthiness, production readiness, transport reliability, and the ability to meet end user’s product requirements and market needs, among other factors.

The RFP process will evaluate processing suitability for the portion of Perpetua’s 148-million-pound antimony reserve designated for commercial purposes and is separate from the work currently underway between Perpetua and the U.S. Army to secure the domestic supply chain of mil-spec antimony trisulfide through the Defense Ordinance Technology Consortium (“DOTC”) for which the Company has been awarded up to $22.4 million under an Ordnance Technology Initiative Agreement.

“America needs a secure and robust supply of antimony,” said Jon Cherry, President and CEO of Perpetua Resources. “Work has been underway between the U.S. Army and Perpetua to advance downstream processing for defense needs; but it is now time we also respond to the needs of the U.S. manufacturing and industrial sectors. We are encouraged by emerging opportunities to expand domestic mineral processing capacity in America and intend to make well-informed, market-based decisions when selecting a partner.”

To date, the Company has engaged in discussions with numerous parties including, but not limited to, Clarios, Glencore, Nyrstar, Sunshine Silver and Trafigura. The Company is pursuing processing arrangements that maximize value for shareholders while securing an antimony supply chain for U.S. consumers.

The Company intends to issue the RFP in the coming weeks and make a final selection in the fourth quarter of 2025, subject to due diligence review.

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

About Perpetua Resources and the Stibnite Gold Project

FORWARD-LOOKING INFORMATION

Cautionary Statement Regarding Reserve and Technical Information

Chris Fogg 9/19/25 Chris Fogg 9/19/25

Perpetua Resources Celebrates Stibnite Gold Project Advancing to Development with State and Federal Officials

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Governor of Idaho, U.S. Army, Department of Defense, and U.S. Department of Agriculture officials among those at Stibnite Gold Project celebration kick-off

Celebration follows U.S. Forest Service Notice to Proceed, indicating Project may begin development upon posting of financial assurance

Perpetua committed to support U.S. Defense Department ‘Ground-to-Round’ Strategy

BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”), hosted leaders from across the country at the historical Stibnite Mining District to celebrate the Stibnite Gold Project (the “Project”) advancing to development after more than 8 years of rigorous permitting review. Idaho Governor Brad Little, U.S. Department of Agriculture Deputy Undersecretary Kristin Sleeper, and U.S. Army Major General John Reim were among those who attended and spoke at the event. All the speakers emphasized the Project’s pivotal role in America’s national security and defense.

“American readiness starts here,” said Perpetua President & CEO Jon Cherry. “After years of thoughtful consideration, public feedback, and intensive review, we are ready to secure American antimony. Backed by the financial power of gold production and a plan to provide meaningful environmental benefits to this historical site, today marks a new chapter in American resilience. We could not be prouder of our work to provide urgently needed antimony for our military defense.”

Earlier today, the Company announced that the U.S. Forest Service had delivered a conditional Notice to Proceed, officially recognizing that Perpetua Resources has satisfied the requirements of the Record of Decision and stating that the Project may move into development upon posting the required financial assurance. The Project, a listed FAST-41 Transparency Project and recipient of $80 million in Department of Defense funds, is expected to produce America’s only mined reserve of the critical mineral antimony, a key component in munitions and advanced defense systems. In addition, the Project is designed to clean up legacy contamination, reconnect fish to their native spawning grounds, restore habitat, and provide hundreds of family-wage jobs.

Given the significant and urgent need to supply American antimony, Perpetua expects to begin early works construction this fall at the Project. During Friday’s ceremony, Cherry presided over a ribbon cutting for Perpetua’s antimony stockpile, signaling readiness to provide the U.S. military with a critically needed supply of antimony from the Stibnite Gold Project.

“The Stibnite project currently holds the largest identified reserve of antimony in the U.S. It is one of the largest antimony reserves outside of foreign control. This mine offers a secure, reliable, domestic resource for military grade antimony sulfide and is aligned with the Army’s ongoing ‘Ground-to-Round’ assured munitions strategy for establishing a complete domestic supply chain, from raw material access to material processing to ammunition production, as we modernize and fortify the Arsenal of Democracy,” said Maj. Gen. John T. Reim, Joint Program Executive Officer Armaments & Ammunition and Picatinny Arsenal Commanding General.

The Stibnite Gold Project is expected to supply up to 35 percent of U.S. antimony demand during its first six years of operations based on the 2025 USGS antimony commodity summary. Antimony is classified as a critical mineral essential for technology, defense, and energy applications. China dominates global antimony mining, processing, and refining, accounts for about 80% of all U.S. antimony imports and, in 2024, China cut off antimony exports. Developing a domestic source of antimony through the Stibnite Gold Project is imperative to America’s security and strategic mineral independence. The Project is projected to be one of the highest-grade open-pit gold mines in the United States, with gold reserves of approximately 4.8 million ounces, and is expected to produce approximately 450,000 ounces of gold annually over its first four years of production. The financial backing of gold production is expected to support the concurrent production of a steady, reliable source of domestic antimony. The U.S. National Defense Stockpile of antimony trisulfide currently holds limited supply for peacetime demand, and the Stibnite Project is well positioned to commence antimony production and reduce the United States’ reliance on foreign adversaries for this critical resource.

Joining the refrain from Washington, DC, U.S. Senator James Risch (R-Idaho) cheered the Project’s advancement.

“A strong domestic supply of critical minerals is vital to America’s future. For too long, excessive regulations have stifled important mining projects, forcing us to rely on foreign adversaries for resources readily available in our own backyard. Today’s news and President Trump’s actions to expand U.S. mineral production are welcome signs that times are changing,” said Risch. “As one of the largest sources of antimony outside of Beijing’s control, the Stibnite Gold Mine will bolster our national security, military readiness, and the Gem State economy. The U.S. must remain a leader in the global race for critical minerals, and I am proud that Idaho is at the forefront of this effort.”

The historical Stibnite Mining District saw a century of mining and produced a secure supply of antimony vital to the Allied war effort in World War II (after the U.S.’s primary source from China was cut off) before it was abandoned by past operators. Now, the Stibnite Gold Project is positioned to once again provide a domestic source critical to U.S. national security and deliver significant environmental and economic benefits to rural Idaho. The Project is designed to reduce the environmental contamination left behind by previous operators, reconnect fish to their native spawning grounds, and restore habitat. To date, the Company has spent more than $20 million to improve water quality on site and cleaned up more than 375,000 tons of legacy waste and tailings. The Project is also expected to bring significant investment to the region, creating more than 950 jobs during construction and over 550 jobs during operations.

“Idaho is proud to celebrate this milestone with Perpetua Resources and showcase the ways we are moving forward valuable projects that create hundreds of good-paying jobs that support Idaho’s rural economy. These jobs will allow Idaho’s young people to build rewarding careers right here in the communities of the West Central mountains,” Governor Brad Little said. “This is exactly the kind of transformative project I want the SPEED Council to embrace. Idaho remains committed to a transparent and streamlined regulatory process to enhance the economic vitality our state and Idahoans’ quality of life.”

During the kick-off ceremony, Cherry presented the Stibnite Foundation with a $350,000 check to share the benefits of the Stibnite Gold Project with the region. The Stibnite Foundation is a 501(c)(3) charitable foundation built to empower the people, environment and communities located closest to the Stibnite Gold Project today and long after the mine closes. It was formed as part of the Company’s Community Agreement. To date, Perpetua has donated $750,000 and given the Foundation 150,000 shares in the company. Pursuant to the Community Agreement, Perpetua will continue making financial contributions as the Project reaches key milestones, and will switch to a profit-sharing partnership during operations.

“It has always been important to our team that the Stibnite Gold Project has a positive impact on our surrounding communities,” said Cherry. “Investing in the Stibnite Foundation allows us to work side-by-side with our neighbors and help them address issues that are most important to them.”

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

About Perpetua Resources and the Stibnite Gold Project

FORWARD-LOOKING INFORMATION

Statements contained in this news release that are not historical facts are "forward-looking information" or "forward-looking statements" (collectively, "Forward-Looking Information") within the meaning of applicable Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes, but is not limited to, the Company’s ability to satisfy financial assurance requirements under applicable federal and state law on acceptable terms and on anticipated timelines, if at all; disclosure regarding the anticipated effects of the SPEED Act; the Company’s ability, in connection with efforts to satisfy financial assurance requirements applicable to the Stibnite Gold Project and to provide additional financing, to enter into an arrangement on acceptable terms and on the anticipated timeline, if at all; the occurrence of the expected benefits from the Project, including providing a domestic source of antimony, national defense benefits, creation of jobs, environmental benefits; expected benefits from the Stibnite Foundation and other community initiatives; the number and nature of jobs expected to be created. In certain cases, Forward-Looking Information can be identified by the use of words and phrases or variations of such words and phrases or statements such as "anticipate", "expect", "plan", "likely", "believe", "intend", "forecast", "project", "estimate", "potential", "could", "may", "will", "would" or "should". In preparing the Forward-Looking Information in this news release, Perpetua Resources has applied several material assumptions, including, but not limited to, that the Company will be able to satisfy all conditions provided in various federal and state permits that must be met to commence construction; that the Company will be able to satisfy financial assurance requirements applicable under applicable federal and state law; that the Company’s proposed financing package will be sufficient to finance permitting, pre-construction and construction of the Stibnite Gold Project or that the Company will be able to secure alternate financing if necessary; and that the current exploration, development, environmental and other objectives concerning the Project can be achieved and that its other corporate activities will proceed as expected. Forward-Looking Information are based on certain material assumptions and involve, known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Perpetua Resources to be materially different from any future results, performance or achievements expressed or implied by the Forward-Looking Information. Such risks and other factors, among other things, risks related to unforeseen delays in the review and permitting process, including as a result of legal challenges to the ROD or other permits; risks related to opposition to the Stibnite Gold Project; risks related to increased or unexpected costs in operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all, as well as include those factors discussed in Perpetua Resources' public filings with the U.S. Securities and Exchange Commission (the "SEC") and its Canadian disclosure record. Although Perpetua Resources has attempted to identify important factors that could affect Perpetua Resources and may cause actual actions, events or results to differ materially from those described in Forward-Looking Information, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that Forward-Looking Information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on Forward-Looking Information. For further information on these and other risks and uncertainties that may affect the Company's business, see the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company's filings with the SEC, which are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedarplus.com. Except as required by law, Perpetua Resources does not assume any obligation to release publicly any revisions to Forward-Looking Information contained in this news release to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Cautionary Statement Regarding Reserve and Technical Information

Chris Fogg 9/19/25 Chris Fogg 9/19/25

Perpetua Resources Receives Notice to Proceed from U.S. Forest Service Authorizing Project Development

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U.S. Forest Service Notice to Proceed indicates Record of Decision requirements have been satisfied and initial construction can commence with placement of financial assurance.

Early works project construction expected to begin this fall.

BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”), received its conditional Notice to Proceed (“Notice”) from the U.S. Forest Service (“USFS”) for the Stibnite Gold Project (the “Project”), which stated the Project has satisfied all requirements outlined in the January 2025 Record of Decision (“ROD”) and that the Project may begin construction conditioned only on the Company posting the joint financial assurance bonding agreed to by USFS, Idaho Department of Lands (“IDL”), and U.S. Army Corps of Engineers (“USACE”) for the Project.

“After 8 years of extensive permitting review and over $400 million invested, it is finally time for the Stibnite Gold Project to deliver for America,” said Jon Cherry, President & CEO of Perpetua Resources. “A united vision to produce critical resources urgently needed for national security and to restore an abandoned site, along with the feedback from our communities, have guided us to this monumental milestone. With the U.S. Forest Service’s Notice to Proceed and the joint financial assurance package approved, we are ready to begin to bring Stibnite back to life as a national strategic asset.”

The Stibnite Gold Project plans to produce America’s only mined resource of the critical mineral antimony, a key component in munitions and advanced defense systems, and seeks to clean up legacy contamination at the historical mine site, reconnect fish to their native spawning grounds, restore habitat, and provide hundreds of family-wage jobs.

In 2025, the Trump Administration placed the Stibnite Gold Project on the Transparency Projects list under the FAST-41 Program, which is intended to support increased domestic mineral production through streamlined and focused permitting.

"Completing federal permitting for Perpetua Resources’ Stibnite Gold Project is a major step towards unlocking America’s critical minerals resources. By redeveloping this historic mining site, we can both restore the environment and secure a domestic supply chain that is essential to our nation’s future,” said Emily Domenech, Federal Permitting Improvement Council Executive Director.

Earlier this week, state and federal agencies agreed on a joint financial assurance package requiring bonding for the Project construction period. In the Notice, the USFS specified to Perpetua that it will sign the Company’s Plan of Operation once financial assurance bonds are placed and that initial construction can begin thereafter. The Company anticipates having the financial assurance posted in the coming weeks.

“The Stibnite Gold Project is poised to once again produce minerals critical to national security and defense, just as it did during World War II,” said Cherry. “We believe this administration’s commitment to boosting efficiency without compromising rigorous environmental standards will have a transformational impact on American mining."

Perpetua Resources began the formal permitting process under the National Environmental Policy Act (“NEPA”) nearly a decade ago in 2016. As the lead permitting agency, the U.S. Forest Service issued a Draft Environmental Impact Statement in 2020, a Supplemental Draft Environmental Impact Statement in 2022, a Final Environmental Impact Statement and Draft Record of Decision in September of 2024, and a Final ROD in January 2025. During the public comment periods, over 23,000 letters were submitted supporting the Project. The final mine plan is designed with the intent to:

Provide restoration of legacy impacts early and concurrent with mining
Open miles of habitat for migrating fish
Reduce the project footprint by 13% over the original design
Uplift wetlands quality and stream habitat quality over existing conditions
Improve water temperature to be at, or below, existing conditions

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

About Perpetua Resources and the Stibnite Gold Project

FORWARD-LOOKING INFORMATION

Statements contained in this news release that are not historical facts are "forward-looking information" or "forward-looking statements" (collectively, "Forward-Looking Information") within the meaning of applicable Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes, but is not limited to, the Company’s ability to satisfy financial assurance requirements under applicable federal and state law on acceptable terms and on anticipated timelines, if at all; the Company’s ability, in connection with efforts to satisfy financial assurance requirements applicable to the Stibnite Gold Project and to provide additional financing, to enter into an arrangement on acceptable terms and on the anticipated timeline, if at all; and the occurrence of the expected benefits from the Stibnite Gold Project, including providing a domestic source of antimony, national defense benefits, creation of jobs and environmental benefits... In certain cases, Forward-Looking Information can be identified by the use of words and phrases or variations of such words and phrases or statements such as "anticipate", "expect", "plan", "likely", "believe", "intend", "forecast", "project", "estimate", "potential", "could", "may", "will", "would" or "should". In preparing the Forward-Looking Information in this news release, Perpetua Resources has applied several material assumptions, including, but not limited to, that the Company will be able to satisfy all conditions provided in various federal and state permits that must be met to commence construction; that the Company will be able to satisfy financial assurance requirements applicable under applicable federal and state law; that the Company’s proposed financing package will be sufficient to finance permitting, pre-construction and construction of the Stibnite Gold Project or that the Company will be able to secure alternate financing if necessary; and that the current exploration, development, environmental and other objectives concerning the Project can be achieved and that its other corporate activities will proceed as expected. Forward-Looking Information are based on certain material assumptions and involve, known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Perpetua Resources to be materially different from any future results, performance or achievements expressed or implied by the Forward-Looking Information. Such risks and other factors include, among other things, risks related to unforeseen delays in the review and permitting process, including as a result of legal challenges to the ROD or other permits; risks related to opposition to the Stibnite Gold Project; risks related to increased or unexpected costs in operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all, as well as those factors discussed in Perpetua Resources' public filings with the U.S. Securities and Exchange Commission (the "SEC") and its Canadian disclosure record. Although Perpetua Resources has attempted to identify important factors that could affect Perpetua Resources and may cause actual actions, events or results to differ materially from those described in Forward-Looking Information, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that Forward-Looking Information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on Forward-Looking Information. For further information on these and other risks and uncertainties that may affect the Company's business, see the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company's filings with the SEC, which are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedarplus.com. Except as required by law, Perpetua Resources does not assume any obligation to release publicly any revisions to Forward-Looking Information contained in this news release to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Chris Fogg 9/8/25 Chris Fogg 9/8/25

Perpetua Resources Receives Preliminary Project Letter and Indicative Term Sheet from the Export-Import Bank of the United States on Potential $2 Billion Debt Financing

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced today that it received a preliminary, non-binding indicative financing term sheet from the Export-Import Bank of the United States (“EXIM“) as part of a Preliminary Project Letter (“PPL”) conveying EXIM’s initial due diligence findings to Perpetua on its application for $2 billion in debt financing from EXIM for the Stibnite Gold Project (“Project”).

Along with the preliminary indicative term sheet, the PPL provides a summary of EXIM’s initial due diligence findings of the Project to date. Perpetua continues to work with EXIM to advance the project through the next stages of EXIM’s due diligence and loan application process. The Company is anticipating final EXIM Board consideration by the spring of 2026.

“Perpetua Resources received its final federal permit for the Stibnite Gold Project in the second quarter of 2025, after eight years of rigorous interagency coordination and review,” said Jon Cherry, President and CEO of Perpetua Resources. “Following the successful equity offering earlier this year, Perpetua is focused on finalizing a potential royalty or stream arrangement with financial assurance guarantees, commencing early works construction in the fall of 2025 while advancing the EXIM debt financing.”

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

About Perpetua Resources and the Stibnite Gold Project

FORWARD-LOOKING INFORMATION

Investors should be aware that the Company has not entered into any definitive agreement with respect to a royalty, streaming or guarantee and may not be able to enter into such agreement on the anticipated terms and timeline, or at all. In addition, the outcomes from such agreement, when entered into, may not be sufficient to satisfy the aggregate obligations of the Company to provide construction phase financial assurance under applicable federal and state law prior to commencing construction. Securing the financial assurance does not guarantee the Company will receive the U.S. Forest Service (“USFS”) notice to proceed under the approved plan of operation and consummating the royalty financing may not satisfy the financial assurance conditions of various federal and state permits required to commence construction.

Statements contained in this news release that are not historical facts are "forward-looking information" or "forward-looking statements" (collectively, "Forward-Looking Information") within the meaning of applicable Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes, but is not limited to, the Company’s ability to successfully secure financing from U.S. EXIM or other sources on acceptable terms, or at all, including the review process and potential outcome of the Company’s U.S. EXIM financing application; the expected timing of, and benefits to the Project of, securing such financing from U.S. EXIM; the Company’s ability to satisfy financial assurance requirements under applicable federal and state law on acceptable terms and on anticipated timelines, if at all; the Company’s ability, in connection with efforts to satisfy financial assurance requirements applicable to the Project and to provide additional Project financing, to enter into a royalty or stream agreement on acceptable terms and on the anticipated timeline, if at all. In certain cases, Forward-Looking Information can be identified by the use of words and phrases or variations of such words and phrases or statements such as "anticipate", "expect", "plan", "likely", "believe", "intend", "forecast", "project", "estimate", "potential", "could", "may", "will", "would" or "should". In preparing the Forward-Looking Information in this news release, Perpetua Resources has applied several material assumptions, including, but not limited to assumptions that the USFS will issue a Notice to Proceed for construction of the Project in a timely manner and as expected; that the Company will be able to satisfy all conditions provided in various federal and state permits that must be met to commence construction; that the U.S EXIM application will be reviewed and approved within the expected timeframe at the amount equal to or higher than the amount indicated in the related letter of intent; that the Company will be able to satisfy the conditions to obtain a funding commitment from U.S. EXIM and to receive committed funds when needed; the ongoing royalty or streaming financing negotiations will proceed in a timely manner and result in a binding agreement on the terms anticipated; that the Company will be able to satisfy financial assurance requirements applicable under applicable federal and state law; that the Company’s proposed financing package will be sufficient to finance permitting, pre-construction and construction of the Project or that the company will be able to secure alternate financing if necessary. Forward-Looking Information are based on certain material assumptions and involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Perpetua Resources to be materially different from any future results, performance or achievements expressed or implied by the Forward-Looking Information. Such risks and other factors include, among other things, risks related to unforeseen delays in the review and permitting process, including as a result of legal challenges to the ROD or other permits; risks related to opposition to the Project; risks related to increased or unexpected costs in operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all, as well as those factors discussed in Perpetua Resources' public filings with the U.S. Securities and Exchange Commission (the "SEC") and its Canadian disclosure record. Although Perpetua Resources has attempted to identify important factors that could affect Perpetua Resources and may cause actual actions, events or results to differ materially from those described in Forward-Looking Information, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that Forward-Looking Information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on Forward-Looking Information. For further information on these and other risks and uncertainties that may affect the Company's business and liquidity, see the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company's filings with the SEC, which are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedar.com. Except as required by law, Perpetua Resources does not assume any obligation to release publicly any revisions to Forward-Looking Information contained in this news release to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Chris Fogg 8/14/25 Chris Fogg 8/14/25

Perpetua Resources Announces Second Quarter 2025 and Recent Highlights

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced today that its unaudited condensed consolidated financial results for the period ended June 30, 2025 were filed. For details, please see the Company’s filings available on EDGAR and SEDAR.

Perpetua Resources’ vision is to provide the U.S. with a domestic source of the critical mineral antimony, develop one of the largest and highest-grade open pit gold mines in the country and restore an abandoned brownfield site. Perpetua Resources is focused on finalizing remaining permits for the Stibnite Gold Project (“Project”) to support early works construction expected to start in the fall of 2025, advancing detailed engineering, long lead procurement and execution planning to be full sanction construction ready in the spring of 2026 and finalizing project financing.

Second Quarter 2025 and Recent Highlights:

Zero lost time incidents or reportable environmental spills.
U.S. Army Corps of Engineers (“USACE” or the “Army Corps”) issued the Section 404 permit for the Project.
Submitted formal application to U.S. EXIM for potential Project debt financing of up to $2.0 billion.
Closed $425 million in gross proceeds from equity financing and subsequently additional gross proceeds of $49 million upon full exercise of an underwriter option, for total aggregate gross proceeds of approximately $474 million.
Announced plan for comprehensive project financing plan for the Project.
Published 2024 Sustainability Report, the Company’s twelfth annual sustainability report.
The Idaho Board of Environmental Quality issued a final order rejecting challenges by certain petitioners to the air permit to construct issued by the Idaho Department of Environmental Quality for the Project and upholding the permit in all respects.

“Perpetua Resources received its final federal permit for the Stibnite Gold Project in the second quarter of 2025, after eight years of rigorous interagency coordination and review,” said Jon Cherry, President and CEO of Perpetua Resources. “Following the successful equity offering in June 2025, and with final state permits and authorizations needed to begin construction expected in the fall of 2025, Perpetua is focused on finalizing a potential royalty or stream arrangement with financial assurance guarantees which is expected to be complete this summer, while advancing the US EXIM debt financing.”

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

About Perpetua Resources and the Stibnite Gold Project

FORWARD-LOOKING INFORMATION

Investors should be aware that the U.S. EXIM Letter of Interest (“LOI”) is non-binding and conditional, and does not represent a financing commitment. A funding commitment, if any, is conditional upon successfully completing the due diligence and underwriting process, which may not be completed on the expected timeline, or at all. If the Company’s application is approved, there can be no assurance that the U.S. EXIM financing will be for the full amount indicated in the LOI or the increased amount requested in the application, or that the approved U.S. EXIM financing will be sufficient for the Company to commence construction of the Project. Further, release of funding under any such commitment would be subject to the satisfaction of certain conditions and covenants by the Company.

Investors should be aware that state regulators are not bound by permitting schedules and anticipated timelines may be delayed materially or not be satisfied.

Statements contained in this news release that are not historical facts are "forward-looking information" or "forward-looking statements" (collectively, "Forward-Looking Information") within the meaning of applicable Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes, but is not limited to, our ability to comply with, obtain and defend permits related to the Project; the Company’s ability to successfully secure financing from U.S. EXIM or other sources on acceptable terms, or at all, including the review process and potential outcome of the Company’s U.S. EXIM financing application; the expected timing of, and benefits to the Project of, securing such financing from U.S. EXIM; the anticipated timing of the issuance of certain state permits or a USFS notice to proceed; the Company’s ability to satisfy financial assurance requirements under applicable federal and state law on acceptable terms and on anticipated timelines, if at all; the Company’s ability, in connection with efforts to satisfy financial assurance requirements applicable to the Project and to provide additional Project financing, to enter into a royalty or stream agreement on acceptable terms and on the anticipated timeline, if at all. In certain cases, Forward-Looking Information can be identified by the use of words and phrases or variations of such words and phrases or statements such as "anticipate", "expect", "plan", "likely", "believe", "intend", "forecast", "project", "estimate", "potential", "could", "may", "will", "would" or "should". In preparing the Forward-Looking Information in this news release, Perpetua Resources has applied several material assumptions, including, but not limited to assumptions that the USFS will issue a Notice to Proceed for construction of the Project in a timely manner and as expected; the remaining state permits will be reviewed, issued in a timely manner and as expected; that the Company will be able to satisfy all conditions provided in various federal and state permits that must be met to commence construction; that the U.S EXIM application will be reviewed and approved within the expected timeframe at the amount equal to or higher than the amount indicated in the related letter of intent; that the Company will be able to satisfy the conditions to obtain a funding commitment from U.S. EXIM and to receive committed funds when needed; the ongoing royalty or streaming financing negotiations will proceed in a timely manner and result in a binding agreement on the terms anticipated; that the Company will be able to satisfy financial assurance requirements applicable under applicable federal and state law; that the Company’s proposed financing package will be sufficient to finance permitting, pre-construction and construction of the Project or that the company will be able to secure alternate financing if necessary. Forward-Looking Information are based on certain material assumptions and involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Perpetua Resources to be materially different from any future results, performance or achievements expressed or implied by the Forward-Looking Information. Such risks and other factors include, among other things, risks related to unforeseen delays in the review and permitting process, including as a result of legal challenges to the ROD or other permits; risks related to opposition to the Project; risks related to increased or unexpected costs in operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all, as well as those factors discussed in Perpetua Resources' public filings with the U.S. Securities and Exchange Commission (the "SEC") and its Canadian disclosure record. Although Perpetua Resources has attempted to identify important factors that could affect Perpetua Resources and may cause actual actions, events or results to differ materially from those described in Forward-Looking Information, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that Forward-Looking Information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on Forward-Looking Information. For further information on these and other risks and uncertainties that may affect the Company's business and liquidity, see the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company's filings with the SEC, , which are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedar.com. Except as required by law, Perpetua Resources does not assume any obligation to release publicly any revisions to Forward-Looking Information contained in this news release to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Chris Fogg 8/6/25 Chris Fogg 8/6/25

U.S. Secretary of Labor, Idaho Governor Visit Perpetua Resources to Discuss Stibnite Gold Project Importance to Securing U.S. Jobs and Critical Minerals

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Stibnite Gold Project Listed as a White House Transparency Project

Perpetua Anticipates 550+ Direct Jobs in Idaho during operations

Perpetua Announces Stibnite Launch Scholarship with College of Western Idaho

BOISE, ID – Today, U.S. Secretary of Labor Lori Chavez-DeRemer and Idaho Governor Brad Little met with Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) in Valley County, Idaho to discuss the Stibnite Gold Project’s strategic importance to the United States and Perpetua’s plans to provide family-wage, in-demand jobs to rural Idaho during the construction and operations of the Stibnite Gold Project. During the visit, Perpetua Resources announced a new education and job training partnership with the College of Western Idaho (CWI).

The Secretary’s visit underscores the Trump administration’s focus on domestic critical mineral projects that are essential to U.S. national security, like the Stibnite Gold Project. The Stibnite Gold Project is designed to restore the environment, provide family-wage jobs to rural Idaho, and produce gold and the critical mineral antimony. The Stibnite Gold Project, which was identified as a “Transparency Project” by the National Economic Development Council, is expected to provide the United States its only domestically mined source of the critical mineral antimony. Given antimony's essential role in hundreds of defense applications, the Department of Defense has granted Perpetua Resources more than $80 million to date to advance the Stibnite Gold Project.

“Perpetua is committed to Idaho,” said Jon Cherry, CEO of Perpetua Resources. “We want our project to benefit local communities, and one of the most tangible ways we can do that is by providing meaningful, well-paying careers. For years, we have been laying the foundation – providing internships, working with local schools and investing in career education for local students – and soon we intend to offer quality, family-wage jobs to hundreds of Idaho workers at the Stibnite Gold Project. It was a true honor to host U.S. Secretary of Labor Lori Chavez-DeRemer and Governor Brad Little and tell them about our efforts to bring jobs to rural Idaho.”

“The Stibnite Gold Project represents exactly the kind of American-led initiative we need to secure our critical mineral supply chains, strengthen national security, and create in-demand, mortgage-paying jobs,” said Secretary Chavez-DeRemer. “Under President Trump’s leadership, the U.S. Department of Labor is committed to working with employers like Perpetua to ensure they have the skilled workforce they need to ramp up domestic production. I’d like to thank Governor Little and Perpetua Resources for hosting me today and providing an update on this important project, which fulfills our mission to put American workers first.”

To advance Perpetua’s commitment to hiring locally, during the Secretary and Governor’s visit, Perpetua Resources announced the creation of the Stibnite Launch Scholarship to support CWI’s Geosciences Department, helping prepare students with real-world, hands-on training for rewarding, high-skill jobs in Idaho’s mining sector. Perpetua presented CWI with a $250,000 check to fund scholarships for 12 or more CWI Geosciences and Mining Technician students each year for the next three years and at least three students per year thereafter.

“Partnerships like this between Idaho businesses and our higher education institutions mean we can keep jobs, economic benefits, and expertise right here in Idaho. I appreciate Perpetua Resources for its commitment to supporting students and families and strengthening rural Idaho,” Governor Little said.

Designed to complement the Idaho LAUNCH grant program, which provides students a one-time opportunity to have 80 percent of their tuition and fees covered at an eligible institution, the Stibnite Launch Scholarship can fund the remaining 20 percent of a CWI student recipient’s tuition and fees, closing the funding gap and providing financial relief to [eligible students.

“CWI is proud to be named the official education partner of Perpetua Resources,” said CWI President Gordon Jones. “This partnership expands hands-on learning and workforce opportunities for our students, while also supporting the economic vitality of Idaho. By working together, we are preparing Idahoans for essential careers and ensuring our communities thrive for generations to come.”

Idaho LAUNCH was created by Governor Little in 2023 to help Idaho students receive the training they needed to fill rewarding, well-paying jobs in the state. To date, nearly 11,000 Idaho graduating high school seniors and over 10,000 adults have taken advantage of LAUNCH grants.

During their visit, Secretary Chavez-DeRemer and Governor Little held a roundtable discussion with Perpetua Resources, project partners, and local education leaders to learn more about the opportunities mining is creating for Idahoans. Roundtable participants encouraged permitting reform to advance critical mining projects and pointed to LAUNCH as an essential program to advance Idaho’s workforce readiness.

Since her appointment as U.S. Secretary of Labor, Chavez-DeRemer has prioritized putting American workers first. As part of her “America at Work” listening tour, Secretary Chavez-DeRemer has traveled across the country to meet with American businesses and workers to identify the skills and training programs our country needs to power the economy. Her stop in Valley County, Idaho, demonstrates her ongoing commitment to understanding the labor needs of Idaho’s rural workforce and underscores how the Stibnite Gold Project can fuel the region’s economic success.

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

About Perpetua Resources and the Stibnite Gold Project

FORWARD-LOOKING INFORMATION

Investors should be aware that the Stibnite Gold Project’s designation as a Transparency Project does not imply endorsement of or support for the project by the federal government, or create a presumption that the Project will be approved, favorably reviewed by any agency, or receive federal funding. The designation of a project as a Transparency Project may be reconsidered based on updated information.

Chris Fogg 7/14/25 Chris Fogg 7/14/25

Perpetua Resources Announces Full Exercise of Option and Additional Proceeds of US$49 Million

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced today that, in connection with the Company’s previously announced upsized US$325 million public offering of 24,622,000 common shares at a price to the public of US$13.20 per Common Share (the “Offering”) and concurrent $100 million private placement of 7,575,757 Common Shares to Paulson & Co. Inc. (the “Private Placement”), National Bank of Canada Financial Markets and BMO Capital Markets have exercised in full their option (the “Option”) to purchase an additional 3,693,300 common shares (the “Common Shares”) for aggregate gross proceeds to the Company of approximately US$49 million, which brings the aggregate gross proceeds of the Offering and Private Placement to approximately US$474 million.

The Company intends to use the additional proceeds from the exercise of the Option, together with the proceeds of the Offering and the Private Placement, as part of the Company’s previously announced comprehensive financing package for the development of the Company’s Stibnite Gold Project (the “Project”).

No securities regulatory authority has either approved or disapproved the contents of this news release. This news release does not constitute an offer to sell or the solicitation of an offer to buy Common Shares, nor shall there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction..”

About Perpetua Resources and the Stibnite Gold Project

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS OR INFORMATION

Statements contained in this news release that are not historical facts are "forward-looking information" or "forward-looking statements" (collectively, "Forward-Looking Information") within the meaning of applicable Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes, but is not limited to, disclosure regarding the anticipated use of proceeds from the exercise of the Option, the Offering and Private Placement; the occurrence of the expected benefits from the anticipated use of proceeds from the Option, the Offering and Private Placement; the amount of potential debt financing available to the Company; the timing and potential outcome of any other discussions with governmental agencies; the anticipated timing of the issuance of certain state permits or a USFS notice to proceed; our ability to fully fund the construction of the Project and related financial assurance obligations; our ability to successfully implement and fund the Project; and the occurrence of the expected benefits from the Project, including providing a domestic source of antimony, national defense benefits, creation of jobs and environmental benefits. In certain cases, Forward-Looking Information can be identified by the use of words and phrases or variations of such words and phrases or statements such as "anticipate", "expect", "plan", "likely", "believe", "intend", "forecast", "project", "estimate", "potential", "could", "may", "will", "would" or "should". In preparing the Forward-Looking Information in this news release, Perpetua Resources has applied several material assumptions, including, but not limited to, assumptions that the Company’s proposed financing package will be sufficient to finance permitting, pre-construction and construction of the Project or that the company will be able to secure alternate financing if necessary; that the current exploration, development, environmental and other objectives concerning the Project can be achieved and that its other corporate activities will proceed as expected; that general business and economic conditions will not change in a materially adverse manner and that permitting and operations costs will not materially increase; and that we will be able to discharge our liabilities as they become due and continue as a going concern. Forward-Looking Information are based on certain material assumptions and involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Perpetua Resources to be materially different from any future results, performance or achievements expressed or implied by the Forward-Looking Information. Such risks and other factors include, among other things, risks related to unforeseen delays in the review and permitting process, including as a result of legal challenges to the ROD or other permits; risks related to opposition to the Project; risks related to increased or unexpected costs in operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all, as well as those factors discussed in Perpetua Resources' public filings with the SEC and its Canadian disclosure record. Although Perpetua Resources has attempted to identify important factors that could affect Perpetua Resources and may cause actual actions, events or results to differ materially from those described in Forward-Looking Information, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that Forward-Looking Information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on Forward-Looking Information. For further information on these and other risks and uncertainties that may affect the Company's business and liquidity, see the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company's filings with the SEC, which are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedarplus.com. Except as required by law, Perpetua Resources does not assume any obligation to release publicly any revisions to Forward-Looking Information contained in this news release to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Chris Fogg 6/26/25 Chris Fogg 6/26/25

Perpetua Resources Publishes 2024 Sustainability Report

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) released its 2024 Sustainability Report highlighting the Company’s key achievements and progress in advancing its environmental, social and governance (“ESG”) goals. The report, which is the Company’s 12th annual sustainability report, provides disclosure of ESG topics and aligns with the Sustainability Accounting Standards Board (“SASB”) reporting framework for the Metals and Mining Industry.

“This year’s sustainability report chronicles a period of significant progress for the Company, guided by our dedication to responsible stewardship and investment in the region we’re proud to call home,” said Jon Cherry, Perpetua Resources President and CEO. “A highlight of this past year was receiving our Final Environmental Impact Statement (“FEIS”) and a Draft Record of Decision (“ROD”) in September 2024, followed by receipt of a Final ROD in January 2025. These achievements propel us ever closer to bringing this important project online, allowing us to secure critical minerals for America’s national security and provide much-needed environmental reclamation to the historical Stibnite Mining District.”

2024 Sustainability Report Highlights:

154 months (12+ years) with no reportable spills
109 months with no lost time incidents
100 percent of employees participated in business integrity and compliance related training
Spent $19 million in legacy cleanup activities to improve water quality at site since 2021
Team members spent 1,204 hours serving the community
Spent $23.6 million in Idaho in 2024; more than $132 million since 2014

Perpetua Resources’ 2024 Sustainability Report provides an in-depth look at the Company’s sustainability achievements over the last year, as well as the Company’s efforts to provide the U.S. with a domestic source of the critical mineral antimony, develop one of the largest and highest-grade open pit gold mines in the country, and restore an abandoned brownfield site.

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

About Perpetua Resources and the Stibnite Gold Project

FORWARD-LOOKING INFORMATION

Chris Fogg 6/16/25 Chris Fogg 6/16/25

Perpetua Resources Announces Webinar to Provide Update on Successful Financing and Next Steps to Unlock Value at the Stibnite Gold Project

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) is pleased to announce that following the recent closing of its registered offering (the “Offering”) and private placement (the “Private Placement”) of common shares, it will host a webinar on Wednesday, June 18, 2025, at 9:30 AM Mountain Time (11:30 AM Eastern Time).

The webinar will feature John Paulson, Perpetua Resources’ largest shareholder, alongside the Company’s Chairman, Marcelo Kim, and members of the executive and project execution team to provide an overview of the recent financing and to discuss the Company’s go forward plans to develop the Stibnite Gold Project. The presentation will be followed by a question & answer session. Access to the webinar may be conducted via telephone through the dial-in information provided below.

“Following the successful closing of the Offering and the Private Placement as part of a comprehensive financing package for the development of the Project, and in connection with the Company’s previously announced application for up to US$2 billion in project financing submitted to the Export-Import Bank of the United States in May 2025, Perpetua Resources is well positioned to move forward with a deep bench of experienced leaders” said Jon Cherry, Perpetua CEO. “With federal permits issued and a clear financing solution outlined and well advanced, we believe Perpetua Resources can unlock significant value developing the world class Stibnite Gold Project.”

Webinar Details:

Title: “Perpetua Resources Unlocking the Stibnite Gold Project”
Date: Wednesday, June 18, 2025
Time: 9:30 AM MT / 11:30 AM ET
Registration Link: https://us02web.zoom.us/webinar/register/WN_yzvfQiozQj-gm28eglDgzA
Dial-in Number: +1 (253) 205-0468
Meeting ID: 810 9272 7871
Passcode: 129646

In addition to the live webinar, the webinar presentation will be available on Perpetua’s website at https://perpetuaresources.com/ under the “Webinars & Events” tab..

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

About Perpetua Resources and the Stibnite Gold Project

FORWARD-LOOKING INFORMATION

Investors should be aware that the EXIM Letter of Interest (“LOI”) is non-binding and conditional, and does not represent a financing commitment. A funding commitment, if any, is conditional upon successfully completing the due diligence and underwriting process, which may not be completed on the expected timeline, or at all. If the Company’s application is approved, there can be no assurance that the EXIM financing will be for the full amount indicated in the LOI or the increased amount requested in the application, or that the approved EXIM financing will be sufficient for the Company to commence construction of the Stibnite Gold Project (the “Project”). Further, release of funding under any such commitment would be subject to the satisfaction of certain conditions and covenants by the Company.

Statements contained in this news release that are not historical facts are "forward-looking information" or "forward-looking statements" (collectively, "Forward-Looking Information") within the meaning of applicable Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes, but is not limited to, our ability to fully fund the construction of the Project; our ability to successfully implement and fund the Project; and the occurrence of the expected benefits from the Project, including providing a domestic source of antimony, national defense benefits, creation of jobs and environmental benefits. In certain cases, Forward-Looking Information can be identified by the use of words and phrases or variations of such words and phrases or statements such as "anticipate", "expect", "plan", "likely", "believe", "intend", "forecast", "project", "estimate", "potential", "could", "may", "will", "would" or "should". In preparing the Forward-Looking Information in this news release, Perpetua Resources has applied several material assumptions, including, but not limited to, assumptions that the EXIM application will be reviewed and approved within the expected timeframe at the amount equal to or higher than the amount indicated in the LOI; that the Company will be able to satisfy the conditions to obtain a funding commitment from EXIM and to receive committed funds when needed; that the Company will be able to satisfy financial assurance requirements applicable under applicable federal and state law; that the Company’s proposed financing package will be sufficient to finance permitting, pre-construction and construction of the Project or that the company will be able to secure alternate financing if necessary; that the current exploration, development, environmental and other objectives concerning the Project can be achieved and that its other corporate activities will proceed as expected; that general business and economic conditions will not change in a materially adverse manner and that permitting and operations costs will not materially increase; and that we will be able to discharge our liabilities as they become due and continue as a going concern. Forward-Looking Information are based on certain material assumptions and involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Perpetua Resources to be materially different from any future results, performance or achievements expressed or implied by the Forward-Looking Information. Such risks and other factors include, among other things, risks related to delays in the EXIM application review process; risks related to unforeseen delays in the review and permitting process, including as a result of legal challenges to the ROD or other permits; risks related to opposition to the Project; risks related to increased or unexpected costs in operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all, as well as those factors discussed in Perpetua Resources' public filings with the SEC and its Canadian disclosure record. Although Perpetua Resources has attempted to identify important factors that could affect Perpetua Resources and may cause actual actions, events or results to differ materially from those described in Forward-Looking Information, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that Forward-Looking Information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on Forward-Looking Information. For further information on these and other risks and uncertainties that may affect the Company's business and liquidity, see the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company's filings with the SEC, which are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedarplus.com. Except as required by law, Perpetua Resources does not assume any obligation to release publicly any revisions to Forward-Looking Information contained in this news release to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Chris Fogg 6/16/25 Chris Fogg 6/16/25

Perpetua Resources Closes US$425 Million Financing as part of Comprehensive Financing Package for Stibnite Gold Project

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced today that it has closed its previously announced upsized US$325 million public offering of 24,622,000 common shares, no par value, of the Company (the “Common Shares”) at a price of US$13.20 per Common Share (the “Offering”). Concurrently with the closing of the Offering, the Company closed its US$100 million private placement of 7,575,757 Common Shares to Paulson & Co. Inc. (the “Private Placement”).

National Bank of Canada Financial Markets and BMO Capital Markets acted as joint lead bookrunning managers for the Offering. RBC Capital Markets and Cantor Fitzgerald & Co. acted as joint bookrunning managers, and B. Riley Securities, CIBC Capital Markets, H.C. Wainwright & Co., Roth Capital Partners and Scotiabank acted as co-managers for the Offering.

The Company intends to use the proceeds of the Offering and the Private Placement as part of a comprehensive financing package for the development of the Company’s Stibnite Gold Project (the “Project”) in conjunction with the previously announced application for up to US$2 billion in project financing submitted to the Export-Import Bank of the United States (“EXIM”) in May 2025. The Company intends to designate the proceeds of the Offering and the Private Placement toward equity requirements for the EXIM debt financing, with any additional funds intended to support exploration activities, working capital and general corporate purposes. EXIM’s due diligence on the Company’s application is ongoing and is conditional upon successfully completing the due diligence and underwriting process. If the due diligence process is successful, the Company anticipates closing the debt financing in 2026.

Together with the EXIM debt financing and royalty financing described below, if successfully completed in the amounts anticipated, the Company believes that the net proceeds from the Offering and the Private Placement will provide the Company with sufficient capital to fund the Project construction costs of US$2.2 billion, along with additional funds for a cost-over run account, debt service, working capital costs in excess of the Project capital costs and exploration activities.

In addition, the Company is in advanced discussions with potential partners for guarantees of the Company’s obligations under reclamation bonds or other financial instruments that the Company will be required to enter into to satisfy financial assurance requirements applicable under applicable federal and state law. The Company is seeking a US$155 million guarantee and indemnification of the Company’s obligations to surety providers in respect of reclamation bonds or other financial instruments, along with proceeds between US$200 million to US$250 million, in exchange for either a gold net smelter return (“NSR”) royalty not to exceed 3.9% or a gold stream. A royalty, if any, would be expected to provide for buy back of a portion of the royalty if certain conditions are met. The US$155 million guarantee and indemnification is anticipated to be sufficient to satisfy the aggregate obligations of the Company to provide construction phase financial assurance as required by regulatory authorizations from relevant agencies. Securing the financial assurance in this amount is expected to position the Company to receive the USFS notice to proceed under the approved plan of operation and satisfy the financial assurance conditions of various federal and state permits, allowing the Company commence construction later in 2025. The proposed royalty and financial assurance arrangement is expected to be formalized in summer 2025. Based on indications from the relevant agencies, the Company expects the remaining state permits required to commence construction to be issued by the relevant agencies in summer 2025.

MI 61-101 Disclosure

Paulson purchased 7,575,757 Common Shares under the Private Placement in partial exercise of its contractual participation right under the amended and restated investor rights agreement dated March 17, 2020, among Paulson, Idaho Gold Resources Company, LLC (a subsidiary of the Company) and the Company. The Private Placement constituted a “related party transaction” under Multilateral Instrument 61-101 Protection of Minority Security Holders in Special Transactions (“MI 61-101”). The Company relied on exemptions from the formal valuation and minority shareholder approval requirements of MI 61-101 pursuant to subsections 5.5(a) and 5.7(1)(a) thereunder. Prior to the Offering, Paulson held 24,771,542 Common Shares, representing approximately 35% of the outstanding Common Shares of the Company. Following completion of the Offering and Private Placement, Paulson beneficially owns 32,347,299 Common Shares, representing approximately 31% of the Company’s outstanding Common Shares. The material change report in respect of the Private Placement will not be filed more than 21 days prior to the closing of the Private Placement due to timing of the announcement of the Offering and Private Placement and the closing of such transactions occurring within less than 21 days thereafter.

About Perpetua Resources and the Stibnite Gold Project

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS OR INFORMATION

Investors should be aware that the EXIM Letter of Interest (“LOI”) is non-binding and conditional, and does not represent a financing commitment. A funding commitment, if any, is conditional upon successfully completing the due diligence and underwriting process, which may not be completed on the expected timeline, or at all. If the Company’s application is approved, there can be no assurance that the EXIM financing will be for the full amount indicated in the LOI or the increased amount requested in the application, or that the approved EXIM financing will be sufficient for the Company to commence construction of the Project. Further, release of funding under any such commitment would be subject to the satisfaction of certain conditions and covenants by the Company.

Investors should be aware that the Company has not entered into any definitive agreement with respect to a royalty, streaming or guarantee and may not be able to enter into such agreement on the anticipated terms and timeline, or at all. In addition, the outcomes from such agreement, when entered into, may not be sufficient to satisfy the aggregate obligations of the Company to provide construction phase financial assurance under applicable federal and state law prior to commencing construction. Securing the financial assurance does not guarantee the Company will receive the USFS notice to proceed under the approved plan of operation and consummating the royalty financing may not satisfy the financial assurance conditions of various federal and state permits required to commence construction. Further, a buy back of a portion of the royalty would be subject to the satisfaction of certain conditions and covenants by the Company under the royalty and financing arrangement.

Investors should be aware that state regulators are not bound by permitting schedules and anticipated timelines may be delayed materially or not be satisfied.

Statements contained in this news release that are not historical facts are "forward-looking information" or "forward-looking statements" (collectively, "Forward-Looking Information") within the meaning of applicable Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes, but is not limited to, disclosure regarding the granting of the Underwriters’ over-allotment option; the anticipated use of proceeds from the Offering and Private Placement; the occurrence of the expected benefits from the anticipated use of proceeds from the Offering, Private Placement, EXIM financing and royalty financing disclosure regarding the review process, anticipated timing and potential outcome of the Company’s EXIM financing application; the amount of potential debt financing available to the Company; the eligibility of the Project for funding under the MMIA and CTEP initiatives; the timing and potential outcome of any other discussions with governmental agencies; the status and anticipated terms and timing of the royalty, streaming and financial assurance negotiations; the estimate of the initial financial assurance obligations; the anticipated timing of the issuance of certain state permits or a USFS notice to proceed; our ability to fully fund the construction of the Project and related financial assurance obligations; our ability to successfully implement and fund the Project; and the occurrence of the expected benefits from the Project, including providing a domestic source of antimony, national defense benefits, creation of jobs and environmental benefits. In certain cases, Forward-Looking Information can be identified by the use of words and phrases or variations of such words and phrases or statements such as "anticipate", "expect", "plan", "likely", "believe", "intend", "forecast", "project", "estimate", "potential", "could", "may", "will", "would" or "should". In preparing the Forward-Looking Information in this news release, Perpetua Resources has applied several material assumptions, including, but not limited to, assumptions that the EXIM application will be reviewed and approved within the expected timeframe at the amount equal to or higher than the amount indicated in the LOI; that the Company will be able to satisfy the conditions to obtain a funding commitment from EXIM and to receive committed funds when needed; the ongoing royalty financing negotiations will proceed in a timely manner and result in a binding agreement on the terms anticipated; that the Company will be able to satisfy financial assurance requirements applicable under applicable federal and state law; that the Company’s proposed financing package will be sufficient to finance permitting, pre-construction and construction of the Project or that the company will be able to secure alternate financing if necessary; that the current exploration, development, environmental and other objectives concerning the Project can be achieved and that its other corporate activities will proceed as expected; that general business and economic conditions will not change in a materially adverse manner and that permitting and operations costs will not materially increase; and that we will be able to discharge our liabilities as they become due and continue as a going concern. Forward-Looking Information are based on certain material assumptions and involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Perpetua Resources to be materially different from any future results, performance or achievements expressed or implied by the Forward-Looking Information. Such risks and other factors include, among other things, risks related to delays in the EXIM application review process; any approved amount of EXIM financing may not be sufficient to commence construction of the Project; the terms of the guarantee agreement and related surety agreements may not be sufficient to satisfy financial assurance requirements applicable under applicable federal and state law; risks related to unforeseen delays in the review and permitting process, including as a result of legal challenges to the ROD or other permits; risks related to opposition to the Project; risks related to increased or unexpected costs in operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all, as well as those factors discussed in Perpetua Resources' public filings with the SEC and its Canadian disclosure record. Although Perpetua Resources has attempted to identify important factors that could affect Perpetua Resources and may cause actual actions, events or results to differ materially from those described in Forward-Looking Information, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that Forward-Looking Information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on Forward-Looking Information. For further information on these and other risks and uncertainties that may affect the Company's business and liquidity, see the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company's filings with the SEC, which are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedarplus.com. Except as required by law, Perpetua Resources does not assume any obligation to release publicly any revisions to Forward-Looking Information contained in this news release to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Chris Fogg 6/12/25 Chris Fogg 6/12/25

Perpetua Resources Announces Upsizing of Previously Announced Bought Deal Public Offering of Common Shares

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced today that as a result of excess demand, it has agreed with the syndicate of underwriters led by National Bank of Canada Financial Markets and BMO Capital Markets, on behalf of themselves and a syndicate of underwriters (the “Underwriters”) to increase the size of its previously announced bought deal financing. Perpetua Resources will now issue 24,622,000 common shares, no par value, of the Company (the “Common Shares”) at a price of US$13.20 per Common Share (the “Offering Price”) for aggregate gross proceeds of approximately US$325 million (the “Offering”). National Bank of Canada Financial Markets and BMO Capital Markets are acting as joint lead bookrunning managers for the Offering. In connection with the Offering, Paulson & Co. Inc. has entered into an agreement to purchase US$100 million of Common Shares in a private placement (the “Private Placement”) at the Offering Price.

Perpetua Resources has also granted the Underwriters an option (the "Option") to purchase up to an additional 3,693,300 Common Shares representing up to 15% of the number of Common Shares to be sold pursuant to the Offering. The Underwriters have 30 days from the closing of the Offering to exercise the Option. In connection with the Offering, an underwriting agreement has been entered into by and among Perpetua Resources, National Bank of Canada Financial Markets and BMO Capital Markets as representatives of the several Underwriters (the "Underwriting Agreement"). In the event that the Option is exercised in full, the aggregate gross proceeds of the Offering will be approximately US$374 million.

The Offering to the public in the United States is being made pursuant to the Company’s effective shelf registration statement on Form S-3 (File No. 333-266071) (the “U.S. Registration Statement”), including a base prospectus, previously filed with the Securities and Exchange Commission (the "SEC"). The Offering in the United States will be made only by means of a prospectus and related prospectus supplement meeting the requirements of Section 10 of the Securities Act of 1933, as amended. You may obtain these documents for free by visiting EDGAR on the SEC's website at www.sec.gov. Alternatively, copies of the U.S. Registration Statement, preliminary prospectus supplement and base prospectus may be obtained from National Bank of Canada Financial Markets, 130 King Street West, 4th Floor Podium, Toronto, Ontario M5X 1J9, by email at NBF-Syndication@bnc.ca or by telephone at (416) 869-8414. The Offering may also be conducted in Canada and in offshore jurisdictions on a private placement basis in accordance with applicable securities laws. The Company intends to rely on the exemption in section 602.1 of the TSX Company Manual in respect of the Offering and the Private Placement as an eligible interlisted issuer.

The Private Placement is expected to close concurrently with the closing of the Offering and is subject to customary conditions, including the completion of the Offering, but the Offering is not contingent upon the consummation of the Private Placement. The sale of the Common Shares under the Private Placement will not be registered under the Securities Act of 1933, as amended. Since neither the fair market value of the Common Shares to be acquired by the Paulson (an insider of the Company), nor the consideration for the Common Shares paid by Paulson, exceeds 25% of the Company’s market capitalization as calculated in accordance with MI 61-101 (as defined below), the Private Placement is exempt from the formal valuation and minority approval requirements of Multilateral Instrument 61-101 - Protection of Minority Security Holders in Special Transactions (“MI 61-101”) pursuant to subsections 5.5(a) and 5.7(1)(a) of MI 61-101.

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

Website: www.perpetuaresources.com

About Perpetua Resources and the Stibnite Gold Project

Cautionary Statement Regarding Forward-Looking Statements or Information

Investors should be aware that the EXIM Letter of Interest (“LOI”) is non-binding and conditional, and does not represent a financing commitment. A funding commitment, if any, is conditional upon successfully completing the due diligence and underwriting process, which may not be completed on the expected timeline, or at all. If the Company’s application is approved, there can be no assurance that the EXIM financing will be for the full amount indicated in the LOI or the increased amount requested in the application, or that the approved EXIM financing will be sufficient for the Company to commence construction of the Project. Further, release of funding under any such commitment would be subject to the satisfaction of certain conditions and covenants by the Company.

Statements contained in this news release that are not historical facts are "forward-looking information" or "forward-looking statements" (collectively, "Forward-Looking Information") within the meaning of applicable Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes, but is not limited to, disclosure regarding the conduct of the Offering and Private Placement; the granting of the Underwriters’ over-allotment option; the anticipated use of proceeds from the Offering and Private Placement; the occurrence of the expected benefits from the anticipated use of proceeds from the Offering, Private Placement, EXIM financing and royalty financingdisclosure regarding the review process, anticipated timing and potential outcome of the Company’s EXIM financing application; the amount of potential debt financing available to the Company; the eligibility of the Project for funding under the MMIA and CTEP initiatives; our ability to fully fund the construction of the Project and related financial assurance obligations; our ability to successfully implement and fund the Project; and the occurrence of the expected benefits from the Project, including providing a domestic source of antimony, national defense benefits, creation of jobs and environmental benefits. In certain cases, Forward-Looking Information can be identified by the use of words and phrases or variations of such words and phrases or statements such as "anticipate", "expect", "plan", "likely", "believe", "intend", "forecast", "project", "estimate", "potential", "could", "may", "will", "would" or "should". In preparing the Forward-Looking Information in this news release, Perpetua Resources has applied several material assumptions, including, but not limited to, assumptions that the EXIM application will be reviewed and approved within the expected timeframe at the amount equal to or higher than the amount indicated in the LOI; that the Company will be able to satisfy the conditions to obtain a funding commitment from EXIM and to receive committed funds when needed; general business and economic conditions will not change in a materially adverse manner and that permitting and operations costs will not materially increase; and that we will be able to discharge our liabilities as they become due and continue as a going concern. Forward-Looking Information are based on certain material assumptions and involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Perpetua Resources to be materially different from any future results, performance or achievements expressed or implied by the Forward-Looking Information. Such risks and other factors include, among other things, risks related to delays in the EXIM application review process; any approved amount of EXIM financing may not be sufficient to commence construction of the Project; risks related to unforeseen delays in the review and permitting process, including as a result of legal challenges to the ROD or other permits; risks related to opposition to the Project; risks related to increased or unexpected costs in operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all, as well as those factors discussed in Perpetua Resources' public filings with the SEC and its Canadian disclosure record. Although Perpetua Resources has attempted to identify important factors that could affect Perpetua Resources and may cause actual actions, events or results to differ materially from those described in Forward-Looking Information, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that Forward-Looking Information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on Forward-Looking Information. For further information on these and other risks and uncertainties that may affect the Company's business and liquidity, see the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company's filings with the SEC, which are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedarplus.com. Except as required by law, Perpetua Resources does not assume any obligation to release publicly any revisions to Forward-Looking Information contained in this news release to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Chris Fogg 6/11/25 Chris Fogg 6/11/25

Perpetua Resources Announces US$300 Million Bought Deal Financing and US$100 Million Private Placement as part of Comprehensive Financing Package for Stibnite Gold Project

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced today that it has entered into an agreement with National Bank of Canada Financial Markets and BMO Capital Markets, on behalf of themselves and a syndicate of underwriters (the “Underwriters”) under which the Underwriters have agreed to purchase, on a bought deal basis, 22,728,000 common shares, no par value, of the Company (the “Common Shares”) at a price of US$13.20 per Common Share (the “Offering Price”) for aggregate gross proceeds of approximately US$300 million (the “Offering”). National Bank of Canada Financial Markets and BMO Capital Markets are acting as joint lead bookrunning managers for the Offering. In connection with the Offering, Paulson & Co. Inc. has entered into an agreement to purchase US$100 million of Common Shares in a private placement (the “Private Placement”) at the Offering Price.

Perpetua Resources has also granted the Underwriters an option (the "Option") to purchase up to an additional 3,409,200 Common Shares representing up to 15% of the number of Common Shares to be sold pursuant to the Offering. The Underwriters have 30 days from the closing of the Offering to exercise the Option. In connection with the Offering, an underwriting agreement will be entered into by and among Perpetua Resources, National Bank of Canada Financial Markets and BMO Capital Markets as representatives of the several Underwriters (the "Underwriting Agreement"). In the event that the Option is exercised in full, the aggregate gross proceeds of the Offering will be approximately US$345 million.

The Offering is expected to close on or about June 16, 2025. Closing of the Offering will be subject to a number of customary conditions to be included in the Underwriting Agreement.

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

Website: www.perpetuaresources.com

About Perpetua Resources and the Stibnite Gold Project

Cautionary Statement Regarding Forward-Looking Statements or Information

Investors should be aware that the EXIM Letter of Interest (“LOI”) is non-binding and conditional, and does not represent a financing commitment. A funding commitment, if any, is conditional upon successfully completing the due diligence and underwriting process, which may not be completed on the expected timeline, or at all. If the Company’s application is approved, there can be no assurance that the EXIM financing will be for the full amount indicated in the LOI or the increased amount requested in the application, or that the approved EXIM financing will be sufficient for the Company to commence construction of the Project. Further, release of funding under any such commitment would be subject to the satisfaction of certain conditions and covenants by the Company.

Investors should be aware that the Company has not entered into any definitive agreement with respect to a royalty, streaming or guarantee and may not be able to enter into such agreement on the anticipated terms and timeline, or at all. In addition, the outcomes from such agreement, when entered into, may not be sufficient to satisfy the aggregate obligations of the Company to provide construction phase financial assurance under applicable federal and state law prior to commencing construction. Securing the financial assurance does not guarantee the Company will receive the USFS notice to proceed under the approved plan of operation and consummating the royalty financing may not satisfy the financial assurance conditions of various federal and state permits required to commence construction. Further, a buy back of a portion of the royalty would be subject to the satisfaction of certain conditions and covenants by the Company under the royalty and financing arrangement.

Investors should be aware that state regulators are not bound by permitting schedules and anticipated timelines may be delayed materially or not be satisfied.

Statements contained in this news release that are not historical facts are "forward-looking information" or "forward-looking statements" (collectively, "Forward-Looking Information") within the meaning of applicable Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes, but is not limited to, disclosure regarding the conduct of the Offering and Private Placement; the granting of the Underwriters’ over-allotment option; the anticipated use of proceeds from the Offering and Private Placement; the occurrence of the expected benefits from the anticipated use of proceeds from the Offering, Private Placement, EXIM financing and royalty financing disclosure regarding the review process, anticipated timing and potential outcome of the Company’s EXIM financing application; the amount of potential debt financing available to the Company; the eligibility of the Project for funding under the MMIA and CTEP initiatives; the timing and potential outcome of any other discussions with governmental agencies; the status and anticipated terms and timing of the royalty, streaming and financial assurance negotiations; the estimate of the initial financial assurance obligations; the anticipated timing of the issuance of certain state permits or a USFS notice to proceed; our ability to fully fund the construction of the Project and related financial assurance obligations; our ability to successfully implement and fund the Project; and the occurrence of the expected benefits from the Project, including providing a domestic source of antimony, national defense benefits, creation of jobs and environmental benefits. In certain cases, Forward-Looking Information can be identified by the use of words and phrases or variations of such words and phrases or statements such as "anticipate", "expect", "plan", "likely", "believe", "intend", "forecast", "project", "estimate", "potential", "could", "may", "will", "would" or "should". In preparing the Forward-Looking Information in this news release, Perpetua Resources has applied several material assumptions, including, but not limited to, assumptions that the EXIM application will be reviewed and approved within the expected timeframe at the amount equal to or higher than the amount indicated in the LOI; that the Company will be able to satisfy the conditions to obtain a funding commitment from EXIM and to receive committed funds when needed; the ongoing royalty financing negotiations will proceed in a timely manner and result in a binding agreement on the terms anticipated; that the Company will be able to satisfy financial assurance requirements applicable under applicable federal and state law; that the Company’s proposed financing package will be sufficient to finance permitting, pre-construction and construction of the Project or that the company will be able to secure alternate financing if necessary; that the current exploration, development, environmental and other objectives concerning the Project can be achieved and that its other corporate activities will proceed as expected; that general business and economic conditions will not change in a materially adverse manner and that permitting and operations costs will not materially increase; and that we will be able to discharge our liabilities as they become due and continue as a going concern. Forward-Looking Information are based on certain material assumptions and involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Perpetua Resources to be materially different from any future results, performance or achievements expressed or implied by the Forward-Looking Information. Such risks and other factors include, among other things, risks related to delays in the EXIM application review process; any approved amount of EXIM financing may not be sufficient to commence construction of the Project; the terms of the guarantee agreement and related surety agreements may not be sufficient to satisfy financial assurance requirements applicable under applicable federal and state law; risks related to unforeseen delays in the review and permitting process, including as a result of legal challenges to the ROD or other permits; risks related to opposition to the Project; risks related to increased or unexpected costs in operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all, as well as those factors discussed in Perpetua Resources' public filings with the SEC and its Canadian disclosure record. Although Perpetua Resources has attempted to identify important factors that could affect Perpetua Resources and may cause actual actions, events or results to differ materially from those described in Forward-Looking Information, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that Forward-Looking Information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on Forward-Looking Information. For further information on these and other risks and uncertainties that may affect the Company's business and liquidity, see the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company's filings with the SEC, which are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedarplus.com. Except as required by law, Perpetua Resources does not assume any obligation to release publicly any revisions to Forward-Looking Information contained in this news release to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Chris Fogg 5/28/25 Chris Fogg 5/28/25

Perpetua Resources Awarded up to $6.9 Million in Defense Funding to Further Advance a Fully Domestic Antimony Trisulfide Supply Chain

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) today announced that it has been awarded up to $6.9 million in additional funding from the U.S. Army via the Defense Ordnance Technology Consortium (“DOTC”). The funding builds on the $15.5 million awarded to the Company by DOTC under an Ordnance Technology Initiative Agreement (“OTIA”) in August 2023. The funds are being applied to testing intended to demonstrate the feasibility of using material sourced from Perpetua’s Stibnite Gold Project (“Project”) to produce military-specification antimony trisulfide, a critical component in certain munitions and advanced defense systems. The OTIA is intended to fund the development and delivery of a flexible, modular pilot plant to the U.S. Army to process antimony and other materials of Department of Defense interest. The additional funding is intended to enable Perpetua to expand material sampling and to increase the scope and size of the flexible, modular pilot plant that was contemplated under the original OTIA.

“We are honored to continue our work with the U.S. Army to secure a domestic source of antimony trisulfide,” said Jon Cherry, President and CEO of Perpetua Resources. “Advancing America’s capabilities to process minerals critical to national defense is essential for our long-term mineral independence and resilience. We are proud to play our part in furthering the Army’s “ground-to-round” critical minerals strategy.”

This award is part of a broader partnership between Perpetua Resources and the Department of Defense to secure domestic sources of critical minerals. In 2023, as part of the OTIA, Perpetua received an award worth up to $15.5 million through the DOTC program to demonstrate a fully domestic antimony trisulfide supply chain. This supplemental award allows the Company to expand the research already in progress under the OTIA and support the U.S. Army’s objective of establishing a fully domestic “ground-to-round” antimony trisulfide supply chain. With the receipt of this latest additional funding, Perpetua has now been awarded, in the aggregate, more than $80 million by the Department of Defense.

“Antimony trisulfide is an essential and non-replaceable component to over 300 types of munitions, making it important to source in America. Establishing a fully domestic supply chain of this critical mineral is foundational to keeping America’s warfighters safe,” said Colonel Steven Power, Project Manager, Maneuver Ammunition Systems (PM MAS) at the Picatinny Arsenal.

Under the OTIA, Perpetua will be reimbursed for these activities on a cost-plus fixed fee basis over the period of performance, which was extended through the end of calendar year 2026 in connection with the additional award. The aggregate total funding amount of up to $22.4 million under the OTIA is subject to adjustment by DOTC based on scope, costs, budget, or other factors as the program advances. Perpetua will be entitled to reimbursement for all costs incurred under the agreement.

The Project, which is expected to supply up to 35 percent of U.S. antimony demand during its first six years of operations based on the 2023 USGS antimony commodity summary, represents a crucial step toward restoring American supply chain resilience. In 2024, China, which controls the majority of the global antimony market, cut off antimony exports to the United States. In addition to providing for American national security, the Project is designed to create hundreds of family-wage jobs, restore fish access to critical spawning habitat, address legacy environmental contamination, and improve water quality at an historical abandoned mine site.

About the Department of Defense Ordnance Technology Consortium:

The DOTC serves as the focal point for armaments system technology research and development. The industrial and academic component of DOTC is the National Armaments Consortium (“NAC”), which consists of over 1,000 companies.

DOTC’s mission, in partnership with NAC, is to enhance our warfighters’ lethality, survivability and combat effectiveness by facilitating the industrial and academic research, development and technology demonstrations needed to advance and expand our military technological superiority. DOTC is sponsored by the Office of the Secretary of Defense and is utilized by all Services and Defense Agencies to design, develop and demonstrate prototypes for armaments. NAC is the largest collaborative organization working with the DoD to develop armament technologies in support of our nation’s security.

The NAC is comprised of our nation’s leading technologists, engineers, designers, scientists, manufacturers, and program managers across industry, academia and our nation’s laboratories, all with the mission to develop armaments that give the U.S. a technological edge over our enemies. Together, DOTC offers government customers a better way of doing business through streamlined acquisition and collaboration across a broad spectrum of industrial and academic partners.

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

Website: www.perpetuaresources.com

About Perpetua Resources and the Stibnite Gold Project

Perpetua Resources Corp., through its wholly owned subsidiaries, is focused on the exploration, site restoration and redevelopment of gold-antimony-silver deposits in the Stibnite-Yellow Pine district of central Idaho that are encompassed by the Stibnite Gold Project. The Project is one of the highest-grade, open pit gold deposits in the United States and is designed to apply a modern, responsible mining approach to restore an abandoned mine site and produce both gold and the only mined source of antimony in the United States. Perpetua Resources has been awarded a Technology Investment Agreement (“TIA”) of $59.2 million in Defense Production Act Title III (“DPA”) funding to advance construction readiness and permitting of the Project. Antimony trisulfide from Stibnite is the only known domestic source of antimony that can meet U.S. defense needs for many small arms, munitions, and missile types. In addition to the company’s commitments to transparency, accountability, environmental stewardship, safety and community engagement, Perpetua Resources adopted formal ESG commitments which can be found here.

Forward-Looking Information

Statements contained in this news release that are not historical facts are "forward-looking information" or "forward-looking statements" (collectively, "Forward-Looking Information") within the meaning of applicable Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes, but is not limited to, the outcomes of future material sampling conducted by the Company and adjustments to the modular pilot plant design and construction; the amount and timing of any approval of reimbursement requests under the TIA and OTIA; our ability to successfully implement and fund the Project; and the occurrence of the expected benefits from the Project, including creation of jobs and environmental benefits. Statements concerning mineral resource and mineral reserve estimates may also be deemed to constitute forward-looking information to the extent that such statements involve estimates of the mineralization that may be encountered if a property is developed. In certain cases, Forward-Looking Information can be identified by the use of words and phrases or variations of such words and phrases or statements such as "anticipate", "expect", "plan", "likely", "believe", "intend", "forecast", "project", "estimate", "potential", "could", "may", "will", "would" or "should". In preparing the Forward-Looking Information in this news release, Perpetua Resources has applied several material assumptions, including, but not limited to, assumptions that that the full amounts of the additional funding from the DOTC will be funded within a reasonable timeframe; we will be able to successfully secure financing to finance permitting, pre-construction and construction of the Project; that the current exploration, development, environmental and other objectives concerning the Project can be achieved and that its other corporate activities will proceed as expected; that general business and economic conditions will not change in a materially adverse manner and that permitting and operations costs will not materially increase; and that we will be able to discharge our liabilities as they become due and continue as a going concern. Forward-Looking Information are based on certain material assumptions and involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Perpetua Resources to be materially different from any future results, performance or achievements expressed or implied by the Forward-Looking Information. Such risks and other factors include, among other things, risks related to unforeseen delays in the review and permitting process, including as a result of legal challenges to the ROD or other permits; risks related to opposition to the Project; risks related to increased or unexpected costs in operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all, as well as those factors discussed in Perpetua Resources' public filings with the U.S. Securities and Exchange Commission (the "SEC") and its Canadian disclosure record. Although Perpetua Resources has attempted to identify important factors that could affect Perpetua Resources and may cause actual actions, events or results to differ materially from those described in Forward-Looking Information, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that Forward-Looking Information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on Forward-Looking Information. For further information on these and other risks and uncertainties that may affect the Company's business and liquidity, see the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company's filings with the SEC, which are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedar.com. Except as required by law, Perpetua Resources does not assume any obligation to release publicly any revisions to Forward-Looking Information contained in this news release to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

DISTRIBUTION STATEMENT A: Approved for public release; distribution unlimited. PAO Log# 514-25, 21 May 2025

Chris Fogg 5/23/25 Chris Fogg 5/23/25

Perpetua Resources Submits Formal Application to Export-Import Bank of the United States to Finance the Stibnite Gold Project

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Submission follows receipt of final federal permit.

Application submitted for up to $2 billion, an increase from the $1.8 billion Letter of Interest, reflecting a higher estimated number of job-years.

If approved, EXIM debt financing could fund a majority of the Project’s development costs to become the only domestically mined source of antimony.

BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced that it submitted its formal application to the Export-Import Bank of the United States (“EXIM”) for potential debt financing of up to $2 billion to construct the Stibnite Gold Project (the “Project”). Upon receipt of Perpetua’s application, EXIM is expected to conduct its standard due diligence consistent with EXIM’s policies and legal requirements, and to review the Project’s eligibility under the relevant initiatives.

Perpetua’s formal application follows extensive ongoing engagement with EXIM’s underwriting team and receipt of the final federal permit for the Project. EXIM extended a non-binding Letter of Interest (“LOI”) to Perpetua in April 2024 for potential debt financing up to $1.8 billion through EXIM’s “Make More in America” (“MMIA”) initiative and “China and Transformational Exports Program” (“CTEP”). The increase in the application amount to $2 billion from the $1.8 billion LOI reflects the increase in the estimated number of job-years indicated by the financial update and basic engineering work completed in the first quarter of 2025. The application comes on the heels of the recent Executive Order aimed at increasing government financing available for mineral production.

“The Stibnite Gold Project is poised to be a national strategic asset for domestic antimony production and is also a world class gold asset. EXIM financing could play a pivotal role in advancing the Project to production so we can reestablish a secure supply of antimony for the United States for decades to come," said Jon Cherry, President and CEO of Perpetua Resources.

If approved, EXIM debt financing could fund a majority of the Project’s development costs and help the United States more effectively compete with China. In 2024, the People’s Republic of China blocked the global export of antimony, effectively cutting off the United States and the rest of the world from this critical mineral that is essential to national defense. The Stibnite Gold Project offers a near-term solution to bringing antimony production back to the United States, while simultaneously producing gold and providing environmental restoration to the historical Stibnite Mining District.

Earlier this month, Perpetua received its final federal permit, the Clean Water Act Section 404 permit, from the U.S. Army Corps of Engineers, marking the culmination of eight years of interagency federal permitting. With receipt of this Army Corps permit, along with previous authorizations from the U.S. Forest Service and agencies of the State of Idaho, the Company is focused on obtaining its few remaining state permits and securing financing to commence construction.

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

Website: www.perpetuaresources.com

About Perpetua Resources and the Stibnite Gold Project

Forward-Looking Information and Cautionary Note

Investors should be aware that the EXIM Letter of Interest is non-binding and conditional, and does not represent a financing commitment. A funding commitment, if any, is conditional upon successfully completing the due diligence and underwriting process, which may not be completed on the expected timeline, or at all. If the Company’s application is approved, there can be no assurance that the EXIM financing will be for the full amount indicated in the LOI or the increased amount requested in the application, or that the approved EXIM financing will be sufficient for the Company to commence construction of the Project. Further, release of funding under any such commitment would be subject to the satisfaction of certain conditions and covenants by the Company.

Statements contained in this news release that are not historical facts are "forward-looking information" or "forward-looking statements" (collectively, "Forward-Looking Information") within the meaning of applicable Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes, but is not limited to, disclosure regarding the review process and potential outcome of the Company’s EXIM financing application; the amount of potential debt financing available to the Company; the eligibility of the Project for funding under the MMIA and CTEP initiatives; our ability to successfully implement and fund the Project; and the occurrence of the expected benefits from the Project, including providing a domestic source of antimony, national defense benefits, creation of jobs and environmental benefits. In certain cases, Forward-Looking Information can be identified by the use of words and phrases or variations of such words and phrases or statements such as "anticipate", "expect", "plan", "likely", "believe", "intend", "forecast", "project", "estimate", "potential", "could", "may", "will", "would" or "should". In preparing the Forward-Looking Information in this news release, Perpetua Resources has applied several material assumptions, including, but not limited to, assumptions that the EXIM application will be reviewed and approved within the expected timeframe at the amount equal to or higher than the amount indicated in the LOI; that the Company will be able to satisfy the conditions to obtain a funding commitment from EXIM and to receive committed funds when needed; the Company will be able to successfully secure financing to finance permitting, pre-construction and construction of the Project; that the current exploration, development, environmental and other objectives concerning the Project can be achieved and that its other corporate activities will proceed as expected; that general business and economic conditions will not change in a materially adverse manner and that permitting, construction and operations costs will not materially increase; and that we will be able to discharge our liabilities as they become due and continue as a going concern. Forward-Looking Information are based on certain material assumptions and involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Perpetua Resources to be materially different from any future results, performance or achievements expressed or implied by the Forward-Looking Information. Such risks and other factors include, among other things, risks related to delays in the EXIM application review process; any approved amount of EXIM financing may not be sufficient to commence construction of the Project; risks related to opposition to the Project, including legal challenges to the ROD or other permits; risks related to increased or unexpected costs in construction, operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all, as well as those factors discussed in Perpetua Resources' public filings with the U.S. Securities and Exchange Commission (the "SEC") and its Canadian disclosure record. Although Perpetua Resources has attempted to identify important factors that could affect Perpetua Resources and may cause actual actions, events or results to differ materially from those described in Forward-Looking Information, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that Forward-Looking Information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on Forward-Looking Information. For further information on these and other risks and uncertainties that may affect the Company's business and liquidity, see the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company's filings with the SEC, which are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedar.com. Except as required by law, Perpetua Resources does not assume any obligation to release publicly any revisions to Forward-Looking Information contained in this news release to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Chris Fogg 5/19/25 Chris Fogg 5/19/25

Perpetua Resources Receives Final Federal Permit for Stibnite Gold Project

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U.S. Army Corps of Engineers issues Section 404 Clean Water Act (“CWA”) Permit for Stibnite Gold Project

CWA permit is the final federal permit needed to advance construction decision

Project poised to supply the only domestically produced source of antimony and is designed to provide national security, environmental, and community benefits

BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) today announced that the United States Army Corps of Engineers ("Army Corps" or “USACE”) has issued Perpetua’s Clean Water Act Section 404 permit for the Stibnite Gold Project (the "Project"). This decision comes after eight years of rigorous interagency federal permitting, and was the last federal permit required to progress towards construction. With receipt of this permit, Perpetua Resources is focused on finalizing the remaining state permits and securing project financing needed to begin construction.

"Today’s final federal permit from the Army Corps marks the culmination of eight years of permitting, scientific study, project refinement, and lots of hard work," said Jon Cherry, President and CEO of Perpetua Resources. “We are immensely proud to achieve this milestone. It’s time to move forward and take the Stibnite Gold Project into a new and exciting phase of development."

The Stibnite Gold Project is positioned to deliver significant environmental and economic benefits to rural Idaho while enhancing U.S. national security. It is expected to bring significant investment and create an average of approximately 550 jobs in the region during operations. The Project is projected to be one of the highest-grade open-pit gold mines in the United States, with gold reserves of approximately 4.8 million ounces, and is expected to produce approximately 450,000 ounces of gold annually over its first four years of production. Additionally, the Project holds an estimated 148-million-pound antimony reserve — the only identified antimony reserve in the U.S. and one of the largest reserves outside of Chinese control. It is estimated the Project could meet about 35% of U.S. antimony demand during its initial six years of production, based on the 2023 USGS antimony commodity summary. Antimony is classified as a critical mineral essential for technology, defense, and energy applications. In late 2024, China, which accounts for nearly half of global antimony production, cut off global antimony exports, including to the United States. Developing a domestic source of antimony through the Stibnite Gold Project can help bolster America’s strategic mineral security and independence.

The Stibnite Gold Project is designed to redevelop the historical Stibnite Mining District for gold, silver and antimony, while conducting environmental restoration to rehabilitate the abandoned site. Perpetua’s vision to “Restore the Site” is a central tenet of the approved mine plan. The Project is designed to:

Remove, reprocess, and safely store legacy tailings and waste to improve water quality;
Restore the natural flow of the headwaters of the Salmon River and reopen fish passage to miles of critical spawning habitat that have been blocked for over 80 years;
Provide a net increase in wetland acres and an uplift in wetlands quality.

Perpetua Resources began the formal permitting process under the National Environmental Policy Act (“NEPA”) in 2016. As the lead permitting agency, the U.S. Forest Service issued a Draft Environmental Impact Statement in 2020, a Supplemental Draft Environmental Impact Statement in 2022, a Final Environmental Impact Statement and Draft Record of Decision in September of 2024, and a Final Record of Decision in January 2025. During the public comment periods, over 23,000 letters were submitted supporting the Project.

In April 2025, the Stibnite Gold Project was selected by the Trump Administration as a Transparency Project in response to President Donald Trump’s March 2025 Executive Order to bolster American mineral production and was included on the Federal Permitting Improvement Steering Council (“Permitting Council”) FAST-41 dashboard. The FAST-41 Transparency Projects dashboard is designed to enhance interagency accountability and transparency for review of projects selected by the Permitting Council under the March 2025 Executive Order.

“As we celebrate receiving the final federal permit for the Stibnite Gold Project, we applaud the National Energy Dominance Council and the Permitting Council’s efforts to streamline permitting and propel critical mining projects nationwide,” Cherry continued. “We believe this administration’s commitment to boosting efficiency without compromising rigorous environmental standards can have a transformational impact on American mining."

As a cooperating agency, the U.S. Army Corps has been involved in the interagency permitting review of the Stibnite Gold Project since 2017. It began formally evaluating Perpetua Resources’ Section 404 Clean Water Act permit application in 2023. The permit was delivered on time and in accordance with the Army Corps’ anticipated Q2 2025 decision timetable and the timeline set forth on the FAST-41 dashboard.

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

Website: www.perpetuaresources.com

About Perpetua Resources and the Stibnite Gold Project

Forward-Looking Information

Investors should be aware that the Project’s inclusion as a Transparency Project on the Permitting Dashboard does not imply endorsement of or support for the project by the federal government, or create a presumption that the Project will be approved, favorably reviewed by any agency, or receive federal funding. The inclusion of a project on the Permitting Dashboard may be reconsidered based on updated information. Additionally, investors should be aware that the Executive Order does not indicate any commitments on the part of the government or any government agency with regard to the applicability of any programs to the Project, or the timing or outcome of any such initiative that may be applicable to the Project.

Statements contained in this news release that are not historical facts are "forward-looking information" or "forward-looking statements" (collectively, "Forward-Looking Information") within the meaning of applicable Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes, but is not limited to, the anticipated outcomes from the Executive Order and the Transparency Projects list for the Company or the mining industry; our ability to comply with, obtain and defend permits related to the Project; our ability to successfully implement and fund the Project; and the occurrence of the expected benefits from the Project, including creation of jobs and environmental benefits. Statements concerning mineral resource and mineral reserve estimates may also be deemed to constitute forward-looking information to the extent that such statements involve estimates of the mineralization that may be encountered if a property is developed. In certain cases, Forward-Looking Information can be identified by the use of words and phrases or variations of such words and phrases or statements such as "anticipate", "expect", "plan", "likely", "believe", "intend", "forecast", "project", "estimate", "potential", "could", "may", "will", "would" or "should". In preparing the Forward-Looking Information in this news release, Perpetua Resources has applied several material assumptions, including, but not limited to, assumptions that that the remaining state permits will be reviewed, issued in a timely manner and as expected; that the initiatives outlined in the Executive Order, and the intended goals of the Transparency Projects list, will be implemented as proposed; that we will be able to successfully secure financing to finance permitting, pre-construction and construction of the Project; that the current exploration, development, environmental and other objectives concerning the Project can be achieved and that its other corporate activities will proceed as expected; that general business and economic conditions will not change in a materially adverse manner and that permitting and operations costs will not materially increase; and that we will be able to discharge our liabilities as they become due and continue as a going concern. Forward-Looking Information are based on certain material assumptions and involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Perpetua Resources to be materially different from any future results, performance or achievements expressed or implied by the Forward-Looking Information. Such risks and other factors include, among other things, risks related to unforeseen delays in the review and permitting process, including as a result of legal challenges to the ROD or other permits; risks related to opposition to the Project; risks related to increased or unexpected costs in operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all, as well as those factors discussed in Perpetua Resources' public filings with the U.S. Securities and Exchange Commission (the "SEC") and its Canadian disclosure record. Although Perpetua Resources has attempted to identify important factors that could affect Perpetua Resources and may cause actual actions, events or results to differ materially from those described in Forward-Looking Information, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that Forward-Looking Information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on Forward-Looking Information. For further information on these and other risks and uncertainties that may affect the Company's business and liquidity, see the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company's filings with the SEC, which are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedar.com. Except as required by law, Perpetua Resources does not assume any obligation to release publicly any revisions to Forward-Looking Information contained in this news release to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Cautionary Statement Regarding Reserve and Technical Information

Chris Fogg 5/16/25 Chris Fogg 5/16/25

Perpetua Resources Reports Results of 2025 Annual Meeting

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Chris Fogg 5/12/25 Chris Fogg 5/12/25

Perpetua Resources Announces First Quarter 2025 and Recent Highlights

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced today that its unaudited condensed consolidated financial results for the period ended March 31, 2025 were filed. For details, please see the Company’s filings available on EDGAR and SEDAR.

Perpetua Resources’ vision is to provide the U.S. with a domestic source of the critical mineral antimony, develop one of the largest and highest-grade open pit gold mines in the country and restore an abandoned brownfield site. Perpetua Resources is focused on advancing the Stibnite Gold Project (“Stibnite Gold Project” or “Project”) towards a construction decision, including finalizing the remaining federal and state permits and securing project financing.

First Quarter 2025 and Recent Highlights:

Zero lost time incidents or reportable environmental spills.
USFS issued the Final Record of Decision (“ROD”) for the Project.
Successful completion of basic engineering and cost update for the Project.
Executed procurement contract with Idaho Power for critical long-lead power line items.
Added to the Market Vectors Junior Gold Miners Index and the VanEck Junior Gold Miners ETF.
Welcomed Executive Order to strengthen American mineral production and reduce U.S. reliance on foreign nations for its mineral supply.
Announced Stibnite Gold Project was selected as a priority project by the White House.

“Perpetua Resources began 2025 with the biggest milestone in the company’s history – a favorable Final Record of Decision for the Stibnite Gold Project,” said Jon Cherry, President and CEO of Perpetua Resources. "In April 2025, our project was selected as a Transparency Project by the White House, which I believe underscores the immense strategic value of our asset to our country. Importantly, we completed the first quarter safely, with no lost time incidents or reportable spills.”

For further information about Perpetua Resources Corp., please contact:

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Info@perpetuacorp.us

Mckinsey Lyon

Vice President External Affairs

media@perpetua.us

Website: www.perpetuaresources.com

About Perpetua Resources and the Stibnite Gold Project

Perpetua Resources Corp., through its wholly owned subsidiaries, is focused on the exploration, site restoration and redevelopment of gold-antimony-silver deposits in the Stibnite-Yellow Pine district of central Idaho that are encompassed by the Stibnite Gold Project. The Project is one of the highest-grade, open pit gold deposits in the United States and is designed to apply a modern, responsible mining approach to restore an abandoned mine site and produce both gold and the only mined source of antimony in the United States. Further advancing Perpetua Resources’ ESG and sustainable mining goals, the Project will be powered by one of the lowest carbon emissions grids in the nation and a portion of the antimony produced from the Project will be supplied to Ambri, a U.S.-based company commercializing a low-cost liquid metal battery essential for the low-carbon energy transition. Perpetua Resources has been awarded a TIA of $59.2 million in DPA funding to advance construction readiness and permitting of the Project. Antimony trisulfide from Stibnite is the only known domestic source of antimony that can meet U.S. defense needs for many small arms, munitions, and missile types. In addition to the company’s commitments to transparency, accountability, environmental stewardship, safety and community engagement, Perpetua Resources adopted formal ESG commitments which can be found here.

Forward-Looking Information and Cautionary Note

Statements contained in this news release that are not historical facts are "forward-looking information" or "forward-looking statements" (collectively, "Forward-Looking Information") within the meaning of applicable Canadian securities legislation and the United States Private Securities Litigation Reform Act of 1995. Forward-Looking Information includes, but is not limited to, disclosure regarding possible events, next steps and courses of action; the anticipated outcomes from the Executive Order and the Transparency Projects list for the Company or the mining industry; our ability to comply with, obtain and defend permits related to the Project; our ability to successfully implement and fund the Project and the occurrence of the expected benefits from the Project; and our and Ambri Inc.'s ability to perform under the supply agreement. In certain cases, Forward-Looking Information can be identified by the use of words and phrases or variations of such words and phrases or statements such as "anticipate", "expect", "plan", "likely", "believe", "intend", "forecast", "project", "estimate", "potential", "could", "may", "will", "would" or "should". In preparing the Forward-Looking Information in this news release, Perpetua Resources has applied several material assumptions, including, but not limited to, assumptions that that the remaining permits will be reviewed, issued in a timely manner and as expected; that the initiatives outlined in the Executive Order, and the intended goals of the Transparency Projects list, will be implemented as proposed; that we will be able to successfully secure financing to finance permitting, pre-construction and construction of the Project; that the current exploration, development, environmental and other objectives concerning the Project can be achieved and that its other corporate activities will proceed as expected; that general business and economic conditions will not change in a materially adverse manner and that permitting and operations costs will not materially increase; and that we will be able to discharge our liabilities as they become due and continue as a going concern. Forward-Looking Information are based on certain material assumptions and involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Perpetua Resources to be materially different from any future results, performance or achievements expressed or implied by the Forward-Looking Information. Such risks and other factors include, among other things, risks related to unforeseen delays in the review and permitting process, including as a result of legal challenges to the ROD or other permits; risks related to opposition to the Project; risks related to increased or unexpected costs in operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all, as well as those factors discussed in Perpetua Resources' public filings with the U.S. Securities and Exchange Commission (the "SEC") and its Canadian disclosure record. Although Perpetua Resources has attempted to identify important factors that could affect Perpetua Resources and may cause actual actions, events or results to differ materially from those described in Forward-Looking Information, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that Forward-Looking Information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on Forward-Looking Information. For further information on these and other risks and uncertainties that may affect the Company's business and liquidity, see the "Risk Factors" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of the Company's filings with the SEC, which are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedar.com. Except as required by law, Perpetua Resources does not assume any obligation to release publicly any revisions to Forward-Looking Information contained in this news release to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

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