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NexGen Commences Expanded 43,000 Meter Drill Program at Patterson Corridor East

Exploration Programs

NexGen Commences Expanded 43,000 Meter Drill Program at Patterson Corridor East

Vancouver, BC, January 30, 2025 - NexGen Energy Ltd. ( "NexGen" or the "Company") (TSX: NXE)

(NYSE: NXE) (ASX: NXG) is excited to announce the commencement of a 43,000 meter (m) exploration

drill program to continue to test the extents and growth of mineralization discovered in early 2024 at

Patterson Corridor East (PCE) located 3.5 km east of the world -class Arrow Deposit . This systematic

program represents an increase of 9,000 m from the 2024 program and is expected to be one of the largest

drill programs in the Athabasca Basin, Saskatchewan in 2025. The initial results at PCE revealed vein-type

uranium mineralization intersected within the competent basement rock, highly analogous to Arrow. Since

discovery, the mineralized footprint at PCE has rapidly grown to 600 m along strike and 600 m of vertical

extent (see November 12, 2024 news release).

Drilling in 2025 will focus on testing extents of the mineralized footprint , further investigating high -grade

zones within the broad mineralized footprint , and determining potential for additional mineralization within

the same target area (Figure 1). Since discovery and over the 2024 campaign 19 of the 30 initial holes

intersected mineralization with 10 intersecting intermittent widths of high grade of >10,000 cps

mineralization. In addition, strategic use of geophysics will cover prospective areas on SW3 to refine a

growing inventory of drill ready targets across NexGen’s dominant southwest Athabasca Basin land position.

Assays for 2024 drilling will be reported once fully received in Q1 2025.

Leigh Curyer, Chief Executive Officer, commented: “In early 2024 , we launched a bold grass roots

exploration program aimed at discovering new uranium resources to address the material and growing

uranium demand / supply gap. NexGen’s disciplined and systematic approach to evaluating high -priority

targets resulted in the discovery and material growth of mineralization at PCE. This highly prospective area

continues to be the central focus of our exploration efforts given the clear potential demonstrated to date

at PCE. This is a strategic focus to contribute sustainable supply to the growing demand for uranium to fuel

the global energy needs."

Jason Craven, Vice President, Exploration, commented: “The scale of this year’s drill program speaks to

our excitement for PCE and a commitment to efficiently and thoroughly assess it. Continuity of

mineralization, as well as intensity of high-grade mineralization and alteration, indicate a system with strong

potential for continued growth. These are compelling early days at PCE where we will remain solely focused

on unlocking its full potential.”

With over $800M in cash and liquid assets, NexGen is optimally funded for the ongoing development of the

Rook I Project as well as the PCE exploration program and for general corporate purposes.

Figure 1: PCE area with drilling to date and relative location to Arrow. The primary target area (shown in green) outlines

where testing for high-grade expansion and footprint extents will focus.

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 environmental and social governance standards. The Rook I

Project is supported by an N.I. 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, 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]

www.nexgenenergy.ca

Travis McPherson

Chief Commercial Officer

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

www.nexgenenergy.ca

Monica Kras

Vice President, Corporate Development

NexGen Energy Ltd.

[email protected]

www.nexgenenergy.ca

Technical Disclosure*

All technical information in this news release has been reviewed and approved by Jason Craven, NexGen's

Vice President, Exploration, a qualified person under National Instrument 43-101.

Natural gamma radiation in drill core reported in this news release was measured in counts per second

(cps) using a Radiation Solutions Inc. RS-125 gamma spectrometer. The reader is cautioned that total count

gamma readings may not be directly or uniformly related to uranium grades of the rock sample measured;

they should be used only as a preliminary indication of the presence of radioactive minerals.

A technical report in respect of the FS is filed on SEDAR + (www.sedarplus.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 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 a re 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 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 support basic engineering of the project and expect ed 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 March 6, 2024 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 Se curities and Exchange Commission, which are available on SEDAR +

at www.sedarplus.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.