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Newmont Mining Corporation <br /> Cripple Creek&Victor Gold Mining <br /> R1 07 Company <br /> 100 N 3"'St <br /> P.O.Box 191 <br /> Victor, CO 80860 <br /> www.newmont.com <br /> September 20,2018 RECEIVE® <br /> SENT CERTIFIED RETURN RECEIPT REQUESTED $EP 010 ; ; 9 <br /> ; gym <br /> 7017 2400 0000 4077 9569 F N co <br /> DIVISION OF RmAMATION = :t m <br /> MININGAND SAFETY <br /> Mr. Timothy Cazier,P.E. y <br /> Environmental Protection Specialist <br /> Colorado Department of Natural Resources c <br /> Division of Reclamation,Mining and Safety <br /> Office of Mined Land Reclamation <br /> 1313 Sherman Street,Room 215 N <br /> Denver,Colorado 80203 <br /> Re: Permit No. M-1980-244, Cripple Creek & Victor Gold Mining Company: Cresson Project; I,, <br /> TR 107— Aregua Gulch Phase H Solution Flow Modification 3 <br /> M <br /> CL <br /> 0 <br /> 14 <br /> Dear Mr. Cazier: <br /> Newmont Mining Corporation - Cripple Creek and Victor Gold Mining Company (CC&V) hereby <br /> provides the Division of Reclamation, Mining and Safety (DRMS) Technical Revision (TR) No.107 <br /> requesting three modification options to better manage solution chemistry in order to achieve higher <br /> recovery at the Arequa Gulch(AG)Processing Facilities. <br /> Background: <br /> CC&V is proposing the following modification options in order to prevent and control scaling at the AG <br /> Valley Leach Facility (VLF) and Absorption Desorption Recovery (ADR) and improve gold recovery. <br /> CC&V is requesting DRMS approval of these modifications. Depending on success of any one of these <br /> options,we may not implement all of them. Figure 1 details the current process solution flow. <br /> Modifications to the Approved Mine Plan: <br /> CC&V proposes to implement the following four modifications to the AGVLF, AGADR and Pregnant <br /> Solution Enhancement System (PSES) Facilities. Pending approval, all modifications will be on lined <br /> facilities and all piping additions will be steel or High-Density Polyethylene(HDPE)material. <br /> Modification#1: <br /> Leach solution from Phase II of the VLF will be pumped utilizing the existing pipe to the E-Train in the <br /> ADR Plant. The barren solution from the E-Train will then be pumped to the Stabilization tank at the <br /> PSES where slurried lime will be added via pipe from a tank. Solution will then be pumped from the <br /> 1 <br />