Press Releases

Natalie Podgorski 8/6/26 Natalie Podgorski 8/6/26

Perpetua Resources Reports New High-Grade Gold and Antimony Discoveries and a New Gold-Tungsten Zone at Stibnite

BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources” or “Perpetua” or the “Company”) is pleased to report drilling results and provide an update on its 2026 exploration program in Valley County, Idaho. The exploration plan was approved by the U.S. Forest Service in 2025.

“Our focus is on drilling areas that align with our currently planned mining sequence with potential to directly add value,” said Jon Cherry, President and CEO of Perpetua. “Our priority is testing higher-grade gold and antimony targets within our three permitted pits that could supplement our existing Stibnite Gold Project (the “Project”) mine plan with the aim of sustaining or exceeding our estimated annual average production level of 463,000[1] gold ounces beyond our first four years of production. We have also identified gold and antimony exploration targets with the potential to allow for extensions of the existing permitted pits within the Project and are evaluating opportunities to expand our overall resource base beyond the existing Project scope. This includes identifying potential sources of tungsten that could enhance the value of Perpetua’s broader land package. These targets are based on previous drilling, historic mining activities and recently defined prospects across the broader, highly prospective land package. Any activity outside the scope of the currently permitted project may require additional regulatory review.”

Recent drilling between the currently permitted Yellow Pine and West End reserve pits continues to reveal compelling new mineralization, including multiple high-grade gold intervals and a new gold-tungsten discovery. Significant high-grade gold intercepts, including a gold-tungsten intercept, have been identified in the Clark Tunnel Fault Zone (“CTFZ”) located along the southeastern edge of the proposed Yellow Pine pit. Additional occurrences of scheelite, a tungsten-bearing mineral, have been observed in ongoing drilling in the CTFZ. In addition, widely spaced drilling and surface sampling at the Huckleberry Fault Zone (“HFZ”) returned broad intervals of gold mineralization. Lying immediately adjacent to the Yellow Pine reserve pit limits, the HFZ spans over 100 meters in width and has been traced across 0.5km of strike length, with historic data indicating higher-grade lenses can occur. At the Hangar Flats deposit, drilling at the NDMEA zone encountered additional high-grade gold, while critical mineral-focused drilling at Hangar Flats returned significant antimony-tungsten intercepts. These results collectively demonstrate further opportunities to grow and unlock the 3.1 million ounces of indicated and inferred gold resources and 99.8 million pounds of antimony resources that are located outside current reserves.

Exploration drilling is currently underway with 4 rigs and approximately 5,800 meters of new drilling complete to date. The results presented below are from recently completed drill programs totaling 8,340 meters, which was split between geotechnical drilling and exploration. Notable new intercepts include:

Yellow Pine Clark Tunnel Fault Zone (CTFZ) Discovery[2]

• Hole SB597: 21.3 meters of 3.2 g/t gold and 0.9% tungsten from 24 meter depth, incl. 7.0 meters grading 7.1 g/t gold and 0.3% tungstenfrom 34 meter depth

• Hole SB580: 6.4 meters of 16.2 g/t gold and 1.7% antimony from surface

• Hole SB582: 15.0 meters of 6.3 g/t gold and 0.8% antimony from 11 meter depth

• Hole SB581: 5.5 meters of 14.2 g/t gold and 1.2% antimony from 8 meter depth

• Hole SB579: 4.6 meters of 10.0 g/t gold and 0.6% antimony from 9 meter depth

• Hole SB578: 4.9 meters of 9.3 g/t gold and 0.7% antimony from 7 meter depth

• Hole SB576: 3.4 meters of 9.6 g/t gold and 0.4% antimony from 7 meter depth

• Hole SB577: 3.0 meters of 9.4 g/t gold and 0.9% antimony from 9 meter depth

Yellow Pine Huckleberry Fault Zone (HFZ)2

• Hole SB588: 69.6 meters of 0.8 g/t gold from 61 meter depth (Lower Huckleberry)

• Hole SB595: 41.6 meters of 0.8 g/t gold from 131 meter depth (Upper Huckleberry), including 21.8 meters of 1.2 g/t gold from 148 meters depth

Hangar Flats Extensions (NDMEA zone)2

• Hole SB584: 3.0 meters of 14.5 g/t gold from 82 meter depth

• Hole SB585: 5.5 meters of 1.1 g/t gold and 0.3% antimony from 108 meter depth

Hangar Flats Antimony and Tungsten Results (excluding gold assays)2,[3]

• Hole SB519: 22.9 meters of 3.2% antimony and 1.2% tungsten from 330 meter depth, incl. 4.4 meters of 4.3% antimony and 3.3% tungsten from 334 meter depth and 1.8 meters of 8.3% antimony and 4.6% tungsten from 351 meter depth

• Hole SB522: 9.8 meters of 8.3% antimony and 4.6% tungsten from 260 meter depth

• Hole SB527: 3.4 meters of 10.6% antimony and 1.5% tungsten from 247 meter depth

Hole SB524: 1.7 meters of 10.5% antimony and 1.8% tungsten from 256 meter depth

Figure 1: Location of Existing Resource/Reserves and Recent Drill Results

Figure 2: Yellow Pine-Clark Tunnel Fault Zone (CTFZ) and Huckleberry Fault Zone (HFZ)

Figure 3: Hangar Flats and NDMEA Zone

2026 Drilling Program Highlights:

• A minimum of 10,000 meters of core drilling is planned for 2026 using 4 drill rigs with the ability to expand the program if warranted, based on results. Perpetua estimates approximately 5,800 meters of the 2026 core drilling program have been completed and are in preparation for assay.

• Initial drilling was planned for potential expansion of the gold and antimony pits in the currently approved mine plan will test along strike and at depth within the Yellow Pine and Hangar Flats deposits. This includes follow-up drilling on the Clark Tunnel Fault Zone and Huckleberry Fault Zone

• Definition drilling within existing approved footprints is planned with the goal of upgrading inferred resources to measured and indicated categories. Additional testing is also planned for several known high-grade targets near the current pits and located close to planned future milling infrastructure

• Any future development of target exploration areas that are not approved for mining in the current plan of operations will require additional environmental review and permitting to be completed before mining could commence in these areas

Tungsten Emerges as Additional Strategic Opportunity at Stibnite

During the first half of 2026, Perpetua became aware of U.S. government-sponsored initiatives focused on tungsten. Based on the historical production of both antimony and tungsten at Stibnite and given that recent drilling confirmed areas in the Hangar Flats deposit host a combination of high-grade antimony (5-13%) and tungsten (1-6%) at varying widths of 1-10 meters, the Company has submitted proposals seeking U.S. grant funding to undertake drilling, sampling, metallurgical analysis, and resource evaluation. While there can be no assurance that the Company will obtain such grant funding or that economically accessible quantities of tungsten will be identified, Perpetua believes its broader claim package is uniquely positioned to help the U.S. government potentially secure a second critical mineral, in addition to antimony, from the Stibnite mining district. Any tungsten development will require separate public & environmental review and permitting outside the scope of the currently permitted project.

In its grant proposal, Perpetua proposed to embark on a program focused on drilling and metallurgical sampling beneath the Hangar Flats pit. This work would serve a dual strategic purpose of enabling drilling to test known high-grade antimony-tungsten mineralization at depth while simultaneously providing additional testing of significant gold and antimony resources previously identified but not included in Perpetua’s current mine plan. Previously reported drill holes (listed below) indicate the promising potential for recovery of tungsten near areas in the existing mine plan.

Hangar Flats Previously Released Gold, Antimony and Tungsten Intercepts

· Hole SB21: 65.2 meters of 3.0 g/t gold, 2.9% antimony, 0.04% tungsten from 244 meter depth

· Hole SB134: 2.4 meters of 1.4 g/t gold, 0.2% antimony, 1.52% tungsten from 216 meter depth

· Hole SB165: 4.6 meters of 1.6 g/t gold, 1.8% antimony, 1.17% tungsten from 258 meter depth

· Hole SB192: 32.3 meters of 1.4 g/t gold, 4.7% antimony, 2.66% tungsten from 316 meter depth

· Hole SB193: 75.0 meters of 1.6 g/t gold, 2.6% antimony, 0.88% tungsten from 281 meter depth

· Hole SB203: 17.5 meters of 1.5 g/t gold, 7.6% antimony, 0.71% tungsten from 309 meter depth

Global Export Restrictions Have Made Tungsten High Priority Once Again

Historically, the Stibnite district was not only a major producer of antimony, but also one of America’s most significant historical tungsten-producing regions. Following the discovery of tungsten at Yellow Pine by the U.S. Bureau of Mines and U.S. Geological Survey in the spring of 1941, production at Stibnite commenced just months later in August of that year. From 1941 to 1945, the Stibnite deposit produced more tungsten than any other mine in the United States with an estimated 611,284 short tons of ore produced averaging 1.645% WO₃. In total, this represented approximately 50% of all tungsten consumed by the United States during the Second World War and the Korean War.

Following the war, the U.S. relied on Chinese imports with China producing an estimated 80% of global tungsten production in recent years[4]. However, increasing trade tensions resulted in the imposition of Chinese export restrictions of certain critical minerals in February 2025. These restrictions impacted both tungsten and antimony. Given the absence of substitutes, these restrictions pushed tungsten APT (Ammonium Paratungstate) prices up more than 500% from their lows in 2024. Both antimony and tungsten are designated as U.S. government critical minerals due to their importance in national defense applications and domestic manufacturing. Tungsten’s ability to retain strength at high temperatures and extreme hardness make it irreplaceable for military applications, though most tungsten consumption (60%) is for use in cemented carbide parts for other key industries including construction, metal working, mining and oil & gas exploration.

Figure 4: Historical Photos of Tungsten Mining at Stibnite

*Source: George Nock, Bradley Mining Company Collection*

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

Joe Fazzini, CA, CPA, CFA

Vice President, Corporate Development & Investor Relations

joe.fazzini@perpetuacorp.us

Info@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.

Cautionary Statement Regarding Technical Information

The technical information in this news release has been prepared in accordance with the mining property disclosure rules specified in Regulation S-K subpart 1300 (“S-K 1300”) promulgated by the Securities and Exchange Commission and Canadian regulatory requirements set out in National Instrument 43-101 (“NI 43-101”), and has been reviewed and approved by Christopher Dail, CPG, Director, Exploration, and a Qualified Person as defined in NI 43-101 and in S-K 1300. Mr. Dail is not independent of the issuer.

Except for the exploration results presented herein, the technical and 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 S-K 1300 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.

There can be no assurance that exploration activities will result in the discovery of additional resources or reserves and isolated exploration results may not be indicative of the occurrence of a mineral deposit. Such results do not provide assurance that further work will establish sufficient grade, continuity, metallurgical characteristics and economic potential to be classed as a category of mineral resource. Exploration results are inherently uncertain and subject to numerous risks and uncertainties, including geological factors, market conditions, and regulatory changes. Furthermore, development of any additional resources and reserves discovered would be subject to any applicable NEPA and permitting requirements.

Data regarding domestic antimony and tungsten reserves are based on U.S. Geological Survey, Mineral Commodity Summaries, dated as of January 2026.

Quality Assurance
The exploration activities at the Stibnite Gold Project site were carried out under the supervision of Richard Moses, C.P.G., Christopher Dail, C.P.G., Austin Zinsser, SME-R.M., and Kent Turner, SME-R.M., all Qualified Persons as defined in NI 43-101 and in S-K 1300.

All gold assays are by a 30g Fire Assay charge followed by an atomic absorption finish (with a 0.005g/t lower reporting limit). Samples reporting values > 6g/t gold are re-analyzed using a 30g Fire Assay charge followed by a gravimetric finish. Silver is analyzed via a 4-acid digestion followed by an ICP finish (with a 0.5g/t lower reporting limit). Samples reporting values > 10g/t silver are reanalyzed using a 50g Fire Assay charge followed by a gravimetric finish. Antimony is analyzed via a 4-Acid digestion with ICP finish with a 5g/t lower reporting limit. Samples reporting values >500g/t antimony are reanalyzed using XRF fusion. Some intervals may not add or subtract correctly due to rounding, but differences are deemed insignificant.

Samples were handled, shipped via Chain of Custody Procedures. Analyses were carried out by ALS Global Laboratories in their Reno and Elko, Nevada and Vancouver, British Columbia laboratories. Umpire samples are routinely submitted to third party labs and blank and standard samples are inserted at appropriate intervals for quality assurance and quality control. A review of the results of analyses of blanks, standards and duplicates by the Company’s Qualified Person indicates values are within normal and acceptable ranges.

Antimony and tungsten analysis for Hangar Flats drill holes SB519-SB527 were performed with a Vanta Portable XRF in the field. Multiple readings were collected and averaged. The XRF protocol entailed analysis of reference standards and a blank sample throughout the use of the instrument. Overall, 99 non-duplicate analyses with appropriate data formatting were collected from QA/QC samples, representing approximately 5% of total analyses. Generally, the XRF QA data is considered sufficient for the objectives of the program.

Forward-Looking Information

Investors should be aware that no funding has been committed in connection with the Company’s application for grant funding for tungsten exploration. There is no assurance that the application will be successful and, if successful, whether any funding awarded will be sufficient to conduct the proposed exploration activities or that such exploration will produce positive results.

[1]Based on average annual recovered gold for Years 1-4 as reported in the Technical Report Summary for the Project, dated as of December 31, 2025. See “Cautionary Statement Regarding Technical Information” below.

[2] True widths are estimated to be approximately 85-95% of the reported interval lengths based on the current interpretation of drill hole orientation relative to the mineralized zone.

[3] Antimony and tungsten drilling in the Hangar Flats deposit was designed to collect bulk samples for metallurgical testing. Drill core was analyzed on-site using portable XRF equipment, after which samples were composited and submitted to SVL Analytical (Kellogg, Idaho) for XRF and wet chemical titration analysis of antimony and tungsten. Gold grades were not assessed as part of this program.

[4] "Stibnite Historic District," National Register of Historic Places Nomination Form, NPS Ref. No. 87001186 (listed July 19, 1987).

Natalie Podgorski 7/30/26 Natalie Podgorski 7/30/26

Perpetua Resources, US Army, and Idaho National Laboratory Launch Critical Minerals Pilot Plant to Advance Antimony Trisulfide Supply

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BOISE, ID – Perpetua Resources Corp. (Nasdaq: PPTA / TSX: PPTA) (“Perpetua Resources,” “Perpetua,” or the “Company”), the U.S. Army and Idaho National Laboratory (“INL”), managed by Battelle Energy Alliance LLC (“Battelle”), announced the opening of a new modular mineral processing plant (“pilot plant”). The pilot plant is designed to demonstrate and help establish a secure, end-to-end domestic supply chain for antimony, a critical mineral essential to U.S. national security. Idaho Governor Brad Little, Lieutenant Governor Scott Bedke, U.S. Representative Mike Simpson, and INL Laboratory Director John Wagner joined Perpetua President and CEO Jon Cherry for a ribbon-cutting ceremony marking the facility’s opening on July 29, 2026.

Located at the INL in Idaho Falls, the modular mineral pilot plant is designed to utilize antimony samples from Perpetua’s Stibnite Gold Project in central Idaho with the goal of demonstrating how to process high-quality antimony trisulfide for use in specialized military and industrial applications. Antimony is used in products ranging from defense munitions and battery technologies to solar glass and flame retardants. In recent years, China and Russia have dominated the global production of antimony, leaving the United States heavily reliant on foreign sources of the critical mineral. In 2021, China ceased providing the United States with the specialized form of antimony trisulfide essential for more than 300 types of ammunition. Shortly thereafter, the U.S. Department of War and Perpetua Resources entered into a strategic effort focused on advancing domestic antimony trisulfide production. Perpetua’s Stibnite Gold Project contains the only identified domestic reserve of antimony and is in development to provide a large-scale domestic source of the critical mineral alongside significant gold production.

"From the mountains of central Idaho to the national laboratories advancing America’s defense and energy capabilities, today’s milestone shows what’s possible when industry, government, and scientific innovation work together on practical domestic solutions,” said Jon Cherry, President & CEO of Perpetua Resources. "As construction advances at the Stibnite Gold Project, this pilot plant extends that momentum downstream by helping establish the capabilities needed to produce military-grade antimony materials here in America. Together, these investments are laying the foundation for a secure, end-to-end domestic supply chain that strengthens national security while creating long-term economic opportunity."

The pilot plant combines the nation’s only identified domestic antimony reserve with INL’s advanced materials expertise to further advance innovation, train a skilled workforce, and strengthen the technical capabilities needed to rebuild commercial-scale domestic critical mineral production in America. The pilot plant is the culmination of a multi-year collaboration between the U.S. Army via the Defense Ordnance Technology Consortium (DOTC) and Perpetua Resources to advance a fully domestic, “ground-to-round” antimony supply chain. The facility also has the potential to support future processing of additional critical minerals, creating a scalable platform to strengthen U.S. supply chain resiliency.

“This pilot plant is more than a demonstration facility; it's an investment in the nation's critical mineral future," INL Laboratory Director John Wagner said. "The data and operational experience generated here will help advance domestic antimony production while demonstrating how national laboratories, industry and government can work together to strengthen America's supply chains and national security.”

"Establishing resilient domestic supply chains for critical minerals is vital to our national defense,” said Col. Steve Adcock, Portfolio Management Executive Ammunition & Energetics at Picatinny Arsenal. “This pilot plant represents an important step toward reducing America's dependence on foreign sources of antimony while strengthening the industrial capabilities needed to support our warfighters. Partnerships like this help ensure the United States can reliably access the materials essential to military readiness."

The pilot plant reflects years of federal collaboration to strengthen America's domestic critical mineral capabilities. Support from Congress has helped advance partnerships among industry, national laboratories, and the Department of War to rebuild a secure domestic supply chain for antimony.

"We've worked to rebuild America's critical mineral supply chains because our national security depends on them," said U.S. Representative Mike Simpson (R-Idaho). "Today's ribbon cutting is a significant milestone in that effort. By bringing together Perpetua Resources, the Idaho National Laboratory, and the U.S. Army, this project demonstrates how Idaho is helping strengthen our nation's defense, expand domestic manufacturing capabilities, and reduce our reliance on foreign sources of critical minerals. I'm proud to have supported this partnership from the beginning and look forward to seeing the important role it will play for our country."

The collaboration continues to position Idaho as a national leader in critical minerals, scientific innovation, and public-private partnerships that strengthen both the state's economy and America's security.

"This partnership between Idaho National Laboratory and Perpetua Resources is a major step toward securing America's critical mineral supply chain and reducing our dependence on foreign-controlled resources,” said Idaho Governor Brad Little. “By combining Idaho's abundant natural resources with world-class innovation, we are strengthening our national security, creating good-paying jobs, and reinforcing Idaho's leadership in the industries that will power America's future.”

Located in the historic Stibnite Mining District in central Idaho, the Stibnite Gold Project is one of the nation's most strategically significant critical mineral projects. During World War II, the district supplied antimony and tungsten to support the American war effort. Perpetua Resources has designed the Stibnite Gold Project to redevelop the historic mine site for gold and antimony. After more than a decade of scientific study, engineering, environmental review, and stakeholder engagement, the Project received its final federal approvals in 2025 and advanced into early works construction. Early works activities are underway, including infrastructure improvements that will support full-scale development, positioning the Project to help restore America's domestic antimony supply while delivering environmental restoration, high-quality jobs, and long-term economic benefits for Idaho and the nation.

Since 2022, Perpetua has been awarded over $87 million from the U.S. Department of War and the U.S. Army to advance the Project and America’s antimony supply. Perpetua has received more than $59 million in Defense Production Act Title III funds from the U.S. Department of War. In June 2026, Perpetua was awarded up to an additional $4.7 million under the DOTC program, increasing the total funding awarded to Perpetua from the U.S. Army to $27 million under the Ordnance Technology Initiative Agreement (“OTIA”) originally entered into between Perpetua Resources and the U.S. Army in August 2023.

Together, the pilot plant and the Stibnite Gold Project demonstrate how responsible resource development and innovation can restore America’s critical mineral supply chain, strengthen national security and reduce reliance on foreign sources.

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

Mckinsey Lyon

Senior Vice President External Affairs

media@perpetua.us

Website: www.perpetuaresources.com

About Perpetua Resources and the Stibnite Gold Project

About Idaho National Laboratory

INL is the nation's center for nuclear energy research and development, also focusing on strategic national security technologies, critical minerals, energy, and workforce development to sustain American competitiveness and security. Perpetua's agreement with INL is through Battelle Energy Alliance, which manages INL for the Department of Energy.

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 Department of War 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.

Forward-Looking Statements

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,” “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, the realization of benefits from strategic partnerships, including the partnership with Idaho National Laboratory; the timing and results of future material sampling conducted by the Company; the expected design, construction, commissioning, operation, testing and results of the pilot plant; the expected outcomes of the Project; 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; 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 the anticipated economic, environmental and other benefits of the Project; the viability of the Project; expected commercial demand for antimony and the Company’s ability to supply it; 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; 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, 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 pilot plant will be constructed, commissioned and operated substantially as planned; 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, 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 the pilot plant may not operate as planned or demonstrate the expected processing results; 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; 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.ca. Except as required by law, the Company expressly disclaims any obligation to update the Forward-Looking Information herein.

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

Perpetua Resources Publishes 2025 Sustainability Report

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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

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.

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.

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

Press Releases

Perpetua Resources Reports New High-Grade Gold and Antimony Discoveries and a New Gold-Tungsten Zone at Stibnite

Perpetua Resources, US Army, and Idaho National Laboratory Launch Critical Minerals Pilot Plant to Advance Antimony Trisulfide Supply

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

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