2015-05-14_REVISION - M1980244 (2)

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k"i 7 May 2015 Cripple Creek & Victor Gold Mining A Joint Venture ANGLOGOLD ASHANTI (COLORADO) CORP., Manager Operations Office P.O. Box 191 100 North 3'd Street Victor, Colorado 80860 (71 9) 689-2977 — Fax (719) 689-3254 SENT CERTIFIED, RETURN RECEIPT REQUESTED 7014-0150-0000-6082-6837 Mr. Timothy Cazier, P.E. Environmental Protection Specialist Colorado Department of Natural Resources Division of Reclamation, Mining and Safety Office of Mined Land Reclamation 1313 Sherman Street, Room 215 Denver, Colorado 80203 MAY 14 2015 4d DIVISION OFRECLAMA" ^N MINNOMD SAFET` // 72 14 Re: Permit No. ✓M-1980-244; Cripple Creek & Victor Gold Mining Company ("CC&V"); Cresson Project; — Request for Technical Revision ("TR -74") Squaw Gulch Valley Leach Facility Toe Berm Underdrain Pump -back (SGVLFU) Dear Mr. Cazier: CC&V proposes Technical Revision No. 74 ("TR -74") to Amendment No. 10 of Permit M- 1980-244 ("AM 10") to install a modified version of the SGVLFU (See attached update C-3 Rev 5 general arrangement). Originally, CC&V proposed to pump from the down gradient of the two cement ponds constructed to collect water from the underdrain line and toe berm cut-off trench. After further engineering review it was concluded that a better approach would be to build a sub- surface enclosure (see attached drawings 30-800-19 and 60-800-20 prepared by AMEC Foster Wheeler) with a well to collect water from the underdrain and cut-off trench that runs along the toe of the berm. Water from the toe berm cut-off trench will be pumped into the sub -surface enclosure and then pumped with the water from the underdrain line up to the SQADR. The existing cement ponds will be lined (see attached letter dated 31 March 2015 and plans for lining the ponds from AMEC Foster Wheeler) and used as emergency overflow for the sub -surface enclosure. A trash pump will be used to feed water from the cement ponds back into the well of the sub -surface enclosure as space becomes available following the event that caused the overflow. CC&V is planning to construct the pump back in the second Quarter of 2015 following approval of this TR by the Colorado Division of Reclamation, Mining and Safety ("DRMS") and appropriate approvals from Teller County. I � �f � �r ,,Aa- /99f. 0%0