Press Releases

Chris Fogg 6/23/26 Chris Fogg 6/23/26

Perpetua Resources Publishes 2025 Sustainability Report

BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) released its 2025 Sustainability Report highlighting the Company’s key achievements and progress in advancing its environmental, social and governance (“ESG”) goals. The 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.

“Our 2025 Sustainability Report reflects a milestone year for Perpetua Resources,” said Jon Cherry, President and CEO of Perpetua Resources. “After years of environmental review, stakeholder engagement, and technical development, we secured our final federal permits and began early works construction activities at the Stibnite Gold Project. Reaching this point was made possible by a long-standing commitment to safety, responsible development, and meaningful partnership with our stakeholders. As we move into construction, our sustainability commitments are more important than ever. They will continue to guide our work as we help supply the critical minerals America needs, restore a historic mining district and create lasting benefits for local communities."

2025 Sustainability Report Highlights:

166 months (13+ years) with no reportable spills
121 months (10+ years) with no lost time incidents
100 percent of employees participated in business integrity and compliance related training
Provided 590 hours of volunteer service to the community
Finalized a cultural monitoring agreement with the Shoshone Paiute Tribes
Posted approximately $159.6 million in construction phase Financial Assurance
Contributed $63.4 million to Idaho’s economy in 2025
Completed $19+ million in legacy cleanup to improve water quality at site since 2021
Fulfilled $450,000 milestone payment to the Stibnite Foundation and 150,000 company shares representing $3.75 million at a share value of $25 / share
Established a $250,000 Stibnite Launch Scholarship Fund with the College of Western Idaho

Perpetua’s 2025 SustainabilityReportprovides 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 mine site.

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

Joe Fazzini, CA, CPA, CFA

Vice President, Investor Relations

Joe.Fazzini@perpetuacorp.us

Info@perpetuacorp.us

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Mckinsey Lyon

Senior 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. The Stibnite Gold Project is one of the highest grade, open pit gold deposits in the United States and holds the only identified domestic reserve of the critical mineral antimony, which is essential to the defense, energy, and manufacturing sectors. The Project is designed to apply a modern, responsible mining approach to restore an abandoned mine site and provide uplift to water quality, improve fish habitat access, and invest in river restoration while supporting local economic development in rural Idaho.

Forward-Looking Statements

Information and statements contained in this report 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. We use words such as “may,” “would,” “could,” “should,” “will,” “expect,” “anticipate,” “believe,” “intend,” “plan,” “potential”, “estimate” and similar expressions suggesting future outcomes or events to identify forward-looking statements or forward-looking information. Forward-Looking Information includes, but is not limited to, information concerning the business of Perpetua Resources Corp. (the “Company”); the Stibnite Gold Project (the “Project”), including but not limited to, certain assumptions that the U.S. EXIM financing application will close and fund within the expected timeframe; that the Company’s proposed financing will be successful and 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; timing of anticipated milestones related to the Project and financing; our ability to comply with, obtain and defend permits related to the Project; the expected outcomes of the Project, including our mineral reserves and mineral resources; environmental cleanup actions by us and our contractors; ongoing funding and anticipated liquidity; our ability to comply with permits related to the Stibnite Gold Project; timing of anticipated milestones related to the Project; the realization of benefits from strategic partnerships, including the partnership with Idaho National Laboratory; planned exploration and development of properties and the results thereof; success of environmental protection, closure and remediation activities; predictions regarding improvements to water quality, water temperature, and fish habitats and other environmental conditions at the site, including with respect to process and timing of such improvements; reduction of the Project footprint and the anticipated benefits and other effects thereof; our ability to successfully implement the Project and the occurrence of the expected benefits from the Project, including contributions to the workforce, national security and clean energy transition; ESG-related goals, strategies, priorities and initiatives, including, among others, those related to GHG emissions, waste and hazardous materials management, habitat and biodiversity, health, safety and wellbeing, labor practices and human rights; the anticipated economic, environmental and other benefits of the Project; the viability of the Project; development and operating costs in the event that a production decision is made; success of exploration, development and environmental protection, closure and remediation activities; risks and opportunities associated with the Project; the timing and results of future exploration and material sampling by the Company, including with respect to antimony and tungsten; anticipated timing and results of ongoing engineering and contracting activities; plans for the design and construction of the Project; the viability of the Project; expected construction, development and operating costs in the event that a final construction decision is made; and development of any additional resources and reserves and the permitting requirements with respect to any such additional resources and reserves. Statements concerning mineral resource and mineral reserve estimates may also constitute Forward-Looking Information to the extent that they involve estimates of the mineralization that may be encountered if the Project is developed. In preparing the Forward-Looking Information herein, the Company has applied several material assumptions, including, but not limited to, assumptions underlying the basic engineering work; that the U.S. Export-Import Bank’s financing application will close and fund within the expected timeframe; that the Company’s proposed financing will be successful and 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 no pending or future litigation will result in the loss of any material permits or material delay to the Project schedule or a material increase to Project costs; that we will be able to obtain sufficient funding to finance preconstruction and construction of the Project and that all requisite information will be available in a timely manner; 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 the current price and demand for gold and antimony will be sustained or will improve; that general business and economic conditions will not change in a materially adverse manner and that all necessary governmental approvals for planned activities on the Project will be obtained in a timely manner and on acceptable terms; that permitting, construction and operations costs will not materially increase; the continuity of the price of gold, antimony and other metals, economic and political conditions and operations; and the assumptions set out in the Company’s reports filed with the SEC. Forward-Looking Information involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company 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 others, delays in the negotiation, and closing of the U.S. EXIM loan or material changes to the terms of the loan; delays in, or inability to satisfy the conditions to signing, closing or funding of the U.S. EXIM loan, if approved; 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 development, construction, operations or the permitting process; risks that necessary financing will be unavailable when needed on acceptable terms, or at all; the industry-wide risks and project-specific risks identified in the Company’s reports filed with the SEC; operations and contractual obligations; changes in exploration programs based upon results of exploration; changes in estimated mineral reserves or mineral resources; future prices of metals and minerals; availability of personnel and equipment; equipment failure; accidents, effects of weather and other natural phenomena and other risks associated with the mineral exploration industry; environmental risks, including environmental matters under US federal and Idaho rules and regulations; impact of environmental remediation requirements and the terms of existing and potential consent decrees on the Company’s planned exploration and development activities on the Project, physical and transition risks associated with climate change, increased attention to ESG-related matters, risks related to our public statements with respect to such matters that may be subject to heightened scrutiny from public and governmental authorities related to the risk of potential “greenwashing,” (i.e., misleading information or false claims overstating potential sustainability related benefits); certainty of mineral title; community relations; delays in obtaining governmental approvals or financing; the Company’s dependence on one mineral project; the nature of mineral exploration and mining and the uncertain commercial viability; the Company’s lack of operating revenues; governmental regulations and the ability to obtain necessary licenses and permits; risks related to prior unregistered agreements, transfers or claims and other defects in title to mineral projects; currency fluctuations; changes in environmental laws and regulations and changes in the application of standards pursuant to existing laws and regulations; risks related to dependence on key personnel; risks to employee health and safety and a slowdown or temporary suspension of operations in geographic locations impacted by an outbreak of disease; estimates used in budgeting and financial statements proving to be incorrect; 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; risks related to the outcome of litigation and potential for delay of the Project, as well as those factors discussed in the Company’s public disclosure record. Although the Company has attempted to identify important factors that could affect the Company 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. Because it is not possible to predict or identify all such factors, this list cannot be considered a complete set of all potential risks or uncertainties. 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, are available at www.sec.gov and with the Canadian securities regulators, which are available at www.sedarplus.com. Except as required by law, the Company expressly disclaims any obligation to update the Forward-Looking Information herein.

Cautionary Statement Regarding Technical Information

The technical information in respect of the Stibnite Gold Project in this report is based upon information contained in the technical report titled “Stibnite Gold Project, S-K 1300 Technical Report Summary, Valley County, Idaho, USA,” dated as of December 31, 2025 (the “TRS”), developed for the Stibnite Gold Project in accordance with the mining property disclosure rules specified in Regulation S-K subpart 1300 (“S-K 1300”) promulgated by the SEC and published on March 31, 2026. Such information is as of December 31, 2025, and is subject to the assumptions, exclusions and qualifications set forth in the TRS. For additional information regarding the TRS, investors are encouraged to refer to the Company’s Annual Report on Form 10-K for the year ended December 31, 2025, filed with the SEC on March 31, 2026. Data regarding domestic antimony reserves based on U.S. Geological Survey, Mineral Commodity Summaries, dated as of January 2026.

Guest User 6/5/26 Guest User 6/5/26

Perpetua Resources Reports Results of 2026 Annual Meeting

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) today announced the results of its annual general meeting (the “Annual Meeting”), which was held online through a virtual meeting platform on June 4, 2026.

A total of 100,523,482 common shares were represented at the Annual Meeting, or 80.35% of the votes attached to all outstanding shares at the Company’s record date of April 8, 2026. The Company’s shareholders voted for the election of all director nominees listed in the Company’s management information proxy circular. Detailed results of the vote for the election of directors are as follows:

  
    

    Name of Nominee
    Votes For
    Votes Witheld
    Abstentions
    Total Votes*
    Percentage of Votes For*
    Percentage of Votes Witheld*
    Percentage of Votes Abstained*
  


    Marcelo Kim
    75,595,988
    11,973,401
    135,148
    84,569,389
    85.84%
    14.16%
    0.16%
  

    Christopher Robison
    82,656,825
    1,912,537
    121,876
    84,569,389
    97.74%
    2.26%
    0.14%
  

    Alexander Sternhell
    84,171,419
    397,970
    74,346
    84,569,389
    99.53%
    0.47%
    0.09%
  

    Robert Dean
    83,609,269
    960,120
    69,990
    84,569,389
    98.86%
    1.14%
    0.08%
  

    Andrew Cole
    84,259,071
    310,318
    65,930
    84,569,389
    99.63%
    0.37%
    0.08%
  

    Richie Haddock
    83,611,367
    958,022
    72,973
    84,569,389
    98.87%
    1.13%
    0.09%
  

    Laura Dove
    83,776,106
    793,283
    83,193
    84,569,389
    99.06%
    0.94%
    0.10%
  

    Jeff Malmen
    84,286,363
    283,026
    64,781
    84,569,389
    99.67%
    0.33%
    0.08%
  

    Jon Cherry
    84,410,663
    158,726
    64,753
    84,569,389
    99.81%
    0.19%
    0.08%
  


  
  

* Not all shares were voted in respect of all resolutions therefore the combined number of shares voted for or withheld (and corresponding percentages) may not add up to the total shares represented at the Annual Meeting.

The directors were elected to hold offices until the next annual meeting of shareholders or until their respective successors are elected and qualified. The Company’s shareholders also approved setting the number of directors at nine (99.73% voted in favor).

The Company’s shareholders also ratified the appointment of PricewaterhouseCoopers LLP, Chartered Accountants, as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026 at a remuneration to be set by the directors (99.84% voted in favor, 0.05% voted against, and 0.11% abstained).

The proposal to approve the Company’s 2026 Equity Incentive Plan was also approved by shareholders (98.93% voted in favor).

Detailed voting results for the meeting will be available on EDGAR at www.sec.com.

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

Joe Fazzini, CA, CPA, CFA

Vice President, Investor Relations

Joe.Fazzini@perpetuacorp.us

Info@perpetuacorp.us

Chris Fogg

Investor Relations Manager

chris.fogg@perpetuacorp.us

Mckinsey Lyon

Senior Vice President External Affairs

media@perpetua.us

Website: www.perpetuaresources.com

About Perpetua Resources and the Stibnite Gold Project

Chris Fogg 6/1/26 Chris Fogg 6/1/26

Perpetua Resources Advances Construction of the Stibnite Gold Project

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Construction ramps up as Idaho Federal Court rejects efforts to stop critical path activities

Company commences Burntlog Route construction

Critical-path activities target on-time delivery of antimony for U.S. defense interests

BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced today that the Stibnite Gold Project (“Project”) continues to advance previously planned critical path construction and infrastructure activities following the May 29 decision by the United States District Court of Idaho denying the Project opponents’ motion for a preliminary injunction related to a lawsuit filed in 2025 by special interest groups. In the decision, the Court found that the Plaintiffs failed to show that the planned activities would cause the Plaintiffs irreparable harm.

On Saturday, May 30, Perpetua commenced additional critical path construction activities for the 2026 field season, including initial work associated with the Burntlog Route, a key infrastructure project designed to support safe and efficient access to the Project site while minimizing impacts to nearby communities and sensitive environmental areas. These road upgrades will continue in parallel with additional planned construction of on-site worker housing facilities, selected powerline upgrades, and approved exploration and geotechnical drilling. This new activity builds upon the early works construction Perpetua began in October 2025 and is focused on maintaining construction schedule for 2029 operations and delivery of urgently needed antimony to the United States military.

**Perpetua crews begin construction of Burntlog Route, May 30, 2026**

“We are focused on responsibly advancing the Project and executing on the important work ahead of us,” said Jon Cherry, President and CEO of Perpetua Resources. “This construction season is narrow and important to advance major infrastructure for the on-time delivery of antimony to support demand from the U.S. military. We also are pleased to continue with important environmental restoration and our commitment to economic development in Idaho.”

The Stibnite Gold Project is designed to redevelop and rehabilitate the abandoned Stibnite mining district, which was largely mined for antimony and tungsten during World War II and the Korean War. The approved project includes extensive environmental restoration measures intended to improve water quality, remove legacy mine waste, reconnect fish habitat, and restore streams and wetlands within the Project area.

Following years of evaluation of alternatives and study of potential environmental impacts, the U.S. Forest Service identified the Burntlog Route as the preferred access road after determining it provides safer travel, limits proximity to sensitive water ways, and reduces impacts on the environment and residents and recreationalists. Perpetua has also placed financial assurances approved by federal and state agencies to ensure reclamation of construction-related impacts.

The U.S. Department of War has identified the Stibnite Gold Project as the only U.S. mine that would be capable of producing antimony volumes sufficient to meet defense demand by 2029. Antimony from the Stibnite Gold Project also provides a domestic source to support growing commercial demand for antimony. Perpetua’s planned construction activities for this construction season target critical items that must be completed in order to keep development on track to commence gold and antimony production in 2029.

In preparation for the summer construction season, Perpetua Resources has engaged local contractors and service providers to support initial construction activities. These contracts represent approximately $45 million in direct work expected for businesses and communities across Idaho.

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

Joe Fazzini

Vice President, Investor Relations

joe.fazzini@perpetuacorp.us

info@perpetuacorp.us

Chris Fogg

Investor Relations Manager

chris.fogg@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 United States District Court’s decision denying the motion for a preliminary injunction is not a final decision on the ongoing lawsuit filed by the plaintiffs in this case and the decision could be appealed.

Information and 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. We use words such as “may,” “would,” “could,” “should,” “will,” “likely,” “expect,” “anticipate,” “believe,” “intend,” “plan,” “potential,” “forecast,” “outlook,” “project,” “estimate” and similar expressions suggesting future outcomes or events to identify forward-looking statements or forward-looking information. Forward-Looking Information includes, but is not limited to, disclosure regarding timing of anticipated milestones related to the Project and financing; our ability to comply with, obtain and defend permits related to the Project; the expected outcomes of the Project, including our mineral reserves and mineral resources; the expected defense and commercial demand for antimony and the Company’s ability to supply it; 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, contributions to national security, creation of jobs as well as environmental and economic benefits.

Forward-Looking Information involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company 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 others, 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 development, 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 the Company’s public filings with the U.S. Securities and Exchange Commission (the “SEC”) and its Canadian disclosure record. Although the Company has attempted to identify important factors that could affect the Company 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. Because it is not possible to predict or identify all such factors, this list cannot be considered a complete set of all potential risks or uncertainties. 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, the Company expressly disclaims any obligation to update the Forward-Looking Information herein.

Chris Fogg 5/21/26 Chris Fogg 5/21/26

Export Import Bank of the United States Approves $2.9 Billion Loan for Development of Perpetua Resources’ Stibnite Gold Project

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Landmark loan under EXIM’s Make More in America Initiative supports domestic critical mineral supply chain and hundreds of jobs in rural Idaho

Stibnite Gold Project is poised to develop the only domestic reserve of critical mineral antimony

$2.9 billion loan, combined with Perpetua’s cash on hand, is expected to fully fund estimated capital costs for the construction of the Stibnite Gold Project

BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced today that the Board of the Export-Import Bank of the United States (“EXIM”) has unanimously approved a $2.9 billion senior secured long-term loan (“Loan”) under the Make More in America Initiative (“MMIA”) to support the development of Perpetua’s Stibnite Gold Project (“Stibnite” or “Project”). EXIM’s approval comes after extensive technical, financial, environmental and social due diligence and a 25-day notice period to Congress.

"It is time to make more in America and today marks not only a key milestone for Perpetua Resources, but a significant step in mineral security for our country,” said Jon Cherry, President and CEO of Perpetua Resources. “When the federal government and private industry work together on a shared national priority, big things are made possible. The $2.9 billion loan positions us to bring the Stibnite Gold Project to life and signals a new day in American mineral independence and responsible mining. We are immensely proud of our role in strengthening America's national security, creating hundreds of jobs in rural Idaho, and reducing our dependence on foreign adversaries for a mineral we cannot do without.”

The Stibnite Gold Project is an ideal candidate for U.S. EXIM financing as it sits at the nexus of EXIM’s highest priority mandates – strengthening America’s industrial manufacturing supply chains, domestic job support, and critical mineral independence to advance both national security and domestic industrial and commercial manufacturing needs.

EXIM’s decision marks a landmark transaction under the MMIA Initiative and advances American production and manufacturing to be more competitive on the world stage. As the only identified domestic reserve of antimony, EXIM’s investment in the Project advances American critical mineral independence for antimony.

“Idaho’s abundant critical and rare earth minerals are essential to reducing U.S. dependence on foreign suppliers,” said U.S. Senator for Idaho James Risch. “This investment will help expand our domestic critical mineral supply, create high-quality jobs in rural America, and strengthen our national security.”

“This investment strengthens America’s economic and national security by advancing a reliable domestic supply of critical minerals essential to our manufacturing and defense industries,” said U.S. Senator for Idaho Mike Crapo. “The Export-Import Bank’s Make More in America initiative is helping secure the infrastructure needed to reduce our dependence on foreign adversaries, support American workers and reinforce our long-term industrial competitiveness. It is encouraging to see this effort moving forward in Idaho, where it has the potential to create hundreds of high-quality jobs, long-term economic competitiveness and supply chain security.”

The EXIM financing package, combined with Perpetua’s cash on hand, is expected to fully fund the direct construction of the Stibnite Gold Project based on the current capital cost estimates as reported in the Company’s Technical Report Summary as of December 31, 2025. Underpinned by robust economics from gold, the Stibnite Gold Project is designed to responsibly redevelop and restore the abandoned Stibnite Mining District in Idaho to produce gold and the nation’s only reported reserve of the critical mineral antimony. In doing so, the Project would provide investments in environmental cleanup of the historical site, secure a source of antimony for American commercial and defense manufacturing, and create an average of over 700 direct jobs a year over the life of the mine and significant tax revenue for local communities and the state of Idaho.

“There is no better place to deploy US EXIM’s $2.9 billion investment than right here in the heart of Idaho,” said Idaho Governor Brad Little. “The Stibnite Gold Project is exactly the kind of project America needs. It will create hundreds of family-wage jobs and break America’s dependence on our adversaries for the antimony our military and manufacturers need. Thank you to EXIM for this vote of confidence in the Gem State, and congratulations to Perpetua Resources on a milestone that strengthens Idaho and the nation.”

To date, the Stibnite Gold Project has gone through rigorous scientific and public review, was identified as a Transparency Project under the FAST-41 Program and has received substantial support and partnership from the Department of War. Today’s EXIM financing announcement illustrates a whole-of-government approach to advance this project towards production.

The Loan will be available upon completion of definitive documentation and satisfaction of customary conditions precedent, which is expected to occur in the second half of 2026. The Loan is to be structured as a 13-year senior secured credit facility of $2.9 billion, consisting of an upfront facility of $2.4 billion with the remainder to cover capitalized interest during construction and EXIM’s exposure fee. The increase in the principal amount of the Loan compared to the initial EXIM Board review primarily relates to adding an option to move certain planned equipment financing from a third-party financing company into the EXIM Loan.

Interest on the Loan is to be set at the applicable long-dated U.S. Treasury bond rate plus 100 basis points and will be fixed at the time of the first drawdown. Scheduled repayments are anticipated to commence in 2030.

The MMIA Initiative is a Congressionally authorized financing program through EXIM designed to help companies make more in America – especially in sectors critical to national security. The goal of the program is to help American producers obtain financing, compete on a global scale and, in the process, generate economic opportunities for hardworking Americans.

EXIM is an independent Executive Branch agency and the official export credit agency of the United States. EXIM’s mission is to support American jobs by facilitating the export of U.S. goods and services. In 2024, Perpetua Resources submitted a Letter of Interest application to EXIM. After EXIM expressed interest in potential debt financing, Perpetua worked on its application for more than a year, officially submitting it in May 2025. In September 2025, the Company received a preliminary project letter and indicative term sheet from EXIM for financing. Since that time, EXIM has conducted extensive due diligence and legal review, including its own environmental and social evaluation of the Project. The final approval from EXIM’s Board of Directors comes two years after the initial interest application was submitted and a year after Perpetua submitted its formal application.

Advisors

The Company’s transaction advisors for the Loan include Endeavour Financial acting as financial advisor, and Hunton Andrews Kurth LLP serving as legal counsel.

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

Joe Fazzini

Vice President, Investor Relations

joe.fazzini@perpetuacorp.us

info@perpetuacorp.us

Chris Fogg

Investor Relations Manager

chris.fogg@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 funding under the EXIM loan is subject to completion of definitive documentation and satisfaction of conditions precedent. There can be no assurance that we will be able to successfully negotiate definitive loan documents to close the loan or that, if closed, any funding provided by U.S. EXIM will be sufficient for us to construct the Project. Further, release of funding under the loan would be subject to the satisfaction of certain conditions and covenants by the Company.

Investors should be aware that the 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 receive federal funding. The designation of a project as a Transparency Project may be reconsidered based on updated information.

Information and 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. We use words such as “may,” “would,” “could,” “should,” “will,” “likely,” “expect,” “anticipate,” “believe,” “intend,” “plan,” “potential,” “forecast,” “outlook,” “project,” “estimate” and similar expressions suggesting future outcomes or events to identify forward-looking statements or forward-looking information. Forward-Looking Information includes, but is not limited to, disclosure regarding the, anticipated timing, documentation, closing and funding of the Company’s proposed U.S. EXIM financing and the final terms of the proposed U.S. EXIM financing; timing of anticipated milestones related to the Project and financing; ongoing funding and anticipated liquidity; our ability to comply with, obtain and defend permits related to the Project; the expected outcomes of the Project, including our mineral reserves and mineral resources; the expected commercial demand for antimony and the Company’s ability to supply it; our ability to successfully implement and fund the Project; the occurrence of the expected benefits from the Project, including contributions to national security; and timing of anticipated milestones related to the Project and financing.

In preparing the Forward-Looking Information herein, the Company has applied several material assumptions, including, but not limited to, certain assumptions that the U.S. EXIM financing application will close and fund within the expected timeframe; that the Company will be able to negotiate and execute definitive documentation for the proposed U.S. EXIM financing on acceptable terms, satisfy the conditions to signing, closing and funding of the U.S. EXIM loan and receive funds when needed; that the final terms of the proposed U.S. EXIM financing will be substantially consistent with those currently indicated; that the Company’s proposed financing 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 Company will be able to maintain compliance with covenants contained in its financing agreements or that may be contained in future financing agreements; that the Company will be able to satisfy additional bonding or financial assurance requirements in the future; that no pending or future litigation will result in the loss of any material permits or material delay to the Project schedule or a material increase to Project costs; that the current exploration, development, environmental and other objectives concerning the Project can be achieved and that the Company’s 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; that the Company will satisfy or will continue to satisfy the requirements of applicable permits and the requirements of various governmental approvals; and that the Company or applicable governmental agencies will be able to successfully defend against any challenges to governmental approvals for the planned exploration, construction, development, operation and environmental protection activities on the Project.

Forward-Looking Information involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company 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 others, delays in the closing of the U.S. EXIM loan or material changes to the anticipated size or terms of the loan; delays in, or inability to satisfy the conditions to signing, closing or funding of the U.S. EXIM loan; 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 development, 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 the Company’s public filings with the U.S. Securities and Exchange Commission (the “SEC”) and its Canadian disclosure record. Although the Company has attempted to identify important factors that could affect the Company 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. Because it is not possible to predict or identify all such factors, this list cannot be considered a complete set of all potential risks or uncertainties. 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, the Company expressly disclaims any obligation to update the Forward-Looking Information herein.

Cautionary Statement Regarding Technical Information

The technical 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, S-K 1300 Technical Report Summary, Valley County, Idaho, USA,” dated as of December 31, 2025 (the “TRS”), developed for the Stibnite Gold Project in accordance with the mining property disclosure rules specified in Regulation S-K subpart 1300 (“S-K 1300”) promulgated by the SEC and published on March 31, 2026. Such information is as of December 31, 2025 and is subject to the assumptions, exclusions and qualifications set forth in the TRS. For additional information regarding the TRS, investors are encouraged to refer to the Company’s Annual Report on Form 10-K for the year ended December 31, 2025, filed with the SEC on March 31, 2026. Data regarding domestic antimony reserves based on U.S. Geological Survey, Mineral Commodity Summaries, dated as of January 2026.

Chris Fogg 5/11/26 Chris Fogg 5/11/26

Perpetua Resources Announces First Quarter 2026 Financial Results

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced today the filing of its unaudited condensed consolidated financial results for the period ended March 31, 2026. 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 while developing one of the largest and highest-grade open pit gold mines in the Americas and restoring an abandoned brownfield site. The Company is currently advancing a comprehensive project financing plan along with detailed engineering, long-lead time procurement, early works construction activities and execution planning in anticipation of a final investment and construction decision in the second half of 2026.

“After breaking ground late last year at our Stibnite project, we maintained our momentum in Q1 2026,” said Jon Cherry, President and CEO of Perpetua Resources. “The first quarter saw considerable progress towards securing our comprehensive project financing plans with U.S EXIM and a final vote is expected in the coming weeks. Meanwhile, we significantly advanced detailed engineering, continued early works construction and began procurement for long-lead time items ahead of our Final Investment Decision expected in the second half of 2026.”

First Quarter 2026 and Recent Highlights

The U.S. Export-Import Bank ("U.S. EXIM") Board posted the Congressional notice for an approximately $2.7 billion proposed senior secured loan for the Project. The notification period has since expired, and U.S. EXIM's board has advanced the loan to a final vote anticipated in the second quarter of 2026.
The Company's loan has been placed on the agenda for the U.S. EXIM Board meeting on May 21, 2026, reflecting meaningful progress toward financing approval. The agenda is subject to change by the board of U.S. EXIM at any time, and there can be no assurance that the board will vote to approve the loan at the May 21 meeting, at a different meeting, or at all.
If approved, the loan is expected to consist of approximately $2.2 billion for construction of the Project, financial assurance, and certain discretionary corporate and exploration costs, with the remainder comprising capitalized interest and fees.
If approved by the U.S. EXIM Board in the amount indicated, the Company would have sufficient capital to fully finance the Project's estimated direct capital costs of $2,576 million — combining the U.S. EXIM loan with $669.5 million of cash on hand as of March 31, 2026 — as well as financial assurance and discretionary corporate and exploration costs, consistent with the capital expenditure estimate set forth in the December 31, 2025 Technical Report Summary ("TRS").
The Company maintained an exemplary safety and environmental record during the quarter, with zero lost time incidents and zero reportable environmental spills.
In March 2026, the Company published an updated TRS incorporating revised capital and operating expense estimates that reflect continued advancement in engineering, contracting, and Project development through December 2025. The TRS continued to demonstrate compelling project economics for the Stibnite Gold Project across a wide range of gold and antimony price assumptions.
In January 2026, the Company received the final remaining Stream Alteration Permit from the Idaho Department of Water Resources ("IDWR"), finalizing necessary state approvals for work in various streams and other water resources.
Also in January 2026, the Company received the final Idaho Pollutant Discharge Elimination System ("IPDES") permit for industrial wastewater discharges. This permit is currently subject to an automatic stay under Idaho law until an administrative appeal process is completed.
In April 2026, the Idaho Department of Environmental Quality (“IDEQ”) issued a final modified Clean Water Act Section 401 Water Quality Certification for the Project, advancing a key state water quality approval through a further stage of regulatory review. A contested case proceeding challenging certain aspects of the Certification remains pending, and a new hearing date has not yet been scheduled. The Certification remains valid during the pendency of the contested case proceeding.
The Company anticipates receipt of the second phase cyanidation permit from IDEQ in the second quarter of 2026, advancing regulatory approval of the Project's cyanidation facility. IDEQ released a draft of the second phase permit for public comment in February 2026.
Perpetua is aware that the environmental plaintiffs in the 2025 NEPA challenge in the U.S. District Court in Idaho on May 8, 2026, filed a motion for a preliminary injunction seeking to delay certain construction activities on federal land planned for the Stibnite Gold Project. The motion excludes the early works activities that Perpetua has been advancing under a prior stipulation agreed to by the Company and the plaintiffs, and those activities will continue. The hearing on the motion is set for May 28th, and a ruling is expected shortly thereafter.
The Company successfully transitioned its Engineering, Procurement, and Construction Management ("EPCM") responsibilities for the Project's processing plant and related scopes of work from Ausenco to Hatch, ensuring continuity and strengthening execution capacity as the Project advances toward construction.

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

Joe Fazzini

Vice President, Investor Relations

joe.fazzini@perpetuacorp.us

info@perpetuacorp.us

Chris Fogg

Investor Relations Manager

chris.fogg@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 funding under the EXIM loan is subject to approval by the EXIM board, completion of definitive documentation and satisfaction of conditions precedent. There can be no assurance that we will be able to successfully negotiate definitive loan documents to close the loan or that, if closed, any funding provided by U.S. EXIM will be sufficient for us to construct the Project. Further, release of funding under the loan 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 Company’s beliefs with respect to the outcome of the judicial hearing; the Company’s expected defense against the legal action taken by Project opponents; the continued advancement of the Project toward full construction activities; potential outcome of the Company’s proposed U.S. EXIM financing application and approval process; timing of anticipated milestones related to the Project and financing; ongoing funding and anticipated liquidity; the Company’s ability to comply with, obtain and defend permits related to the Project; the expected outcomes of the Project; the Company’s ability to successfully implement and fund the Project; and the occurrence of the expected benefits from the Project. 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 successfully defend against the legal action taken by Project opponents; that the judicial hearing will result in a favorable outcome for the Company; the Company’s proposed financing 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 Company will be able to maintain compliance with covenants contained in its financing agreements or that may be contained in future financing agreements; that the Company will be able to satisfy additional bonding or financial assurance requirements in the future; that no pending or future litigation will result in the loss of any material permits or material delay to the Project schedule or a material increase to Project costs; that the current exploration, development, environmental and other objectives concerning the Project can be achieved and that the Company’s 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; that the Company will satisfy or will continue to satisfy the requirements of applicable permits and the requirements of various governmental approvals; and that the Company or applicable governmental agencies will be able to successfully defend against any challenges to governmental approvals for the planned exploration, construction, development, operation and environmental protection activities on the Project. Forward-Looking Information 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, delays in the judicial hearing concerning the motion by Project opponents; adverse outcomes from such hearing, including the granting of the motion, in full or in part; the impacts or delays that an adverse outcome from such hearing may have on construction readiness and early works activities; delays in the review, negotiation, board approval and closing of the U.S. EXIM loan or material changes to the anticipated size or terms of the loan; delays in, or inability to satisfy the conditions to signing, closing or funding of the U.S. EXIM loan, if approved; 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 development, 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 the Company has attempted to identify important factors that could affect the Company 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. Because it is not possible to predict or identify all such factors, this list cannot be considered a complete set of all potential risks or uncertainties. 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.ca. Except as required by law, the Company expressly disclaims any obligation to update the Forward-Looking Information herein.

Cautionary Statement Regarding Technical Information

Chris Fogg 3/31/26 Chris Fogg 3/31/26

U.S. EXIM’s Board Advances Proposed $2.7 Billion Loan to Congressional Notice & Perpetua Announces Improved Project Economics

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Updated Project Economics demonstrate Stibnite as a premier gold-antimony asset with base case after-tax NPV5% of $3.5 billion at $3,250/oz gold, increasing to $6.1 billion NPV5% at $4,500/oz gold [1]

Cash balance of $714 million at year-end together with proposed $2.2 billion direct loan, if approved, would fund all estimated direct capital costs, ongoing exploration & corporate costs

BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) announced today the Board of the Export-Import Bank of the United States (“U.S. EXIM”) unanimously agreed to notify Congress of a proposed $2.7 billion senior secured long-term loan for development of Perpetua’s Stibnite Gold Project (“Stibnite” or “Project”). The proposed total comprises a direct loan of approximately $2.2 billion and the remainder for capitalized interest and fees. The proposed loan directly supports the goals and objectives of U.S. EXIM’s Make More in America (“MMIA”) program.

This decision triggers a 25-day notice period to Congress and is the last formal step before U.S. EXIM’s Board will vote on final approval, which Perpetua anticipates shortly after the notice period ends. If the proposed loan is approved, the Company would have sufficient capital, together with the $714 million of cash on hand at year end, to finance the estimated capital cost of $2,576 million to build the Project per the updated Technical Report Summary (“TRS”) as of December 31, 2025.[2]

“Today’s decision marks the final phase of EXIM approval,” said Jon Cherry, President & CEO of Perpetua Resources. “We’ve worked diligently with U.S. EXIM for over two years on a financing solution aimed at strengthening America’s supply chains, creating jobs right here at home, and fortifying national security. This puts Perpetua on track for a Final Investment Decision later this year. We are also pleased to publish updated project economics reflecting current commodity prices as well as capital and operating cost estimates as of the end of 2025. Assuming a $4,500/oz gold price, the updated model reports Stibnite’s unlevered, after-tax project NPV of $6.1 billion and after-tax IRR of 32.3% reaffirming Stibnite as a premier gold-antimony project.”

Perpetua advises the notification to Congress of the proposed loan does not represent a financing commitment from U.S. EXIM. A final funding commitment, if any, is conditional upon the satisfaction of certain conditions, including final approval by the U.S. EXIM Board following the notification period to Congress. The loan, if approved, is expected to be comprised of a direct loan of approximately $2.2 billion for construction of the Project, financial assurance and certain discretionary corporate and exploration costs, with the remainder representing capitalized interest and fees. Based on the Congressional review timeline and U.S. EXIM process, the Company anticipates a final vote on the loan by the Board of U.S. EXIM shortly after the notice period ends. Funding under the loan would be subject to finalization of definitive loan documents and satisfaction of all conditions to closing and drawdown, which the Company anticipates could occur in the second half of 2026.

[1] Net Present Value (NPV) is defined as the present value of future after-tax cash flows of the project discounted at an annual rate of 5%. All NPV calculations reflect antimony and silver pricing of $10/lb and $40/oz, respectively. Please refer to Technical Report Summary section below for additional information.

[2] TRS filed as exhibit 96.1 to the Company’s annual report on Form 10-K for the year ended December 31, 2025.

Technical Report Summary (TRS) Updated to December 31, 2025

In connection with the filing of the Company’s 2025 Annual Report on Form 10-K with the U.S. Securities Exchange Commission, Perpetua Resources published an updated TRS, which reflects current commodity pricing as well as capital and operating cost estimates for the Project as of December 31, 2025. The Company previously published a Technical Report Summary, dated as of December 31, 2021, and amended as of June 6, 2022 (the “2022 TRS”). The economic information in the 2022 TRS was supplemented by an updated cash flow model published by the Company on February 13, 2025 (“Financial Update”). The TRS updates and replaces, as of December 31, 2025, the 2022 TRS and Financial Update.

Since announcing the Financial Update in February 2025, Perpetua has advanced project engineering and has made significant progress in financing the future development of the Stibnite Gold Project. Key achievements include obtaining all permits to commence early-works construction, posting construction stage financial assurance with federal and state agencies, commencing early works construction in October 2025, welcoming significant new strategic investors (Agnico Eagle Mines Limited & JPMorganChase) and strengthening the Company’s management and operations team.

The most notable updates from the 2022 TRS and the Financial Update include the following:

The TRS incorporates engineering designs developed during the basic engineering phase completed in 2025, including design improvements to the mineral processing plant, site infrastructure, and tailings management. Perpetua estimates overall project engineering was approximately 45% complete as of December 31, 2025.
The TRS incorporates updates derived from recent and ongoing environmental baseline studies, permitting application submittals and authorizations, and other environmental compliance and regulatory activities. The study also integrates cost and technical data derived from signed contracts (including Hatch, ATCO) and active contract negotiations across construction, professional services, and capital equipment procurement as of December 31, 2025.
The TRS presents revised operating costs, capital costs, taxes and various long-term metal price assumptions based on consensus estimates provided by a survey of international investments banks. The economic analysis reflects cost estimates for construction and operations, as well as current and consensus commodity pricing for sales, each as of December 31, 2025.
The TRS does not revise any of the Mineral Reserves or Mineral Resources reported in the 2022 TRS and no material changes were made to the Company’s proposed mine plan as reported in the 2022 TRS and approved in the U.S. Forest Service’s 2025 Final Record of Decision.
The economic model in the TRS has been prepared using consistent methodology as previously presented in the Financial Update.

The TRS includes a revised capital cost estimate of $2.576 billion as of December 31, 2025, as well as certain increases in sustaining capex and operating costs in response to industry-wide inflationary pressures including increased input costs, geopolitical uncertainty and potential tariffs. The Company notes the revised project capital budget excludes pre-production revenues anticipated prior to the declaration of commercial production. Engineering, contracting and early works construction activities are ongoing, and may result in revisions to the costs, figures, methods and assumptions presented in the TRS as they progress.

Despite the increased costs, the Company’s base case economics have improved due to higher gold price assumptions. Incorporating both updated metal price assumptions and updated capital and operating cost estimates, the Project exhibits compelling project economics across a range of different gold price scenarios. Using long-term consensus pricing of $3,250/oz gold, $10/lb antimony and $40/oz silver, the base case reported a $3.5 billion unlevered, after-tax NPV5% and 23.5% project IRR. Assuming a $4,500/oz gold price, the TRS presents an unlevered after tax NPV5% of $6.1 billion and IRR of 32.3%.

Summarized results are presented below for reference:

ECONOMIC HIGHLIGHTS[1,2]

Production & Cost Highlights	Early Production Years 1-4	Life-of-Mine Years 1-15
Recovered Gold Total (Koz)	1,852	4,223
Recovered Antimony³ Total (Mlbs)	69.1	106.5
Recovered Gold Annual Average (Koz)	463	296
Cash Costs (net of by-product credits, $/gold oz)⁴	$250	$581
Total Cash Costs (net of by-product credits, $/gold oz)⁵	$311	$650
All-in Sustaining Costs (net of by-product credits, $/gold oz)⁶	$498	$833
Initial Capital, including contingency ($M)⁷	$2,576
	Early Production Years 1-4	Life-of-Mine Years 1-15
Assumptions: ($3,250/oz Au, $10.00/lb Sb, $40/oz Ag) – Base Case⁸
After-tax Net Present Value 5%⁹	$3.5 billion
Annual Average EBITDA¹⁰	$1,347 million	$766 million
Annual Average After-Tax Free Cash Flow (FCF)¹¹	$1,111 million	$607 million
Internal Rate of Return (After-tax)¹²	23.5%
Payback Period in Years (After-tax)	2.4 years
Assumptions: ($4,000/oz Au, $10.00/lb Sb, $40/oz Ag)
After-tax Net Present Value 5%⁹	$5.0 billion
Annual Average EBITDA¹⁰	$1,685 million	$983 million
Annual Average After-Tax Free Cash Flow (FCF)¹¹	$1,373 million	$775 million
Internal Rate of Return (After-tax)¹²	29.0%
Payback Period in Years (After-tax)	2.1 years
Assumptions: ($4,500/oz Au, $10.00/lb Sb, $40/oz Ag)
After-tax Net Present Value 5%⁹	$6.1 billion
Annual Average EBITDA¹⁰	$1,910 million	$1,128 million
Annual Average After-Tax Free Cash Flow (FCF)¹¹	$1,547million	$887million
Internal Rate of Return (After-tax)¹²	32.3%
Payback Period in Years (After-tax)	1.9 years
Assumptions: ($5,000/oz Au, $10.00/lb Sb, $40/oz Ag)⁸
After-tax Net Present Value 5%⁹	$7.1 billion
Annual Average EBITDA¹⁰	$2,136 million	$1,273 million
Annual Average After-Tax Free Cash Flow (FCF)¹¹	$1,722 million	$999 million
Internal Rate of Return (After-tax)¹²	35.3%
Payback Period in Years (After-tax)	1.8 years
(1) For additional information regarding the updated TRS, including underlying assumptions and risks, see the TRS and Annual Report on Form 10-K for the year ended December 31, 2025, filed March 31, 2026. (2) Assumes 100% equity financing. (3) Antimony is a chemical element included on the U.S. Interior Department’s list of Critical Minerals. (4) Cash Costs consist of mining costs, processing costs, mine-level G&A and by-product credits. By-product credits calculated based on flat $10/lb Sb and $40/oz Ag pricing. Cash Costs are a non-GAAP measure. See Non-GAAP Measures at the end of this release. (5) Total Cash Costs consist of Cash Costs, royalty costs, treatment costs, refining costs, and transportation costs. By-product credits calculated based on flat $10/lb Sb and $40/oz Ag pricing. Total Cash Costs is a non-GAAP measure. See Non-GAAP Measures at the end of this release (6) AISC includes Total Cash Costs plus sustaining capital costs. By-product credits calculated based on flat $10/lb Sb and $40/oz Ag pricing. AISC is a non-GAAP measure. See Non-GAAP Measures at the end of this release. (7) Initial Capital, reflects estimated total capital expenditures of $2,576 million as of December 31, 2025, including a contingency of $191.9 million, but exclusive of pre-production revenue. (8) Base Case corresponds to long-term average metal price forecast of global investment banks as of December 31, 2025, and long-term average price forecasts for silver and antimony. (9) Net Present Value (NPV) is defined as the present value of future after-tax cash flows of the project discounted at an annual rate of 5%. Assumes a combined state and federal effective tax rate of approximately 26.45%. (10) EBITDA consists of total revenue minus operating costs, offsite charges and royalties. EBTIDA is a non-GAAP measure. See Non-GAAP Measures at the end of this release. (11) After-Tax Free Cash Flow consists of EBITDA as adjusted for changes in net working capital, all capital expenditures (initial, sustaining, and closure capital expenditures), and salvage value, less taxes payable. Free Cash Flow is a non-GAAP measure. See Non-GAAP Measures at the end of this release. (12) Internal rate of return (IRR) is defined as the after-tax discount rate at which the NPV of the Project reaches zero. Assumes a combined state & federal effective tax rate of approximately 26.45%.

Annual Report 2025 Highlights and 2026 Outlook

On March 31, 2026, Perpetua filed its annual report for 2025 reporting on a year of critical permitting, financing and development milestones. These included the U.S. Forest Service’s issuance of the Final Record of Decision and approval of the Plan of Operations for the Project, over $850 million of equity financing raised, posting of approximately $160 million of construction phase financial assurance with federal and state agencies, and commencement of early works construction at Stibnite on October 21, 2025. Perpetua completed basic engineering in January 2025 and progressed detailed engineering for the Project throughout 2025, appointing Hatch Ltd. as the EPCM contractor in December to manage key project components including the processing plant, pressure oxidation facility, and certain other in-scope infrastructure, utilities and facilities. Perpetua executed key contracts to progress engineering and construction readiness during the year, including a procurement contract with Idaho Power for critical long-lead power line items and a contract with ATCO for the design, construction and installation of camp housing.

Looking ahead to 2026, the Company’s highest priority near-term key objective remains closing the proposed senior secured loan with U.S. EXIM to finance the construction and development of the Project. Meanwhile, detailed engineering, contracting, and procurement continue as the Company plans to be construction-ready in the second half of 2026. Expanding in-house expertise through additions to management and the operational team will further support construction and operational readiness.

Key priorities outside of construction are focused on advancing downstream antimony processing and offtake discussions and ramping up Project-wide exploration. While many exploration targets represent opportunities to expand current gold and antimony resources and reserves, Perpetua is also seeking to validate potential tungsten opportunities at the Project given extensive historical production. Additional environmental review and permitting may be required to proceed with certain opportunities, if they are available and depending on their scope. Additional information on 2026 goals and objectives can be found in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025, which was filed with the Securities and Exchange Commission and with Canadian securities regulators on March 31, 2026.

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

Joe Fazzini

Vice President, Investor Relations

joe.fazzini@perpetuacorp.us

info@perpetuacorp.us

Chris Fogg

Investor Relations Manager

chris.fogg@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 ex-ploration, 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 Stibnite Gold 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. Antimony trisulfide from Stibnite is the only known domes-tic reserve of antimony that can meet U.S. defense needs for many small arms, munitions, and missile types.

FORWARD-LOOKING STATEMENTS

Investors should be aware that the U.S. EXIM notification to Congress does not represent a financing commitment from U.S. EXIM and is subject to approval of the proposed loan by the U.S. EXIM board following the 25-day notice period. There can be no assurance that the board of U.S. EXIM will approve the proposed loan after the notice period, or at all, that we will be able to successfully negotiate definitive loan documents to close the loan or that, if closed, any funding provided by U.S. EXIM will be sufficient for us to construct 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, anticipated timing and potential outcome of the Company’s U.S. EXIM financing application and notification to Congress; the amount of potential debt financing available to the Company through U.S. EXIM or otherwise; timing of anticipated milestones related to the Project and financing; ongoing funding and anticipated liquidity; our ability to comply with, obtain and defend permits related to the Project; the expected outcomes of the Project, including our mineral reserves and mineral resources; environmental clean-up actions by us and our contractors; the expected commercial demand for antimony and the Company’s ability to supply it; our ability to successfully implement and fund the Project; the occurrence of the expected benefits from the Project; the realization of benefits from strategic partnerships; the timing and results of future exploration and material sampling by the Company, including with respect to tungsten; plans for the design and construction of the Project; the viability of the Project; expected construction, development and operating costs in the event that a production decision is made; planned exploration and development of properties and the results thereof; and development of any additional resources and reserves and the permitting requirements with respect to any such additional resources and reserves. 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, the U.S. EXIM financing application will close and fund within the expected timeframe at the amount equal to or higher than the current indicative amount; that the U.S. EXIM board will approve the proposed loan on substantially the terms initially indicated by the U.S. EXIM board and that the Company will be able to satisfy the conditions to signing and closing of the U.S. EXIM loan and to receive committed funds when needed; 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; that the Company will be able to maintain compliance with covenants contained in its financing agreements or that may be contained in future financing agreements; that the Company will be able to satisfy additional bonding or financial assurance requirements in the future; that no pending or future litigation will result in the loss of any permits or material delay to the Project schedule or a material increase to Project costs; 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 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 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, 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

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, S-K 1300 Technical Report Summary, Valley County, Idaho, USA,” dated as of December 31, 2025 (the “TRS”), developed for the Stibnite Gold Project in accordance with the mining property disclosure rules specified in Regulation S-K subpart 1300 (“S-K 1300”) promulgated by the SEC and published on March 31, 2026. Such information is as of December 31, 2025 and is subject to the assumptions, exclusions and qualifications set forth in the TRS. For additional information regarding the TRS, investors are encouraged to refer to the Company’s Annual Report on Form 10-K for the year ended December 31, 2025, filed with the SEC on March 31, 2026. Data regarding domestic antimony reserves based on U.S. Geological Survey, Mineral Commodity Summaries, dated as of January 2026.

Qualified Persons: The technical information in this press release has been reviewed and approved by Christopher Dail, AIPG CPG #10596, Exploration Manager for Perpetua Resources Idaho, Inc. and James Norine, P.E., Senior Vice President, Projects for Perpetua Resources Idaho, Inc. and each meet the definition of a “qualified person” as defined in National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”) and in S-K 1300. Mr. Dail and Mr. Norine are not responsible for statements attributed to officers and directors of the Company or third parties, or other non-technical information in this press release.

Non-GAAP Measures

This news release includes disclosure of certain non-GAAP financial measures or ratios, including expected Cash Costs, Total Cash Costs, All-In Sustaining Costs (AISC), Average Annual EBITDA and Annual Average Free Cash Flow (FCF) with respect to the expected results of the Project. The Company uses these measures to evaluate the Company’s future operating performance and provide visibility into the economics of our future mining operations. We believe the projected non-GAAP financial measures included in this news release provide readers with additional meaningful comparisons between the Company’s Project and its peer companies. These projected non-GAAP financial measures are not historical measures of financial performance and are not presented in accordance with GAAP. They may exclude items that will be significant in understanding and assessing our financial results. Therefore, these measures should not be considered in isolation or as an alternative or superior to GAAP measures. You should be aware that these measures have no standardized meaning under GAAP and may not be comparable to similarly-titled measures used by other companies.

We define “Cash Costs” as the sum of mining costs, processing costs, mine-level G&A and by-product credits; we define “Total Cash Costs” as the sum of Cash Costs, royalty costs, treatment costs, refining costs, and transportation costs; we define “All-In Sustaining Costs” as the sum of Total Cash Costs and sustaining capital costs (all costs required to sustain operations); we define earnings before interest, taxes and depreciation and amortization (EBITDA) as total revenue minus operating costs, offsite charges and royalties; we define “Free Cash Flow” as EBITDA as adjusted for changes in net working capital, all capital expenditures (initial, sustaining, and closure capital expenditures), and salvage value; and we define After-Tax FCF as FCF less taxes payable. FCF does not entirely represent cash available for discretionary expenditures due to the fact that the measure does not deduct payments required for debt service and other items. Annual averages of non-GAAP measures represent the total value of the non-GAAP measure divided by the number of years during the forecast period.

As the Project is not in production, the prospective non-GAAP financial measures are based on the estimated revenues, costs and other metrics set forth in the TRS, and are subject to the assumptions, qualifications and exceptions set forth in the TRS. The economic analysis in the TRS is not a true cash flow model as defined by financial accounting standards but rather a representation of Project economics at a level of detail appropriate for a pre-feasibility study level of engineering and design. As such, the projected non-GAAP measures included in this news release cannot be reconciled to comparable GAAP measures without unreasonable effort.

The non-GAAP financial measures included in this news release are forward-looking statements and remain subject to the risks and uncertainties set forth in the section titled “Forward-Looking Information” in this news release.

Press Releases

Perpetua Resources Publishes 2025 Sustainability Report

Perpetua Resources Reports Results of 2026 Annual Meeting

Perpetua Resources Advances Construction of the Stibnite Gold Project

Export Import Bank of the United States Approves $2.9 Billion Loan for Development of Perpetua Resources’ Stibnite Gold Project

Perpetua Resources Announces First Quarter 2026 Financial Results

U.S. EXIM’s Board Advances Proposed $2.7 Billion Loan to Congressional Notice & Perpetua Announces Improved Project Economics

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