Denison Announces Filing of Annual Report ON Form 40-F

Denison Mines Corp.

1100 – 40 University Ave

Toronto, ON M5J 1T1

www.denisonmines.com

@DenisonMinesCo

PRESS RELEASE

DENISON ANNOUNCES FILING OF ANNUAL REPORT ON FORM 40-F

Toronto, ON – March 30, 2017 Denison Mines Corp. (“Denison” or the “Company”) (DML: TSX, DNN:

NYSE MKT) is pleased to announce that it has filed its 2016 annual report on Form 40-F with the U.S.

Securities and Exchange Commission ("SEC"). Denison's Form 40-F, which includes its management

discussion and analysis and audited financial statements for the year ended December 31, 2016, is

available on Denison's website at www.denisonmines.com, and on the SEC's website at

www.sec.gov/edgar.shtml.

In addition, Denison has filed its Annual Information Form with Canadian regulatory authorities, which is

also available on Denison's website at www.denisonmines.com and under the Company's profile on

SEDAR at www.sedar.com.

Holders of Denison's securities may receive a free printed copy of the Company's most recent Form 40-F

and Annual Report, including the audited financial statements, by sending an email request to

[email protected], by submitting a request online at www.denisonmines.com, or by writing to

Denison Mines Corp., 1100 - 40 University Avenue, Toronto, Ontario, Canada M5J 1T1.

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 350,000 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