Denison Mines Corp. Provides Date for Second Quarter 2012 Results and Conference Call

TORONTO, ONTARIO -- (Marketwire) -- 07/31/12 -- Denison Mines Corp. (TSX: DML)(NYSE MKT: DNN)(NYSE Amex: DNN) ("Denison" or the "Company") announces that the Company will issue its second quarter 2012 results in the evening on Thursday, August 9, 2012. Denison will hold a telephone conference with a webcast presentation at 9:00 am ET on Friday, August 10, 2012 to discuss financial results for the second quarter ending June 30, 2012.

Please call in 5-10 minutes before the conference starts and stay on the line (an operator will be available to assist you). The call-in number is (416) 340-2217.

To view the live presentation, please log on at www.denisonmines.com 10 minutes prior to the call.

Approximately two hours after the call:

--  a replay of the telephone conference will be available at 905-694-9451
    and the passcode is 6011854; and
--  the presentation will be available at www.denisonmines.com.

About Denison

Denison Mines Corp. is a uranium exploration and development company with interests in exploration and development projects in Saskatchewan, Zambia and Mongolia. As well, Denison has a 22.5% ownership interest in the McClean Lake uranium mill, located in northern Saskatchewan, which is one of the world's largest uranium processing facilities. Denison's exploration project portfolio includes the world-class Phoenix deposit located on its 60% owned Wheeler River project also in the Athabasca Basin region of Saskatchewan.

Denison is engaged in mine decommissioning and environmental services through its Denison Environmental Services (DES) division. Denison is also the manager of Uranium Participation Corporation (TSX: U), a publicly traded company which invests in uranium oxide in concentrates and uranium hexafluoride.

Contacts:

Denison Mines Corp.

Ron Hochstein

President and Chief Executive Officer

(416) 979-1991 ext. 232


Denison Mines Corp.

James Anderson

Executive Vice President & Chief Financial Officer

(416) 979-1991 ext. 372
www.denisonmines.com