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dEN150NI) <br />MINES <br />VIA Email AND US MAIL <br />July 31, 2010 <br />r <br />fez I ©51p10 <br />?.,4Cf141? <br />Mr. Bob Oswald <br />Environmental Protection Specialist <br />State of Colorado <br />`TO Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Dear Mr. Oswald: <br />Denison Mines (USA) Corp. <br />1050 17th Street, Suite 950 <br />Denver, CO 80265 <br />USA <br />Tel : 303 628.7798 <br />Fax : 303 389-4125 <br />www.denisonmines.com <br />ZS /6 PO 2®?® <br />4f,6.t7 Of /e/0 19 a e( aam ffI6e <br />Safe y of <br />Re: Operator Aceeptance_of Amendment Requirements Van 4 Mine -Permit M-1997-032, <br />Amendment AM-1. <br />Denison Mines (USA) Corp. ("Denison") received your letter regarding the; "Environmental Protection Plan for <br />DMO Amendment Materials, Permit Number M-1997-032, Van 4 Mine Amendment AM-; Request for <br />Operator's Acceptance of Amendment Requirements, for Adequacy of Amendment" dated June 30, 2010. Per <br />your letter, Denison accepts the following amendment requirements as outlined in your letter: <br />• Denison will provide copies of the ore pad liner manufacturer's tests for the liner. <br />• Denison will provide follow-up certification reports including all aspects of the installation, for <br />each liner installed. <br />• Denison will have a Colorado registered Professional Engineer oversee the preparation and <br />installation of the liner in accordance with the approved plan. Documentation from this qualified <br />individual regarding installation under proper conditions and performance will be provided to the <br />Division upon completion of liner installation. <br />• Denison will follow and adhere to those aspects of the Environmental Protection Plan (EPP), in <br />form and content of the final iteration. <br />Please consider this letter written acceptance of the requirements and conditions as outlined in your letter (and <br />summarized above), and all aspects of the final iteration of the EPP.