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Cripple Creek & Victor Gold Mining opt <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 /> Lea <br /> Y;�4 <br /> SENT CERTIFED, RETURN RECEIPT REQUESTED <br /> 7003-2260-0004-80 82-5 766 <br /> February 1, 2010 <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 /> Re: Permit No. M-1980-244; Cripple Creek & Victor Gold Mining CoMpany ("CC&V"); <br /> Cresson Project; — 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. <br />