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NexGen Releases 2023 Sustainability Report

Corporate Updates

NexGen Releases 2023 Sustainability Report

Vancouver, BC, May 22, 2024 - NexGen Energy Ltd. ("NexGen" or the "Company") (TSX: NXE) (NYSE:

NXE) (ASX: NXG) is pleased to announce the release of its 2023 Sustainability Report ("the Report") that

covers the period January 1, 2023 to December 31, 2023. The Report marks the fourth year that NexGen

has reported on the Company's robust Environmental, Social , and Governance (ESG) profile, and is again

in accordance with the Global Reporting Initiative (GRI) Standards.

The Report is available online on the Company's website: 2023 Sustainability Report

Leigh Curyer, Chief Executive Officer, commented: "2023 was a pivotal and momentous year for NexGen,

driven by our unwavering focus on responsible resource development and advancement of the clean

energy transition, while delivering exceptional economic, environmental, and social outcomes for all of our

stakeholders including our community partners in Northern Saskatchewan. Our vision and values are firmly

embedded in all our business practices and decision -making processes, and our disciplined and genuin e

approach has always demonstrated that responsible development can and should coexist with

environmental and social well -being. We continue to build on past practices to set a new standard for the

industry, as we progress the Rook I Project, which is poised to deliver the most material, secure , and

sustainable source of uranium globally for a low-carbon future.

Highlights in the Report Include:

Historic Benefit Agreement and Nation Partner Support

NexGen signed a historic Impact Benefit Agreement with the Métis Nation – Saskatchewan Northern Region

2 (“MN -S NR2”) and the Métis Nation – Saskatchewan (“MN -S”), marking the fourth and final Benefit

Agreement with Local Priority Area Nations, and confirming full support from Indigenous communities local

to the Rook I Project.

Provincial Environmental Assessment Approval

NexGen made material regulatory advancements for the Rook I Project, becoming the first Company in over

20 years to receive Provincial Environmental Assessment approval for a greenfield uranium mine and mill

project in Canada, and paving the way for the Federal regulators who are in the final stages of approval of

the Federal Envrionmental Assessment.

Expanded Training and Education Programs

NexGen initiated and funded a first-ever innovative collaboration with local industry, educational institutions,

and local communities for trades training and certification. These inaugural programs build on the

Company’s longstanding focus on creating a strong and thriving workforce, with a total 302 students

participating across the Company’s expanded education and training initiatives throughout 2023.

Diverse Top-Tier Talent

NexGen’s unique and strong culture is one that promotes a diverse and safe work environment where all

individuals are treated with respect and dignity. NexGen has demonstrated a unique approach to driving

diversity through community development and training that encourages strong female participation. This,

combined with NexGen’s culture, has resulted in 80% of site employees residing in the local communities

including 33% being female in 2023. Further, with the nomination of Susannah Pierce to the Company’s

Board of Directors, NexGen will have 30% female representation on its Board.

Unprecedented Community and Mentorship Initiatives

NexGen created unique mentorship opportunities for local northern Saskatchewan youth, including the

Youth Mentorship Program with the Vancouver Canucks. A total of 32 youth chosen by their community in

recognition of their commitment to health, wellness, a nd community stewardship, were hosted for a once -

in-a-lifetime experience, including mentorship by each business segment within the organi zation, learning

from players and staff about the power of resilience and accountability – two of NexGen’s core values , as

well as paying tribute to Indigenous culture.

Economic Capacity Building

NexGen facilitated the establishment of a 100% Indigenous owned and operated gravel supply company in

northwestern Saskatchewan, focusing on economic development , employment and capacity building

opportunities, with the business employing up to 16 local people. This gravel crushing business is already

a success with significant economic value being generated for the local community.

Environmental Stewardship

NexGen undertook impactful environmental initiatives, gaining important learnings through continued

environmental monitoring and collaborative projects, including GHG inventory, water use and monitoring,

waste management, rock storage, biodiversity initiatives, and progressive reclamation. This is on top of the

truly exceptional environmental impact NexGen will have on global GHG emissions reduction efforts by

powering over 46 million homes annually whist removing 70 million car-equivalents of CO2 off the road each

year.

The Report has been prepared in accordance with the Global Reporting Initiative (GRI) Standards 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 standard s 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 en tire 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 envir onmentally. 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 so lving 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]

www.nexgenenergy.ca

Travis McPherson

Chief Commercial Officer

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

http://www.nexgenenergy.ca

Monica Kras

Vice President, Corporate Development

+44 7307 191933

[email protected]

http://www.nexgenenergy.ca

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 dril l 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 m ade 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 contr actors, 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, eq uipment 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 i n 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 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 forward -

looking information or statements, there may b e 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 reli ance 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.