2017-03-10_REVISION - M1980244 - Laserfiche WebLink

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TR89 f\ NEWMONT 1 ' Newmont Mining Corporation Cripple Creek&Victor Gold Mining Company 100 N 3rtl St `\\ � lampt18C1, P.O.Box 191 ✓4 Violations:MV- Victor, Co 80860 1995-007 www.newmont.com 1995-050 2015-005 March 9, 2017 2016-035 1995-050 SENT CERTIFIED RETURN RECEIPT REQUESTED 7015 1660 0000 0779 8614 Mr. Timothy Cazier, P.E. RECEIVED Environmental Protection Specialist Colorado Department of Natural Resources MAR 10 Z 0 1 7 Division of Reclamation,Mining and Safety Office of Mined Land Reclamation DIVISION OF KO AMATION 1313 Sherman Street,Room 215 MINING&SAFETY Denver, Colorado 80203 Re: Permit No.M-1980-244; Cripple Creek& Victor Gold Mining Company("CC&V"); Cresson Proiect;—Concentrate Shipping—TR#89 Dear Mr. Cazier: Per our discussion during the Division of Reclamation, Mining and Safety's(DRMS)monthly monitoring inspection on January 19, 2017, Cripple Creek& Victor Gold Mining Company (CC&V) hereby submits the following Technical Revision No. 89 (TR-89). Through TR-89 CC&V proposes the implementation of a process to remove High Grade Mill(HGM) flotation concentrate from the circuit for transportation to Newmont's Nevada operations for further refining. Removing concentrates from the HGM and processing the concentrate at Newmont's facilities in Nevada enhances concentrate gold recovery whilst providing geochemical benefits to Newmont's Nevada operations. This process is initially being commissioned as a field scale trial to demonstrate proof of concept, which if successful would result in a permanent increase of between 5 — 25 truck movements beyond current levels. Background In the current configuration, the HGM processes approximately 5,000 tons per day of high grade ore. The facility concentrates the high grade sulfides using flotation techniques and regrinds to a fine,p80= 18 µm, particle size in preparation for 72-hour leaching. The leached slurry is sent through a Carbon in Pulp (CIP) circuit where the leached gold is adsorbed onto carbon which is later collected and trucked to the Absorption, Desorption, and Reduction (ARD) facility where the gold is removed from the carbon, the carbon is regenerated and brought back to the CIP circuit. At the HGM, tails from the CIP circuit are thickened, filtered and hauled with lower grade ore to the heap leaching facility where further leaching and eventual disposal can take place. The flotation tailings are thickened, filtered and conveyed with the CIP tailings to be stacked on the heap leach facility.