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Denison Negotiates Repayment of Debt Owing from Uranium Industry A.s. and Receives Initial US$2 Million Payment

Financings Debt & Credit Facilities

Denison Mines Corp.

1100 – 40 University Ave

Toronto, ON M5J 1T1

www.denisonmines.com

PRESS RELEASE

DENISON NEGOTIATES REPAYMENT OF DEBT OWING FROM

URANIUM INDUSTRY A.S. AND RECEIVES INITIAL US$2 MILLION PAYMENT

Toronto, ON – Jan 13, 2022. Denison Mines Corp. (“Denison” or the “Company”) ( TSX: DML, NYSE

American: DNN ) is pleased to announce that it has executed a Repayment Schedule Agreement (the

“Agreement”) with Uranium Industry a.s. (“UI”), pursuant to which the parties have negotiated the repayment

of the debt owing from UI to Denison, and that Denison has received an initial US$2 million debt repayment

instalment in accordance with the terms of the Agreement.

In July 2020, Denison announced the receipt of a final award in favour of Denison from the London Court

of International Arbitration (“LCIA”) with respect to the arbitration proceedings between the Company and

UI related to the 2015 sale by Denison to UI of its mining assets and operations located in Mongolia

(“Arbitration Award”). The arbitration panel declared that UI violated its obligations to the Company under

the related agreements and ordered UI to pay the Company USD$10 million plus interest at a rate of 5%

per annum from November 16, 2016, plus certain legal and arbitration costs.

Under the terms of the Agreement, UI has agreed to make scheduled payments on account of the

Arbitration Award, plus additional interest and fees, through a series of quarterly installments and annual

milestone payments, until December 31, 2025 . The total amount due to Denison under the Agreement,

including the initial US$2 million already received, is approximately US$16 million. The Agreement includes

customary covenants and conditions in favour of Denison, including certain restrictions on UI’s ability to

take on additional debt, in consideration for Denison’s deferral of enforcement of the Arbitration Award while

UI is in compliance with its obligations under the Agreement.

This press release constitutes a "designated news release" for the purposes of the Company's prospectus

supplement dated September 28, 2021 to its short form base shelf prospectus dated September 16, 2021.

About Denison

Denison is a uranium exploration and development company with interests focused in the Athabasca Basin

region of northern Saskatchewan, Canada. The Company has an effective 95% interest in its flagship

Wheeler River Uranium Project, which is the largest undeveloped uranium project in the infrastructure rich

eastern portion of the Athabasca Basin region of northern Saskatchewan. Denison's interests in

Saskatchewan also include a 22.5% ownership interest in the McClean Lake joint venture, which includes

several uranium deposits and the McClean Lake uranium mill that is contracted to process the ore from the

Cigar Lake mine under a toll milling agreement, plus a 25.17% interest in the Midwest Main and Midwest A

deposits, and a 66.90% interest in the Tthe Heldeth Túé ("THT," formerly J Zone) and Huskie deposits on

the Waterbury Lake property. Each of Midwest Main, Midwest A, THT and Huskie are located within 20

kilometres of the McClean Lake mill.

Through its 50% ownership of JCU (Canada) Exploration Company, Limited (“JCU”), Denison also hold s

interests in various uranium project joint ventures in Canada, including the Millennium project (JCU

30.099%), the Kiggavik project (JCU 33.8123%) and Christie Lake (JCU 34.4508%).

Denison is also engaged in mine decommissioning and environmental servic es through its Closed Mines

group (formerly Denison Environmental Services), which manages Denison's Elliot Lake reclamation

projects and provides third-party post-closure mine care and maintenance services.

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For more information, please contact

David Cates (416) 979-1991 ext 362

President and Chief Executive Officer

Mac McDonald (416) 979-1991 ext.242

Exec. Vice President & Chief Financial Officer

Follow Denison on Twitter @DenisonMinesCo

Cautionary Statement Regarding Forward-Looking Statements

Certain information contained in this news release constitutes ‘forward-looking information’, within the meaning of the applicable United

States and Canadian legislation concerning the business, operations and financial performance and condition of Denison.

Generally, these forward -looking statements can be identified by the use of forward -looking terminology such as ‘plans’, ‘expects’,

‘budget’, ‘scheduled’, ‘estimates’, ‘forecasts’, ‘intends’, ‘anticipates’, or ‘believes’, or the negatives and/or variations of such words and

phrases, or state that certain actions, events or results ‘may’, ‘could’, ‘would’, ‘might’ or ‘will be taken’, ‘occur’, ‘be a chieved’ or ‘has

the potential to’. In particular, this news release contains forward-looking information pertaining to the Agreement and the expectations

of scheduled repayment of the Arbitration Award pursuant thereto; expectations regarding its joint venture ownership interests ; and

the continuity of its agreements with third parties.

Forward looking statements are based on the opinions and estimates of management as of the date such statements are made, and

they are subject to known and unknown risks, uncertainties and other factors that may cause the actual resu lts, level of activity,

performance or achievements of Denison to be materially different from those expressed or implied by such forward -looking

statements. For example, the execution and initial repayment under the Agreement may not lead to recovery of further repayments.

Denison believes that the expectations reflected in its forward-looking information are reasonable but no assurance can be given that

these expectations will prove to be accurate and results may differ materially from those anticipated in this forward-looking information.

For a discussion in respect of risks and other factors that could influence forward-looking events, please refer to the factors discussed

in Denison’s Annual Information Form dated March 26, 2021 or subsequent quarterly financial reports under the heading ‘Risk

Factors’. These factors are not, and should not be construed as being, exhaustive.

Accordingly, readers should not place undue reliance on forward -looking statements. The forward -looking information contained in

this news release is expressly qualified by this cautionary statement. Any forward-looking information and the assumptions made with

respect thereto speaks only as of the date of this news release. Denison does not undertake any obligation to publicly update or revise

any forward-looking information after the date of this news release to conform such information to actua l results or to changes in

Denison's expectations except as otherwise required by applicable legislation.