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Cripple Creek &Victor Gold Mining <br />A Joint Venture • ANGLOGOLD ASHANTI (COLORADO) CORP., Manager <br />Operations Office <br />P.O. Box 191 • 100 North 3`° Street <br />Victor, Colorado 80860 <br />(719) 689-2977 - Fax (719) 689-3254 <br />February 1, 2010 <br />SENT CERTIFED, RETURN RECEIPT REQUESTED <br />7003-2260-0004-8082-5766 <br />Mr. Berhan Keffelew <br />Environmental Protection Specialist <br />Colorado Department of Natural Resources <br />Division of Reclamation, Mining and Safety <br />Office of Mined Land Reclamation <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br /> <br />"F' EB 0 2 2010 <br />DivWion of Reclamation, <br />712 !fining and Safety <br />Re: Permit No M-1980-244• Cripple Creek & Victor Gold Mining Company ("CC&V"); <br />Cresson Proiect• - Request for Technical Revision ("TR-57") Process Fluid Injection Program <br />on the Valley Leach Facility ("VLF") <br />Dear Mr. Keffelew: <br />CC&V proposes the following minor changes as part of this request for Technical Revision (TR- <br />57) to the Amendment No. 9 to Permit M-1980-244: Process Fluid Injection Program of the VLF <br />(please refer to attached AMEC Earth and Environmental (AMEC) analysis dated December 17, <br />2009). <br />In addition to the drilling, construction and operating conditions outlined in the aforementioned <br />AMEC letter, CC&V is committed to monitoring the initial three (3) injection (or stimulation) <br />events utilizing the services of an experienced, electro-hydrodynamic (EHD) monitoring <br />consultant. The EHD method includes a network of surface and subsurface sensors that will <br />provide real-time monitoring of indicated solution flow profiles. This effort will provide an <br />avenue to reconcile physical operations with analytical relationships and establish a robust <br />baseline to ensure complete process control during stimulation. <br />CC&V has reviewed these minor changes for impacts to the financial warranty calculations. The <br />financial warranty as approved for Amendment No. 9 does not need to be modified.