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NexGen Achieves Major Permitting Milestone

Permits & Approvals

NexGen Achieves Major Permitting Milestone

• The Canadian Nuclear Safety Commission (“CNSC”) has notified NexGen of successful completion of

final Federal technical review.

• This is the key requirement to scheduling a Federal Commission Hearing date and subsequent Federal

Project approval decision.

• The Federal Environmental Assessment (“EA”) and License represent the final major approval steps

after having received Provincial EA approval in November 2023.

• In production, the Rook I Project is poised to make NexGen one of the world's largest and most

environmentally conscious mining companies.

Vancouver, BC, November 19, 2024 – NexGen Energy Ltd. (“NexGen” or the “Company”) (TSX: NXE) (NYSE:

NXE) (ASX: NXG) is excited and proud to announce a major milestone in the Federal EA process for its 100%-

owned Rook I Project (“the Project”). The CNSC has provided NexGen formal confirmation that the Company has

successfully addressed all information requests received as part of the Federal technical review. With completion

of the CNSC technical review, the next and final steps in the Federal approval process include scheduling a

Commission Hearing Date for the Project, subject to which the CNSC will render an approval decision on the

Project.

This historic milestone marks a crucial step forward for the Project that has been undergoing Canada’s robust and

rigorous regulatory process since 2019. Completion of the Federal EA technical review stage follows the CNSC

having deemed NexGen’s Federal licence application sufficient in September 2023, and receipt of Provincial EA

approval in November 2023. This development reinforces Canada's path to re-establish itself as the leader in global

uranium supply and partner of choice.

Leigh Curyer, Chief Executive Officer, commented: "This exciting outcome is a testament to the exceptional efforts

of our entire NexGen team, the collaborative support of our valued Indigenous Nation partners, and our transparent

approach with the CNSC to ensure a robust and thorough review that meets the highest standards of

environmental protection for the sustainable development of the Rook I Project. Since inception, our honest and

innovative holistic approach to the successful development of this generational project has set new industry

standards as to what is possible, whilst positively impacting all our valued stakeholders.

Together with the Clearwater River Dene Nation, Métis Nation – Saskatchewan Northern Region 2 and Métis Nation

– Saskatchewan, Buffalo River Dene Nation, and Birch Narrows Dene Nation, we are construction ready to deliver

transformative and unprecedented social, economic and environmental benefits to local communities, the Province

of Saskatchewan, Canada, and the world.

We're not just developing a mine - we're building strong communities while shaping a sustainable and secure

global energy future. With over $800 million in cash and liquid assets, we are ready pending a positive Commission

decision with all activities required to immediately commence major site works in place."

NexGen is poised to propel Canada back to the forefront of global clean energy fuel production. The Rook I Project

embodies NexGen's commitment to elite environmental performance, unprecedented community inclusion, and

responsible alignment with global net-zero goals.

This is a Designated News Release

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 and 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.

For additional information and media inquiries:

Leigh Curyer

Chief Executive Officer

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

www.nexgenenergy.ca

Travis McPherson

Chief Commercial Officer

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

Monica Kras

Vice President, Corporate Development

NexGen Energy Ltd.

+44 (0) 7307 191933

[email protected]

Cautionary Note to U.S. Investors

This news release includes Mineral Reserves and Mineral Resources classification terms that comply with reporting

standards in Canada and the Mineral Reserves and the Mineral Resources estimates are made in accordance with NI

43-101. NI 43-101 is a rule developed by the Canadian Securities Administrators that establishes standards for all public

disclosure an issuer makes of scientific and technical information concerning mineral projects. These standards differ

from the requirements of the Securities and Exchange Commission ("SEC") set by the SEC's rules that are applicable to

domestic United States reporting companies. Consequently, Mineral Reserves and Mineral Resources information

included in this news release is not comparable to similar information that would generally be disclosed by domestic U.S.

reporting companies subject to the reporting and disclosure requirements of the SEC Accordingly, information

concerning mineral deposits set forth herein may not be comparable with information made public by companies that

report in accordance with U.S. standards.

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 estimates for CapEx,

OpEx and a payback period of 12 months, the appointment of a lead lender group, the availability of financing for the

Project, the advancement of detailed engineering and contract negotiations, bolstering the globe’s uranium supply chains

to meet the rising demand for nuclear energy, the timing and cost of reclamation, including as part of the UGTMF and

after-tax free cash flow remaining materially consistent with the FS, Free Cash Flow, Payback Period and IRR relative to

various uranium prices, 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”, “estimate s”, “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 achiev ed” 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 financing for the Project

will be available in a timely manner and on terms acceptable to the Company, 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 and updated/revised CapEx, OpEx,

SusEx, and pay back period; 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, de velopment 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.

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 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.