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NexGen Announces the Appointment of Ben Salter as Chief Financial Officer & Tracy Primeau as Special Advisor

Management Changes

NexGen Announces the Appointment of Ben Salter as Chief Financial Officer & Tracy

Primeau as Special Advisor

Vancouver, BC, August 29, 2023 - NexGen Energy Ltd. ("NexGen" or the "Company") (TSX: NXE)

(NYSE: NXE) (ASX: NXG) is pleased to announce the appointment of Ben Salter as Chief Financial Officer

(“CFO”), effective September 1, 2023. Mr. Salter commenced with NexGen in June 2021 and currently

holds the role of Vice President, Finance. He has extensive experience in fin ancial reporting, regulatory

compliance, internal controls, and corporate finance activities. Mr. Salter is a Chartered Professional

Accountant and holds a Bachelor of Commerce from the University of Victoria. Prior to NexGen, Mr. Salter

worked at Methane x Corporation and Innergex Renewable Energy Inc. (previously Alterra Power Corp.)

where he was responsible for financial reporting, controls and systems. Mr. Salter will assume the CFO

position upon the resignation of Harpreet Dhaliwal who is pursuing other career interests.

Leigh Curyer, Chief Executive Officer, commented: “Ben has been an important part of NexGen’s growth

journey, and has consistently demonstrated exceptional commitment to the Company. His extensive

knowledge of NexGen’s financial landscape and requirements, combined with strong leadership abilities,

make him the ideal candidate for the role of CFO, and positions the Company for an expansion. The entire

NexGen leadership team and the Board of Directors would like to thank Harpreet for her valuable

contributions during her time with the Company. Harpreet play ed a significant role in implementing key

financial systems.”

In addition, the Company is delighted to welcome Tracy Primeau as a Special Advisor specializing in

community. With an extensive background in nuclear energy, Tracy's journey began at Ontario Po wer

Generation's Pickering Nuclear Power Station, leading her to become one of the few women to attain a

Canadian Nuclear Safety Commission (“CNSC”) license at Bruce Power and its sole female Shift Manager.

A dedicated board member of both Ontario Power Ge neration and Women in Nuclear (“WiN”) Canada,

Tracy's commitment extends beyond the industry, notably as an influential mentor, active community

participant, and proud Nipissing First Nation member. Her leadership, rooted in the Seven Grandfather

Teachings, continues to inspire change and education on climate and Indigenous knowledge.

Mr. Curyer commented: "On behalf of the Board and Executive, it is a privilege to have Tracy join us at this

exciting pivotal stage in the Company’s development. Her vast experience and aligned values with respect

to genuine community engagement and advancement will further compliment NexGen’s demonstrated

commitment in driving transformative change for all stakeholders.”

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 en tire 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.

Contact Information

Leigh Curyer

Chief Executive Officer

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

Travis McPherson

Chief Commercial Officer

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

Monica Kras

Vice President, Corporate Development

+44 (0) 7307 191933

[email protected]

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 ur anium 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 pr oject 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 bas ed 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 materi al

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 th e 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 Cana dian 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 main tain 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 February 24, 2023 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 forwa rd-

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 p lace 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.