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DENISONI)II <br />MINES <br />June 29, 2010 <br />Bob Oswald <br />Division of Reclamation, Mining and Safety <br />691 County Road. 233, Room A-2 <br />Durango, Colorado 81301 <br />Dear Mr. Oswald: <br />C? <br />O,L? Ord <br />o O ice <br />Denison Minas (USA) Corp. <br />105017th Street, Suite 930 <br />Denver, CO 80265 <br />USA <br />Tel : 303 628-7798 <br />Fax : 303 389-4125 <br />www.denisonmints.com <br />wo" <br />JUL 15 2010 <br />Din of RecWTO"n, <br />Wnir,g tnd 58" <br />Re: Response to review comments on West Sunday Mine, Permit No. M-1981-021, Temporary Cessation <br />(Revision TC-2). <br />In your review letter, dated June 1, 2010, you requested that Denison provide information as to structure <br />stabilities of the topsoil stockpile, portal entry, buildings, storage tanks, and electrical supply structures. No Ore <br />or low-grade material exists on the surface as also illustrated in the attached photos. <br />Denison continues to work with the BLM on the Environmental Assessment process for some proposed vent <br />holes and exploration drilling; however environmental characterization activities as a part of this process are not <br />likely to fall under DRMS's definition of mining. Denison will continue to keep DRMS informed of any <br />activities associated with this process. <br />Please feel free to contact me directly if you have additional questions or comments. <br />Yours very truly, <br />DENISON MINES (USA) CORP. <br />Christy Wood;a)id, PE <br />Environmental Coordinator <br />Cc: Denison Mines (USA) Corp., File <br />Terry Wetz, Philip Buck, Denison Mines (USA) Corp. <br />Jamie Sellar-Baker and James Blair, US Bureau of Land Management