Denison Announces Election of Directors

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Denison Mines Corp.

1100 – 40 University Ave

Toronto, ON M5J 1T1

www.denisonmines.com

@DenisonMinesCo

PRESS RELEASE

DENISON ANNOUNCES ELECTION OF DIRECTORS

Toronto, ON – May 4, 2017 Denison Mines Corp. (“Denison” or the “Company”) (DML: TSX, DNN: NYSE

MKT) is pleased to report that the nominees listed in the management proxy circular for the 201 7 Annual

Meeting of Shareholders ("Annual Meeting") were elected as directors of the Company. Detailed results of

the vote for the election of directors held at the Annual Meeting yesterday in Toronto are set out below.

Nominee Votes For % For Votes Withheld % Withheld

W. Robert Dengler 196,503,077 99.09% 1,799,599 0.91%

Brian D. Edgar 195,542,873 98.61% 2,759,803 1.39%

Ron F. Hochstein 166,106,335 83.76% 32,196,341 16.24%

Kwang Hee Jeong 196,483,382 99.08% 1,819,294 0.92%

Lukas H. Lundin 166,441,564 83.93% 31,861,112 16.07%

William A. Rand 196,397,136 99.04% 1,905,540 0.96%

Catherine Stefan 195,460,339 98.57% 2,842,337 1.43%

About Denison

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

Basin region of northern Saskatchewan. Including its 60% owned Wheeler River project, which hosts the

high-grade Phoenix and Gryphon uranium deposits, Denison's exploration portfolio consists of numerous

projects covering over 330,000 hectares in the infrastructure rich eastern Athabasca Basin. 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, which is currently

processing ore from the Cigar Lake mine under a toll milling agreement, plus a 25.17% interest in the

Midwest deposit and a 63.01% interest in the J Zone deposit on the Waterbury Lake property. Both the

Midwest and J Zone deposits are located within 20 kilometres of the McClean Lake mill.

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

Environmental Services division and 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