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dENISONI)II <br />MINES <br />June 30, 2010 <br />Bob Oswald <br />Division of Reclamation, Mining and Safety <br />691 County Road 233, Room A-2 <br />F? <br />11 <br />e <br />01 <br />?qo Durango, Colorado 81301 <br />Denison Mmes (USA) Corp. <br />105017th Street, Quite 950 <br />Denver, CO 80365 <br />USA <br />Tel : 303 688-7798 <br />Fax : 303 3894125 <br />www.deniammines.com <br /> <br />JUL 15 2010 <br />Di Anion of Raciamadon, <br />WnbV end Safety <br />Dear Mr. Oswald: /1. <br />Re: Resp? de" to review comments on Sunday Mine, Permit No. M-1971-285, Temporary Cessation (Revision <br />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. A <br />small pile of low grade ore exists at the Sunday which is being removed within the next 60 days. In addition, <br />equipment and scrap metal that was previously stored at the site is currently being removed. Based on this <br />remaining work that is being completed, Denison would like to request a 60 day extension to respond to your <br />letter. <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 Woo ward, 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