Dundee Precious Metals

Eloro Resources Ltd. (TSX: ELO; OTCQX: ELRRF; FSE: P2QM) (“Eloro”, or the “Company”) is pleased to announce that, by mutual agreement with Empresa Minera Villegas S.R.L. (“Minera Villegas”), the title holder of the Iska Iska silver-tin polymetallic project in the Potosi Department, southern Bolivia (“Iska Iska”), the payment schedule in connection with the US$4,450,000 remaining portion of the aggregate US$10,000,000 payment required for Eloro to earn a 100% interest in Iska Iska has been amended, as follows:

Note (1) – The US$1,800,000 incurred by the Company in exploration expenditures on the adjacent Mina Casiterita property is deducted from the remaining Iska Iska option payments and will be applied towards the Mina Casiterita and Mina Hoyada option agreement.

Concurrently, the Mina Casiterita and Mina Hoyada option agreement (see Eloro’s press release dated November 22, 2022) was amended to provide for the Company to make a cash payment of US$1,800,000 within 12 months from the date on which the mining rights for Mina Casiterita and Mina Hoyada are duly obtained and subject to all required regulatory approval, issue the titleholder 200,000 common shares of the Company when the transfer of the properties is completed.

About Eloro Resources Ltd.

Eloro is an exploration and mine development company with a portfolio of gold and base-metal properties in Bolivia, Peru and Quebec. Eloro has an option to acquire a 100% interest in the highly prospective Iska Iska Property, which can be classified as a polymetallic epithermal-porphyry complex, a significant mineral deposit type in the Potosi Department, in southern Bolivia. A NI 43-101 Technical Report on Iska Iska, which was completed by Micon International Limited, is available on Eloro’s website and under its filings on SEDAR+. Iska Iska is a road-accessible, royalty-free property. Eloro also owns an 82% interest in the La Victoria Gold/Silver Project, located in the North-Central Mineral Belt of Peru some 50 km south of the Lagunas Norte Gold Mine and the La Arena Gold Mine.

For further information please contact either Thomas G. Larsen, Chairman and CEO or Jorge Estepa, Vice-President at (416) 868-9168.

Information in this news release may contain forward-looking information. Statements containing forward-looking information express, as at the date of this news release, the Company’s plans, estimates, forecasts, projections, expectations, or beliefs as to future events or results and are believed to be reasonable based on information currently available to the Company. There can be no assurance that forward-looking statements will prove to be accurate. Actual results and future events could differ materially from those anticipated in such statements. Readers should not place undue reliance on forward-looking information.

Neither the TSX nor its Regulation Services Provider (as that term is defined in the policies of the TSX) accepts responsibility for the adequacy or accuracy of this release.

NexGen Energy Ltd. (TSX: NXE) (NYSE: NXE) (ASX: NXG) (“NexGen” or the “Company”) is pleased to announce the voting results for the election of the Company’s Board of Directors and the appointment of Sharon Birkett to the Company at its annual general and special meeting of shareholders held on June 17, 2025 (the “Meeting“).

Election of Directors

All nine nominees were elected to the NexGen Board of Directors at the Meeting. Each director will hold office until the Company’s next annual meeting of shareholders, or until they resign or a successor is elected or appointed. The voting results were as follows:

Update on Director Nominees

Ms. Birkett has extensive public and private equity experience, having served nearly two decades as Chief Financial Officer for Multi-Color/Collotype Labels, overseeing finance and accounting, corporate control functions, financial planning and analysis, board of directors reporting, compliance, and financial transactions. During her tenure, she completed 30 bolt-on acquisitions ranging from $20 million to over $1 billion, driving significant investor value. She is a qualified audit committee financial expert who advises and guides global organizations, boards of directors, and stakeholders on financial management, rapid business growth, risk, tax, treasury, audit, and compliance.

Ms. Birkett previously served as Director of Finance for Avery Dennison Materials Pty Ltd, a subsidiary of Avery Dennison Corporation. She is a member of the Australian Society of Certified Practicing Accountants and currently serves as an independent director and audit committee chair of ENVU, a private-equity owned global provider of professional herbicides, insecticides and pesticides for non-agricultural uses.

Christopher McFadden, Chair of the Board of Directors, commented: “On behalf of the entire team at NexGen, I would like to warmly welcome Ms. Birkett to the Company’s Board. Ms. Birkett brings to the Board strong expertise in strategic corporate governance and financial management. She has a proven track record in corporate leadership and business growth, having played a key role in the transformation of organizations into muti-billion dollar enterprises unlocking significant shareholder value. This skillset will serve NexGen well as the Company advances toward final approvals for the Rook I Project, securing financing, initiating construction and ultimately transitioning into production.”

Miss Birkett’s appointment follows the retirement of long-serving Board member and Chair of the Audit Committee, Trevor Thiele, whom after 12 years of exemplary service to NexGen and its valued shareholders, has chosen not to stand for re-election. Ms. Birkett will assume the role of Chair of the Audit Committee effective immediately following Mr. Thiele’s retirement.

Mr. McFadden continued, “I would also like to take this opportunity to acknowledge the significant contribution from Mr. Thiele, who has demonstrated exemplary service to the NexGen Board of Directors and our valued shareholders over the past 12 years. With his extensive experience in senior finance roles, and his strong understanding of the global nuclear landscape, Mr. Thiele has played an instrumental leadership role in guiding the Company through exponential growth, while ensuring the integrity and effectiveness of NexGen’s financial reporting and internal controls. On behalf of the Board and the entire NexGen team, we wish Mr. Thiele the very best and thank him for his outstanding service.”

Following the mailing of the Management Information Circular, Ms. Susannah Pierce informed the Company that she would not be standing for re-election at the Meeting due to other professional commitments. As a result, she is not included among the nominees listed above. The Company and its Board of Directors thank Ms. Pierce for her valuable contributions and dedicated service during her tenure.

About NexGen

NexGen Energy is a Canadian company focused on delivering clean energy fuel for the future. The Company’s flagship Rook I Project is being optimally developed into the largest low cost producing uranium mine globally, incorporating the most elite standards in environmental and social governance. The Rook I Project is supported by a NI 43-101 compliant Feasibility Study which outlines the elite environmental performance and industry leading economics. NexGen is led by a team of experienced uranium and mining industry professionals with expertise across the entire mining life cycle, including exploration, financing, project engineering and construction, operations and closure. NexGen is leveraging its proven experience to deliver a Project that leads the entire mining industry socially, technically and environmentally. The Project and prospective portfolio in northern Saskatchewan will provide generational long-term economic, environmental, and social benefits for Saskatchewan, Canada, and the world.

NexGen is listed on the Toronto Stock Exchange, the New York Stock Exchange under the ticker symbol “NXE” and on the Australian Securities Exchange under the ticker symbol “NXG” providing access to global investors to participate in NexGen’s mission of solving three major global challenges in decarbonization, energy security and access to power. The Company is headquartered in Vancouver, British Columbia, with its primary operations office in Saskatoon, Saskatchewan.

Forward-Looking Information

The information contained herein contains “forward-looking statements” within the meaning of applicable United States securities laws and regulations and “forward-looking information” within the meaning of applicable Canadian securities legislation. “Forward-looking information” includes, but is not limited to, statements with respect to the delivery of clean energy fuel for the future, the development of the largest low cost producing uranium mine globally and incorporating elite standards in environmental and social governance, delivering a project that leads the entire mining industry socially, technically and environmentally, providing generational long-term economic, environmental and social benefits for Saskatchewan, Canada and the world, planned exploration and development activities and budgets, the interpretation of drill results and other geological information, mineral reserve and resource estimates (to the extent they involve estimates of the mineralization that will be encountered if a project is developed), requirements for additional capital, capital costs, operating costs, cash flow estimates, production estimates, the future price of uranium and similar statements relating to the economics of a project, including the Rook I Project. Generally, forward-looking information and statements can be identified by the use of forward-looking terminology such as “plans”, “expects”, “is expected”, “budget”, “scheduled”, “estimates”, “forecasts”, “intends”, “anticipates”, or “believes” or the negative connotation thereof or variations of such words and phrases or state that certain actions, events or results “may”, “could”, “would”, “might” or “will be taken”, “occur” or “be achieved” or the negative connotation thereof.

Forward-looking information and statements are based on NexGen’s current expectations, beliefs, assumptions, estimates and forecasts about its business and the industry and markets in which it operates. Forward-looking information and statements are made based upon numerous assumptions, including, among others, that, the results of planned exploration and development activities will be as anticipated and on time; the price of uranium; the cost of planned exploration and development activities; that, as plans continue to be refined for the development of the Rook I Project, there will be no changes in costs, engineering details or specifications that would materially adversely affect its viability; that financing will be available if and when needed and on reasonable terms; that third-party contractors, equipment, supplies and governmental and other approvals required to conduct NexGen’s planned exploration and development activities will be available on reasonable terms and in a timely manner; that there will be no revocation of government approvals; that general business, economic, competitive, social and political conditions will not change in a material adverse manner; the assumptions underlying the Company’s mineral reserve and resource estimates; assumptions made in the interpretation of drill results and other geological information; the ability to achieve production on the Rook I Project; and other estimates, assumptions and forecasts disclosed in the Feasibility Study for the Rook I Project. Although the assumptions made by the Company in providing forward-looking information or making forward-looking statements were considered reasonable by management at the time they were made, there can be no assurance that such assumptions will prove to be accurate.

Forward-looking information and statements also involve known and unknown risks and uncertainties and other factors, which may cause actual results, performances and achievements of NexGen to differ materially from any projections of results, performances and achievements of NexGen expressed or implied by such forward-looking information or statements, including, among others, negative operating cash flow and dependence on third-party financing, uncertainty of additional financing, the risk that pending assay results will not confirm previously announced preliminary results, the imprecision of mineral reserve and resource estimates, the price and appeal of alternate sources of energy, sustained low uranium prices, aboriginal title and consultation issues, exploration and development risks, climate change, uninsurable risks, reliance upon key management and other personnel, risks related to title to its properties, information security and cyber threats, failure to manage conflicts of interest, failure to obtain or maintain required permits and licences, changes in laws, regulations and policy, competition for resources, political and regulatory risks, general inflationary pressures, industry and economic factors that may affect the business, and other factors discussed or referred to in the Company’s most recent Annual Information Form under “Risk Factors” and management’s discussion and analysis under “Other Risks Factors” filed on SEDAR+ at www.sedarplus.ca and 40-F filed on Edgar at www.sec.gov.

Although the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in the forward-looking information or statements or implied by forward-looking information or statements, there may be other factors that cause results not to be as anticipated, estimated or intended. Readers are cautioned not to place undue reliance on forward-looking information or statements due to the inherent uncertainty thereof. The Company undertakes no obligation to update or reissue forward-looking information as a result of new information or events except as required by applicable securities laws.

NexGen Energy Ltd. (TSX: NXE) (NYSE: NXE) (ASX: NXG) (“NexGen” or the “Company”) is proud to announce the release of its 2024 Sustainability Report (“the Report”) that covers the period January 1, 2024, to December 31, 2024. The Report marks the fifth year that NexGen has reported on the Company’s robust Environmental, Social, and Governance profile. In addition to reporting in accordance with the Global Reporting Initiative (“GRI”) Standards, the Report demonstrates alignment with the Task Force of Climate-related Financial Disclosures (“TCFD”).

The Report is available on the Company’s website: 2024 Sustainability Report

Leigh Curyer, Chief Executive Officer, commented: “2024 proved to be a landmark year for NexGen – one defined by major achievements that bring us to the final stages of delivering the world’s largest high-grade uranium project, while delivering the most elite standards of health and safety, environmental protection and social well-being for all of our stakeholders. The exciting new discovery at Patterson Corridor East, further underscores the exceptional prospectivity of our land package and the long-term growth potential for the Company. With each milestone, we are not only advancing the Rook I Project but also shaping the landscape of responsible resource development. As we move toward becoming one of the most strategic mining companies, our steadfast commitment to sustainable development, elite environmental stewardship, and genuine community partnerships remains at the core of everything we do.”

Key Highlights from the Report:

Completion of Federal Environmental Assessment Technical Review and Setting of Hearing Dates

NexGen achieved a historic regulatory milestone, successfully completing the Canadian Nuclear Safety Commission (“CNSC”) Environmental Assessment (“EA”) technical review in November of 2024 – a first for a greenfield uranium mine and mill in Canada in 20 years. This follows the completion of the Provincial EA in November 2023. The Company is now preparing for the CNSC Commission Hearing currently scheduled to be complete in February 2026, and pending a positive EA decision, is ready to immediately commence construction.

2024 ABEX Community Involvement Award

NexGen was honoured with the 2024 ABEX Community Involvement Award from the Saskatchewan Chamber of Commerce for its genuine approach to building strong resilient communities through innovative and inclusive programs that are delivering a positive impact in the region.

Expanded Training and Education Programs

Expansion of the Company’s education and training initiatives included the launch of NexGen’s ‘Pathways to Your Future’ career development program. This, alongside other NexGen-initiated and funded programs have equipped over 500 local participants in the Local Priority Area (“LPA”) with essential technical and workplace skills for careers in uranium mining since 2023.

Local Employment and Procurement Opportunities

Prioritizing communities within the Local Priority Area (“LPA”), NexGen exceeded its aspirational employment and procurement targets, with 82% of Rook I site employees being LPA residents, and 94% of Rook I cash expenditure awarded to LPA suppliers.

Environmental Performance Through Energy Efficiency

NexGen optimized power generation at the Rook I Project through the implementation of a centralized power generation system and the installation of a pilot 24-kilowatt solar power system.

Active Environmental Management During Exploration

NexGen minimized its environmental footprint during exploration activity through a single area focused drill program, resulting in a 73% reduction in overall land disturbance. Additionally, the Company reclaimed 83% of land disturbed by exploration activity in 2024.

Economic Impact Update

Building on the updated initial capital, and sustaining and operating costs released during 2024, an economic impact study of the Rook I Project points to the significant scale of its potential positive effects. The forecasted total economic impact to the Province of Saskatchewan and Canada over the development and 11-year production period is $37 billion, with an average of 1,400 annual total jobs. Importantly, the Project is being permitted for a 24-year mine life, underscoring the opportunity for potentially greater long-term benefits, both economically and socially, well beyond the initial forecast.

Climate-Related Disclosure Alignment (“TCFD”)

NexGen completed a comprehensive TCFD gap analysis, followed by a climate-related risk assessment that evaluated physical and transition risks over short, medium, and long-term time horizons, ensuring that climate-related risks and opportunities are effectively integrated into NexGen’s broader risk management and strategic planning.

The 2024 Report has been prepared in accordance with the GRI Standards, in alignment with the TCFD and has been reviewed and approved by NexGen’s Executive Team, the Sustainability Committee as well as the full Board of Directors. NexGen will continue to optimize its sustainability reporting in line with the Company’s focus on accountability and transparency.

About NexGen

NexGen Energy is a Canadian company focused on delivering clean energy fuel for the future. The Company’s flagship Rook I Project is being optimally developed into the largest low cost producing uranium mine globally, incorporating the most elite standards in environmental and social governance. The Rook I Project is supported by a NI 43-101 compliant Feasibility Study which outlines the elite environmental performance and industry leading economics. NexGen is led by a team of experienced uranium and mining industry professionals with expertise across the entire mining life cycle, including exploration, financing, project engineering and construction, operations and closure. NexGen is leveraging its proven experience to deliver a Project that leads the entire mining industry socially, technically and environmentally. The Project and prospective portfolio in northern Saskatchewan will provide generational long-term economic, environmental, and social benefits for Saskatchewan, Canada, and the world.

NexGen is listed on the Toronto Stock Exchange, the New York Stock Exchange under the ticker symbol “NXE” and on the Australian Securities Exchange under the ticker symbol “NXG” providing access to global investors to participate in NexGen’s mission of solving three major global challenges in decarbonization, energy security and access to power. The Company is headquartered in Vancouver, British Columbia, with its primary operations office in Saskatoon, Saskatchewan.

Forward-Looking Information

The information contained herein contains “forward-looking statements” within the meaning of applicable United States securities laws and regulations and “forward-looking information” within the meaning of applicable Canadian securities legislation. “Forward-looking information” includes, but is not limited to, statements with respect to setting industry benchmarks with innovative and sustainable mining solutions and reflecting ongoing commitments to maximizing benefits to partners and stakeholders, the successful execution of the shaft sinking contract, the seamless transition to major construction following anticipated federal Environmental Assessment and licence approvals, the delivery of clean energy fuel for the future, the development of the largest low cost producing uranium mine globally and incorporating elite standards in environmental and social governance, delivering a project that leads the entire mining industry socially, technically and environmentally, providing generational long-term economic, environmental and social benefits for Saskatchewan, Canada and the world, planned exploration and development activities and budgets, the interpretation of drill results and other geological information, mineral reserve and resource estimates (to the extent they involve estimates of the mineralization that will be encountered if a project is developed), requirements for additional capital, capital costs, operating costs, cash flow estimates, production estimates, the future price of uranium and similar statements relating to the economics of a project, including the Rook I Project. Generally, forward-looking information and statements can be identified by the use of forward-looking terminology such as “plans”, “expects”, “is expected”, “budget”, “scheduled”, “estimates”, “forecasts”, “intends”, “anticipates”, or “believes” or the negative connotation thereof or variations of such words and phrases or state that certain actions, events or results “may”, “could”, “would”, “might” or “will be taken”, “occur” or “be achieved” or the negative connotation thereof.

Forward-looking information and statements are based on NexGen’s current expectations, beliefs, assumptions, estimates and forecasts about its business and the industry and markets in which it operates. Forward-looking information and statements are made based upon numerous assumptions, including, among others, that, third-party contractors, including Thyssen, will perform their contracts as expected and on time, the results of planned exploration and development activities will be as anticipated and on time; the price of uranium; the cost of planned exploration and development activities; that, as plans continue to be refined for the development of the Rook I Project, there will be no changes in costs, engineering details or specifications that would materially adversely affect its viability; that financing will be available if and when needed and on reasonable terms; that third-party contractors, equipment, supplies and governmental and other approvals required to conduct NexGen’s planned exploration and development activities will be available on reasonable terms and in a timely manner; that there will be no revocation of government approvals; that general business, economic, competitive, social and political conditions will not change in a material adverse manner; the assumptions underlying the Company’s mineral reserve and resource estimates; assumptions made in the interpretation of drill results and other geological information; the ability to achieve production on the Rook I Project; and other estimates, assumptions and forecasts disclosed in the Feasibility Study for the Rook I Project. Although the assumptions made by the Company in providing forward-looking information or making forward-looking statements were considered reasonable by management at the time they were made, there can be no assurance that such assumptions will prove to be accurate.

Forward-looking information and statements also involve known and unknown risks and uncertainties and other factors, which may cause actual results, performances and achievements of NexGen to differ materially from any projections of results, performances and achievements of NexGen expressed or implied by such forward-looking information or statements, including, among others, negative operating cash flow and dependence on third-party financing, uncertainty of additional financing, the risk that pending assay results will not confirm previously announced preliminary results, the imprecision of mineral reserve and resource estimates, the price and appeal of alternate sources of energy, sustained low uranium prices, aboriginal title and consultation issues, exploration and development risks, climate change, uninsurable risks, reliance upon key management and other personnel, risks related to title to its properties, information security and cyber threats, failure to manage conflicts of interest, failure to obtain or maintain required permits and licences, changes in laws, regulations and policy, competition for resources, political and regulatory risks, general inflationary pressures, industry and economic factors that may affect the business, and other factors discussed or referred to in the Company’s most recent Annual Information Form under “Risk Factors” and management’s discussion and analysis under “Other Risks Factors” filed on SEDAR+ at www.sedarplus.ca and 40-F filed on Edgar at www.sec.gov.

Although the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in the forward-looking information or statements or implied by forward-looking information or statements, there may be other factors that cause results not to be as anticipated, estimated or intended. Readers are cautioned not to place undue reliance on forward-looking information or statements due to the inherent uncertainty thereof.

There can be no assurance that forward-looking information and statements will prove to be accurate, as actual results and future events could differ materially from those anticipated, estimated or intended. Accordingly, readers should not place undue reliance on forward-looking statements or information. The Company undertakes no obligation to update or reissue forward-looking information as a result of new information or events except as required by applicable securities laws.

NexGen Energy Ltd.  (TSX: NXE) (NYSE: NXE) (ASX: NXG) (“NexGen” or the “Company”) is pleased to announce that the Saskatchewan Ministry of Environment has granted approval for NexGen’s 2025 Site Program (the “Program”) at its 100%-owned Rook I Property in the Athabasca Basin, Saskatchewan. The Program includes the establishment of a temporary exploration airstrip, expansion of the exploration accommodation camp facilities by 373 beds and site access road improvements.

The Program will commence in the coming weeks and conclude with camp commissioning in Q1 2026. This program builds on NexGen’s disciplined, strategic approach to implementing infrastructure enhancements required to support the Company’s exploration programs at PCE and that forecast across NexGen’s dominant land package in northwestern Saskatchewan into the future.

The drill results of high-grade basement hosted mineralization discovered at PCE 3.5km east from the Arrow deposit indicate another significant scale zone “Arrow style” of mineralization is materializing and warrant these infrastructure enhancements incorporating best practice safety and environmental principles.

Incorporating NexGen’s longstanding approach to economic capacity building, the Program will prioritize Local Priority Area participation, generating new employment and contracting opportunities for Indigenous and community members, reflecting NexGen’s industry leading and genuine approach to local communities.

Leigh Curyer, Founder and Chief Executive Officer, commented: “The 2025 Site Program marks an exciting strategic milestone for our current and future activities, with key infrastructure improvements that will optimize safety, environmental protection, and efficiency for our people and our programs. These infrastructure enhancements create the conditions for a high-performing operational platform capable of fully evaluating the significant resource potential across our Rook I Property. This Program is a direct reflection of NexGen’s proactive approach to responsible resource development, elite planning and demonstrates our continued commitment to building lasting value while creating meaningful opportunities for local Indigenous and community members.”

The Honourable Premier of Saskatchewan Scott Moe, commented: “I congratulate and thank NexGen for their major investment in Saskatchewan to date. The Rook I Project is one of the most significant projects across the country and we are keen to see it prioritized by the Government of Canada accordingly. Our government is proud to approve these infrastructure activities which are well within our jurisdiction and that are scheduled to commence imminently. NexGen is an example of strategically delivering a generational opportunity for Saskatchewan to become the world’s leader in the mining of uranium, and I look forward to working with newly elected Prime Minister Mark Carney to expedite the final Federal approval of this generational opportunity for Saskatchewan and Canada.”

2025 Site Program Overview

Temporary Exploration Airstrip

• Establishment of a gravel exploration airstrip (<1,000m) on the Rook I Property to enhance health and safety of workers and accommodate an increase in the regional exploration program, augmenting emergency response capabilities and human and environmental protection through the reduction of vehicular transportation of personnel to site.

Expansion of Temporary Exploration Camp Facilities

• Engineering, procurement, and installation of hard-walled modular facilities to accommodate 373 additional beds, ensuring the site can house and service the expanded technical teams and specialized personnel as exploration activities intensify.

Site Access Improvements

• Improvements to the 13 km Rook I access road to enhance overall worker and equipment safety, including widening the road surface to allow for safe, two-way traffic flow.
• Enhanced road base construction to support increased frequency of supply deliveries and specialized exploration equipment.

NexGen has the most significant land position in Saskatchewan’s southwest Athabasca Basin, where it holds over 190,000 hectares. From an exploration perspective, the Company is currently focused on the continued material growth of mineralization at PCE – located just 3.5 km east of the world-class Arrow Deposit. Planning is already underway for potential future programs at PCE as the balance of the 2025 drilling program is preparing to recommence in June.

About NexGen

NexGen Energy is a Canadian company focused on delivering clean energy fuel for the future. The Company’s flagship Rook I Project is being optimally developed into the largest low cost producing uranium mine globally, incorporating the most elite standards in environmental and social governance. The Rook I Project is supported by a NI 43-101 compliant Feasibility Study which outlines the elite environmental performance and industry leading economics. NexGen is led by a team of experienced uranium and mining industry professionals with expertise across the entire mining life cycle, including exploration, financing, project engineering and construction, operations and closure. NexGen is leveraging its proven experience to deliver a Project that leads the entire mining industry socially, technically and environmentally. The Project and prospective portfolio in northern Saskatchewan will provide generational long-term economic, environmental, and social benefits for Saskatchewan, Canada, and the world.

NexGen is listed on the Toronto Stock Exchange, the New York Stock Exchange under the ticker symbol “NXE” and on the Australian Securities Exchange under the ticker symbol “NXG” providing access to global investors to participate in NexGen’s mission of solving three major global challenges in decarbonization, energy security and access to power. The Company is headquartered in Vancouver, British Columbia, with its primary operations office in Saskatoon, Saskatchewan.

Forward-Looking Information

The information contained herein contains “forward-looking statements” within the meaning of applicable United States securities laws and regulations and “forward-looking information” within the meaning of applicable Canadian securities legislation. “Forward-looking information” includes, but is not limited to, statements with respect to mineral reserve and mineral resource estimates, the 2021 Arrow Deposit, Rook I Project and estimates of uranium production, grade and long-term average uranium prices, anticipated effects of completed drill results on the Rook I Project, planned work programs, completion of further site investigations and engineering work to support basic engineering of the project and expected outcomes. Generally, but not always, forward-looking information and statements can be identified by the use of words such as “plans”, “expects”, “is expected”, “budget”, “scheduled”, “estimates”, “forecasts”, “intends”, “anticipates”, or “believes” or the negative connotation thereof or variations of such words and phrases or state that certain actions, events or results “may”, “could”, “would”, “might” or “will be taken”, “occur” or “be achieved” or the negative connotation thereof. Statements relating to “mineral resources” are deemed to be forward-looking information, as they involve the implied assessment that, based on certain estimates and assumptions, the mineral resources described can be profitably produced in the future.

Forward-looking information and statements are based on the then current expectations, beliefs, assumptions, estimates and forecasts about NexGen’s business and the industry and markets in which it operates. Forward-looking information and statements are made based upon numerous assumptions, including among others, that the mineral reserve and resources estimates and the key assumptions and parameters on which such estimates are based are as set out in this news release and the technical report for the property , the results of planned exploration activities are as anticipated, the price and market supply of uranium, the cost of planned exploration activities, that financing will be available if and when needed and on reasonable terms, that third party contractors, equipment, supplies and governmental and other approvals required to conduct NexGen’s planned exploration activities will be available on reasonable terms and in a timely manner and that general business and economic conditions will not change in a material adverse manner. Although the assumptions made by the Company in providing forward looking information or making forward looking statements are considered reasonable by management at the time, there can be no assurance that such assumptions will prove to be accurate in the future.

Forward-looking information and statements also involve known and unknown risks and uncertainties and other factors, which may cause actual results, performances and achievements of NexGen to differ materially from any projections of results, performances and achievements of NexGen expressed or implied by such forward-looking information or statements, including, among others, the existence of negative operating cash flow and dependence on third party financing, uncertainty of the availability of additional financing, the risk that pending assay results will not confirm previously announced preliminary results, conclusions of economic valuations, the risk that actual results of exploration activities will be different than anticipated, the cost of labour, equipment or materials will increase more than expected, that the future price of uranium will decline or otherwise not rise to an economic level, the appeal of alternate sources of energy to uranium-produced energy, that the Canadian dollar will strengthen against the U.S. dollar, that mineral resources and reserves are not as estimated, that actual costs or actual results of reclamation activities are greater than expected, that changes in project parameters and plans continue to be refined and may result in increased costs, of unexpected variations in mineral resources and reserves, grade or recovery rates or other risks generally associated with mining, unanticipated delays in obtaining governmental, regulatory or First Nations approvals, risks related to First Nations title and consultation, reliance upon key management and other personnel, deficiencies in the Company’s title to its properties, uninsurable risks, failure to manage conflicts of interest, failure to obtain or maintain required permits and licences, risks related to changes in laws, regulations, policy and public perception, as well as those factors or other risks as more fully described in NexGen’s Annual Information Form dated March 6, 2024 filed with the securities commissions of all of the provinces of Canada except Quebec and in NexGen’s 40-F filed with the United States Securities and Exchange Commission, which are available on SEDAR at www.sedar.com and Edgar at www.sec.gov .

Although the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in the forward-looking information or statements or implied by forward-looking information or statements, there may be other factors that cause results not to be as anticipated, estimated or intended. Readers are cautioned not to place undue reliance on forward-looking information or statements due to the inherent uncertainty thereof.

There can be no assurance that forward-looking information and statements will prove to be accurate, as actual results and future events could differ materially from those anticipated, estimated or intended. Accordingly, readers should not place undue reliance on forward-looking statements or information. The Company undertakes no obligation to update or reissue forward-looking information as a result of new information or events except as required by applicable securities laws.

NexGen Energy Ltd. (TSX: NXE) (NYSE: NXE) (ASX: NXG) (“NexGen” or the “Company”) is thrilled to announce the Company’s best discovery phase assay results, with 15.0 meters (m) at 15.9% U₃O₈, including a peak intercept of 0.5 m at an exceptional 68.8% U₃O₈, in drillhole RK-25-232. Included within this phenomenal intercept is 3.0 m at 47.8% U₃O₈ and 1.5 m at 29.4% U₃O₈. This result ranks among the highest-grade basement hosted uranium vein intercepts in the world.

Assay results from two of the best holes drilled to date at PCE, RK-24-222 and RK-25-232, indicate intense high-grade mineralization 200 m apart (Figures 1 and 2, Tables 1 and 2), confirming scale and continuity early in the discovery phase. Winter activity since the last update continued to build momentum, adding 9 new intersections of off-scale (>61,000 cps) mineralization, bringing the total to 13 high-grade intercepts and reinforce confidence in the materiality of this emerging mineralization. Since discovery (see March 11, 2024, news release), 64 drillholes totalling 47,425.9 m have been completed, with 35 intersecting mineralization that remains open in most directions.

Further, RK-24-222 returned 17.0 m at 3.85% U₃O₈ including 3.0 m at 10.1% U₃O₈ and an intercept of 0.5 m at 28.2% U₃O₈ within massive replacement style uranium mineralization. These results are accelerating NexGen’s understanding of the PCE system and shaping the next phase of exploration targeting. Assays at SRC lab continue to see backlogs with NexGen now having received 75% of the 2024 assay results. Remaining will follow as they are received back from the independent lab. Drilling at PCE will resume on June 1st, 2025, and reporting of 2025 assays will be completed on an ongoing basis.

Leigh Curyer, Chief Executive Officer, commented: “Patterson Corridor East has delivered these exceptional assay results. RK-25-232 is an exceptionally high calibre intersection considering the program is very early in the evaluation of PCE.

Identical to Arrow, mineralization at PCE is wholly hosted in competent basement rock and exhibits all the same characteristics of an intense high-grade mineralized system. PCE is only 3.5 km from the future Rook I Project that is in the final Federal approval stage with the CNSC having received Provincial Approval in November 2023.

The scale of 2025 program drilling at PCE underscores NexGen’s commitment to advancing new sources of uranium supply at a time the world is committing to the deployment of nuclear energy. Notably, President Trump last Thursday, signing four executive orders to immediately accelerate the deployment of nuclear energy in the US, with objective of increasing US nuclear energy output from 100GW to 400GW by 2050. The importance of Rook I and the further development of PCE has never been greater to meet the world’s nuclear fuel requirements for the approaching decades.”

Jason Craven, Vice President, Exploration, commented: “These assays received to date confirm advancement of our 3D model of PCE which sets us up for targeting future drill hole locations at PCE. The focus to both expand the overall footprint as well as define and expand the high-grade sub-domains within PCE. Mineralization style and intensity, mirrored with Arrow 3.5 km away, speaks to the broader endowment of the underexplored NexGen portfolio in southwest Athabasca Basin. NexGen provides everyone with the tremendously unique opportunity of building a true tier one mine whilst simultaneously developing the exciting PCE.”

Other Highlights

• RK-24-207 returned 9.5 m at 2.91% U₃O₈ including 0.5 m at 28.2% U₃O_8, located approximately 79 m from RK-25-232 and 82 m from RK-24-222.

• RK-25-239 and RK-25-244 intersected 10.3 m containing >10,000 cps including 1.1 m of cumulative >61,000 cps, and 7.5 m containing >10,000 cps including 2.6 m of cumulative >61,000 cps, respectively. Although assays are pending, RK-25-239 and RK-25-244 speak to the consistency of the system and repeatability of uranium mineralization that is further substantiated by the exceptional assay results of RK-25-232 and RK-24-207.

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Table 1: 2025 Assay results received since March 24, 2025 news release to present

• All depths and intervals are meters downhole, true thicknesses are yet to be determined.
• Unconformity of ‘N/A’ denotes a lack of visible contact between Athabasca sandstone and basement rock.
• Maximum internal dilution 2.0 m downhole.
• Minimum thickness of 0.5 m downhole.
• Cutoff grade 0.01% U₃O₈.
• All depths and intervals are metres downhole, true thicknesses are yet to be determined. Resource modelling in conjunction with an updated mineral resource estimate is required before true thicknesses can be determined.

Table 2: 2024 Assays received since May 29, 2024

• All depths and intervals are meters downhole, true thicknesses are yet to be determined.
• Unconformity of ‘N/A’ denotes a lack of visible contact between Athabasca sandstone and basement rock.
• Maximum internal dilution 2.0 m downhole.
• Minimum thickness of 0.5 m downhole.
• Cutoff grade 0.01% U₃O₈.
• All depths and intervals are meters downhole, true thicknesses are yet to be determined. Resource modelling in conjunction with an updated mineral resource estimate is required before true thicknesses can be determined.

Table 4: 2025 Spectrometer results from March 24, 2025 news release to present