Denison Mines Corp. announces that an updated resource estimate has been prepared in accordance with National Instrument 43-101 (NI 43-101) for its Hairhan deposit held by the Gurvan Saihan Joint Venture (GSJV) in Mongolia. Denison holds a 70% interest in the GSJV with the Mongolian state entity Mon-Atom LLC holding 15% and the Russian concern Geologorazvedka holding the remaining 15%. The GSJV holds six exploration licenses, including Hairhan, totalling 181,574 hectares in the South Gobi region of Mongolia.

The updated NI 43-101 resource incorporates results from drilling from 2007 and 2008 in the central portion of the Hairhan deposit. This drilling comprised 278 holes totalling 46,000 metres concentrated in known mineralized areas in order to close drill spacing and to support detailed resource estimation. As a result of the drill programs, which increased the total drilling at Hairhan to over 118,000 metres, uranium contained in the Indicated Resources increased 151% and in Inferred Resources increased 67% over the resources reported previously in the report titled “Technical Report on the Uranium Exploration Properties in Mongolia” dated February 27, 2007, issued by Scott Wilson Roscoe Postle Associates Inc.