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NexGen Releases 2021 Sustainability Report

Corporate Updates

NexGen Releases 2021 Sustainability Report

Vancouver, British Columbia, November 3, 2022 - NexGen Energy Ltd. ("NexGen" or the "Company")

(TSX/NYSE: NXE, ASX: NXG) is pleased to announce the release of its 2021 Sustainability Report (“the

Report”), available online on the Company’s website www.nexgenenergy.ca in the “Responsible

Development” section. The Report highlights specific programs, initiatives, and organizational frameworks

that NexGen has created or expanded upon to deliver as much positivity as possible for as many people as

possible.

Leigh Curyer, Chief Executive Officer commented: “ The principles of NexGen’s approach to sustainability

aren’t dependent on the stage of our development – it’s a focus that’s embedded into our daily business

decision making across the organization. The Report demonstrates seamless integration of sustainability

across all areas of people and project development, execution and operations , and long -term strategic

planning. It reflects NexGen’s ‘elite standards’ approach to everything we do and is a great insight into the

philosophy of how we’ve conducted our business since inception.”

Highlights in the Report:

Benefit Agreements: NexGen signed Benefit Agreements with the Buffalo River Dene Nation and Birch

Narrows Dene Nation covering all phases of the Rook I Project including closure, and formalizing NexGen’s

commitment to work in partnership with all local communities, with the m utual objective to responsibly

develop the Rook I Project. In early 2022 NexGen and the Clearwater River Dene Nation signed a third

Benefit Agreement.

Integrated Business and ESG Framework: NexGen introduced a structured Integrated Business and ESG

Framework to formally combine sustainability and ESG with the Company’s practices and decisions.

Greenhouse Gas (“GHG”) Emissions Inventory: In order to help understand the Company's impacts,

NexGen carried out a GHG Emissions Inventory for the period 2013 (since Company going public)-2021,

using the operational control approach with geographic boundaries set to include the Company’s Saskatoon

and Vancouver offices and the Rook I property.

Integrated Management System (“IMS”): NexGen implemented an IMS for all employees and contractors

with robust occupational health and safety processes and established a joint Occupational Health and Safety

Committee (“OHC”) for the Rook I site during field activities.

This is NexGen’s second Sustainability Report and covers the period January 1 to December 31, 2021 and

is prepared with reference to the Global Reporting Initiative (“GRI”) Standards. The Company will continue

reporting on an annual basis.

About NexGen

NexGen is a British Columbia corporation focused on the development of the Rook I Project located in the

southwestern Athabasca Basin, Saskatchewan, Canada, into production. The Rook I Project is supported

by a NI 43 -101 compliant Feasibility Study which outlines elite enviro nmental performance as well as

industry leading economics. Rook I hosts the Arrow Deposit that hosts Measured Mineral Resources

of 209.6 M lbs of U3O8 contained in 2.18 M tonnes grading 4.35% U3O8, Indicated Mineral Resources of 47.1

M lbs of U3O8 contained in 1.57 M tonnes grading 1.36% U3O8, and Inferred Mineral Resources of 80.7 M lbs

of U3O8 contained in 4.40 M tonnes grading 0.83% U3O8.

NexGen has a highly experienced team of uranium industry professionals with a successful track record in

the discov ery of uranium deposits and in developing projects through discovery to production. The

Company is the recipient of the 2018 PDAC Bill Dennis Award for Canadian mineral discovery and the 2019

PDAC Environmental and Social Responsibility Award.

Contact Information

Leigh Curyer

Chief Executive Officer

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

Travis McPherson

Senior Vice President Corporate Development

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

Technical Disclosure

All technical information in this news release has been reviewed and approved by Kevin Small, P.Eng.,

NexGen's Senior Vice President, Engineering and Operations, a qualified person under National Instrument

43-101.

A technical report in respect of the FS is filed on SEDAR ( www.sedar.com ) and EDGAR

(www.sec.gov/edgar.shtml ) and is available for review on Ne xGen Energy's website

(www.nexgenenergy.ca ).

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 inf ormation 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 mad e

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 "forw ard-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 supp ort 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", "forecast s", "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 ne gative 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 informat ion 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 conditi ons 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 diffe r

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 par ty 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 p arameters 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 inte rest, 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 February 25, 2022 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 impl ied 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.