2017-07-31_REVISION - M1980244 - Laserfiche WebLink

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TC1 WHE M-1980-244 TR92 NE W M O N T Annual Fee/Report: CW 7 Violations: MV1995007 AB 10/25/1995 Newmont Mining Corporation MV1995050 7/26/1995 AB 08/02/1995 Cripple Creek&Victor Gold Mining Company MV1995070 10/23/1995 AB 10/17/1995 100 N 3'St MV2015005 5/27/2015 AB 02/08/2017 p 0 Box 191 MV2016035 6/22/2016 RE 01/18/2017 Victor, CO 80860 www newmont corn July 26, 2017 SENT CERTIFIED RETURN RECEIPT REQUESTED RECEIVED70151660000007799482 Mr. Timothy Cazier, P.E. JUL 31 2017 Environmental Protection Specialist RDIVISIONOF ECLAMATION ND Colorado Department of Natural Resources MINING RE SAFES YDivisionofReclamation, Mining and Safety Office of Mined Land Reclamation 1313 Sherman Street, Room 215 Denver, Colorado 80203 Re: DRMS Permit No. M-1980-244; Cresson Project; Cripple Creek& Victor Gold Mining Company("CC&V"); —HGM to SGVLF Solution Line—TR#92 Dear Mr. Cazier: Cripple Creek & Victor Gold Mining Company(CC&V) hereby submits Technical Revision No. 92 (TR- 92)to obtain approval to reroute excess High Grade Mill (HGM) solution from the injection wells located on the Arequa Gulch Valley Leach Facility (AGVLF) to an infiltration gallery or into drip lines located on the Squaw Gulch Valley Leach Facility (SGVLF). As approved in TR-79, CC&V currently pumps the excess HGM solution to a series of injection wells located on AGVLF. Due to the high pumping cost CC&V would like to explore new options to efficiently reuse the excess solution coming from the HGM. CC&V proposes to install a new gravity fed line from the HGM to the SGVLF. The line will drain the excess solution into an infiltration gallery located on the 9,650 bench or into the active drip line system. Background The HGM solution originates from the high pH circuit and is used in the cyanide leach circuit. The chemistry of the solution is essentially the same as the solution circulating within the VLFs; both are the same pH level and cyanide level. This proposal is related to TR-79: High Grade Mill Solution Piping to AGVLF Injection Drains and is intended to replace the injection well system. Since CC&V has commissioned the HGM the solution has been continuously managed and the cost of pumping solution up hill to AGVLF has proven to be cost prohibitive. With the growth of the SGVLF, CC&V now has additional alternatives to manage the solution. Furthermore, the addition of the HGM solution to the SGVLF will better aid in gold recovery and improve operational efficiency for both the HGM and SGVLF. Modifications to the Approved Mine Plan Through TR-92 CC&V proposes the installation of a new four inch HDPE pipeline to deliver the excess HGM solution to SGVLF for use on the leach pad. The line will transfer about 125 to 250 gallons per minute to SGVLF. The pipeline will be approximately 1,950 feet long and will drop approximately 250 1