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NEWMONT <br />April 10, 2017 <br />TC1 WHE <br />M-198-0244 TR90 <br />Annual Fee/Report: CW <br />J Violations: <br />MV1995007 AS 1024/19% <br />MV1995050 726/1995 AB 82/1995 <br />MV1995070 1023/1995 AB 10/17/1995 <br />MV2015005 5272015 <br />MV2016035 6222016 AB 1/18/2017 <br />SENT CERTIFIED RETURN RECEIPT REQUESTED <br />7015 1660 0000 0779 8638 <br />Mr. Timothy Cazier, P.E. <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 />Newmont Mining Corporation <br />Cripple Creek & Victor Gold Mining Company <br />100 N 3r0 St <br />P.O. Box 191 <br />Victor, CO 80860 <br />www.newmont.com <br />RECEIVED <br />APR 13 2017 <br />INSION OF RECLAMATION <br />wHoGAND SAFETY <br />Re: Cripple Creek & Victor Gold Mining Company ("CC&V"); Cresson Project M-1980-244; — <br />Mercury Retort — TR#90 <br />Dear Mr. Cazier: <br />As per our discussion during the Division of Reclamation, Mining and Safety's (DRMS) March 2017 <br />monthly monitoring inspection, CC&V hereby submits Technical Revision No. 90 (TR -90) to obtain <br />approval for the installation of a 6 cu. ft. mercury retort as an additional control to enhance our existing <br />mercury control systems. The Retort will be located in the Arequa Gulch Absorption, Desorption, and <br />Recovery Facility (AGADR) refinery and will be used to remove mercury from the gold concentrate <br />generated through the electrowinning cells at the Squaw Gulch Absorption, Desorption, and Recovery <br />Facility (SGADR) and the AGADR. Once the gold concentrate has been treated in the retort, the gold <br />concentrate will be placed in the furnace, fired and poured in to dors bars as per existing practices. <br />Background <br />As mining progresses deeper in both the Wild Horse Expansion Pit (WHEX) and the Cresson Pit and to <br />new areas such as North Cresson Mine Area, CC&V is observing an increase invariability in the ore <br />geochemistry. In response to these observations and in alignment with Newmont's regional approach, <br />CC&V is seeking to construct a more efficient and effective control system, with the new unit having a <br />design mercury control efficiency of up to 99%. <br />In addition to DRMS permitting, CC&V has engaged the Colorado Air Pollution Control Division <br />APCD) on the construction of a retort to ensure appropriate permitting through other agencies. As a <br />result of our permitting actions with APCD, APCD will include the retort when it issues a Title V Permit <br />for all mercury control systems.