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Denison Announces Results of Shareholder Meeting

Shareholder Meetings

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Denison Mines Corp.

1100 – 40 University Ave

Toronto, ON M5J 1T1

www.denisonmines.com

PRESS RELEASE

DENISON ANNOUNCES

RESULTS OF SHAREHOLDER MEETING

Toronto, ON – May 7 , 20 21. Denison Mines Corp. (“Denison” or the “Company”) (DML: TSX, DNN:

NYSE American) is pleased to report that the nominees listed in the management proxy circular dated

March 23, 2021 (the “Circular”) for the Annual General Meeting of Shareholders held yesterday in Toronto

(the "Meeting ") were elected as directors of the Company.

The Company is also pleased to report that all other items of business presented to its shareholders at

the Meeting, as more particularly described in the Circular, were approved.

Detailed results of the vote for the election of directors are set out below.

Nominee Votes For % For Votes Withheld % Withheld

David D. Cates 215,373,379 98.95 2,281,491 1.05

W. Robert Dengler 214,960,068 98.76 2,694,802 1.24

Brian D. Edgar 215,130,879 98.84 2,523,991 1.16

Ron F. Hochstein 165,957,889 76.25 51,696,981 23.75

Jun Gon Kim 215,935,313 99.21 1,719,557 0.79

David Neuburger 215,906,301 99.20 1,748,569 0.80

Jennifer Traub 215,444,377 98.98 2,209,594 1.02

Patricia M. Volker 215,797,396 99.15 1,857,474 0.85

The Board of Directors (the “Board”), on recommendation (after detailed review) of the Corporate

Governance & Nominating Committee, approved the individuals nominated to shareholders for election to

serve as directors of the Board and is confident of their suitability to serve on the Board and its

Committees. The Company was advised that proxy advisory firm Institutional Shareholder Services

(“ISS”) recommended a “withhold” vote against Mr. Hochstein, which is believed to have impacted the

voting results at the Meeting. According to their reporting, ISS has taken the position that Mr. Hochstein

is not independent due to his prior role as CEO of the Company 6 years ago. Mr. Hochstein has served

as President and CEO of Lundin Gold Inc. since 2014, resigning as CEO of the Company in March 2015.

Mr. Hochstein played an important role in the development of Denison during his tenure as CEO and

during that time acquired considerable specialized knowledge of the uranium mining industry – which

together with his breadth of technical and practical experience in the mining industry provides great value

to Denison. Since Mr. Hochstein’s resignation in 2015, the Company’s asset base, management team,

and strategy, have changed substantially. Accordingly, it is the position of the Board that Mr. Hochstein’s

prior executive positions with Denison do not interfere with his ability to exercise independent judgment

as a member of Denison’s Board.

The Company has provided more details on the results of all matters considered at the Meeting in its

Report of Voting Results filed under its profile on SEDAR at www.sedar.com and EDGAR at

www.sec.gov/edgar.

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About Denison

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

Basin region of northern Saskatchewan, Canada. The Company's flagship project is the 90% owned

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 ("MLJV"),

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.

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

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

projects and provides post-closure mine care and maintenance services to a variety of industry and

government clients.

Denison is the manager of Uranium Participation Corp., a publicly traded company which invests in

uranium oxide and uranium hexafluoride.

For more information, please contact

David Cates (416) 979-1991 ext. 362

President and Chief Executive Officer

Sophia Shane (604) 689-7842

Investor Relations

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 achieved’ or ‘has the potential to’.

In particular, this news release contains forward-looking information pertaining to the following: the composition of the

Denison Board; expectations regarding Denison’s 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 results, level of activity, performance or achievements of Denison to be materially different from those

expressed or implied by such forward-looking statements. Denison believes that the expectations reflected in this

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 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 actual results or to changes in Denison's expectations except as otherwise

required by applicable legislation.