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NexGen Signs Industry-Leading Impact Benefit Agreement with the Métis Nation – Saskatchewan Northern Region 2 and the Métis Nation – Saskatchewan. This is a designated news release.

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NexGen Signs Industry-Leading Impact Benefit Agreement with the Métis Nation –

Saskatchewan Northern Region 2 and the Métis Nation – Saskatchewan.

This is a designated news release.

VANCOUVER, BC, June 15, 2023 – NexGen Energy Ltd. ("NexGen" or the "Company") (TSX: NXE)

(NYSE: NXE) (ASX: NXG) is pleased to announce the signing of an Impact Benefit Agreement ("IBA" or the

“Agreement”) with the Métis Nation – Saskatchewan Northern Region 2 (“MN-S NR2") and the Métis Nation

– Saskatchewan ("MN-S"), covering all phases of the Rook I Project ("Rook I" or the "Project"), which hosts

the 100% owned Arrow uranium deposit.

The signing of an IBA with the MN -S follows the signing of Benefit Agreements with each of the

Clearwater River Dene Nation (“CRDN”), Birch Narrows Dene Nation (“BNDN”), and Buffalo River

Dene Nation (“BRDN”) . These four Nations collectively represent the First Nation and M étis

communities for which the Saskatchewan Ministry of Environment assigned procedural aspects of

the Duty to Consult for the Project to NexGen, and which have been identified by NexGen as the

primary Indigenous Nations for consultation in consideration of the federal requirements of the

Canadian Nuclear Safety Commission (“CNSC”).

NexGen signs an historic IBA with the MN-S NR2 and the MNS. The Project is located within an area to

which the MN-S NR2, as represented by the MN-S, assert constitutionally protected Aboriginal rights and

interests, including Métis title, over certain lands and resources (“Rights”). The IBA defines the

environmental, cultural, economic, employment , and other benefits to be provided to the MN-S NR2 and

the MN-S by NexGen in respect of the Project, and to confirm the consent and support of the MN-S NR2

and the MN-S for the Project throughout its complete lifecycle, including reclamation. The Agreement was

negotiated and developed out of a Study Agreement that was signed in 2019 between NexGen , the MN-S

NR2, and the MN-S. The Study Agreement formalized engagement with the MN-S NR2 to identify potential

impacts to Aboriginal rights and socio -economic interests and identify potential avoidance and

accommodation measures in relation to the Project, whilst acknowledging the duty to consult remains with

the Crown. Further, the Study Agreement provided the MN-S NR2 and the MN-S support to negotiate the

IBA. Note, the IBA does not define or amend, recognize, affirm, abrogate, derogate from, or deny the

existence of, or in any way limit any Rights of the MN-S NR2 and the MN -S, but rather is entered into in

recognition of such Rights.

Leigh Curyer, Chief Executive Officer of NexGen, commented: “The signing of this agreement is a

testament to the trust and respect that has been established between NexGen, the MN-S NR2 and the MN-

S to work in partnership with the mutual objective of responsibly developing the Rook I Project. I would like

to acknowledge and thank Leonard Montgrand, his board and the entire MN-S engagement team for their

diligence and commitment toward finalizing this industry -leading Agreement alongside NexGen for the

benefit of their membership.

“This is a significant moment in the Project’s history. Signing the fourth commu nity and final Benefit

Agreement to ensure sustainable generational impact through positive social, economic, and transparent

environmental outcomes that will extend well beyond mine-dependent opportunities for all communities in

the Local Priority Area, the Province of Saskatchewan, and Canada. I am extremely proud of the dedication

and commitment of the NexGen organization and all four communities to collaboratively design and

implement a new industry -leading approach and structure to genuine consultation and engagement. The

template of which, we are offering to share Canada -wide to other communities and organizations

collaborating on the successful development and implementation of projects.”

Leonard Montgrand, Regional Director of MN-S Northern Region II commented: “This agreement is a

milestone in the history of the Métis Nation. It not only recognizes the Métis as a rights -holding people

with strong ancestral connections to the land, but also provides a mechanism for continuous engagement

on a breadth of important topics, including environmental and social concerns, human resources, and

support for Métis businesses. After a century of our lands being developed without consideration of our

people, it was important to come together as one Region a nd one Nation to change the status quo and

become a partner in the development of the Rook I Project. NexGen’s commitments in the IBA will set a

new standard for how industry recognizes Métis rights and engages with the Métis Nation. ”

Glen McCallum, President of the Métis Nation -Saskatchewan commented: “I wish to congratulate

Northern Region II and NexGen for all the work involved in resolving the IBA, a landmark agreement for the

entire Métis Nation and an excellent example of what can be a chieved when we work together. Over the

past five years, the Métis Nation-Saskatchewan has had a string of transformative accomplishments many

thought impossible, and to this list we are proud to add the IBA with NexGen. It is our understanding this

will be, by far, the largest Métis impact and benefit agreement in Canadian history. Under the IBA, the Rook

I Project will respect our large, vibrant Métis community and our rights and interests over the land,

while providing much-needed resources and opportunities to Northern Region II. It will leave a substantial

legacy that can continue after the mine has closed and the lands have been restored.”

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 co mpliant 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 expl oration, 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 s ymbol

“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]

www.nexgenenergy.ca

Travis McPherson

Chief Commercial Officer

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

http://www.nexgenenergy.ca

Monica Kras

VP, Corporate Development

+44 7307 191933

[email protected]

http://www.nexgenenergy.ca

Technical Disclosure

All technical information in this news release has been reviewed and approved by Kevin Small, 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 NexGen Energy's website

(www.nexgenenergy.ca ).

Cautionary Note to U.S. Investors

This news release includes Mineral Reserves and Mineral Resources classification terms th at 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 publ ic 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 repo rting 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. "Forwa rd-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, anti cipated

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 min eral 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 assa y 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 mor e 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 varia tions 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 diff er

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 c ould 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 a s a result of new

information or events except as required by applicable securities laws.