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NEW MO N T Newmont Mining Corporation <br /> M-1980-244 — TR99 Gree South Fiddlers Green Circle,Suite 800 <br /> Greenwood Village,CO 80111 <br /> T 719-689-2977 <br /> Complied! F 719-689-3254 <br /> FIVE prior Violations! www newmont.com <br /> tcl, whe <br /> SENT CERTIFIED, RETURN RECEIPT REQUESTED <br /> 7017-2400-000-4077-8555 '?iECEY D <br /> 28 March 2018 <br /> Mr. Timothy Cazier, P.E. APR 05 Z018QNtS10 <br /> Environmental Protection Specialist �t N OFRECLAMATIC <br /> Colorado Department of Natural Resources G,4NOSAFETW <br /> Division of Reclamation, Mining and Safety <br /> Office of Mined Land Reclamation <br /> 1313 Sherman Street, Room 215 <br /> Denver, Colorado 80203 <br /> Re: Permit No. M-1980-244; Cripple Creek & Victor Gold Mining Company ("CC&V"); Cresson <br /> Proiect; —VLF2 Corrective Action Plan TR#99 <br /> Dear Mr. Cazier: <br /> Newmont Cripple Creek and Victor Gold Mine (CC&V) hereby submits the following Technical <br /> Revision (TR) 99 proposing to conduct a liner integrity investigation in the immediate area <br /> impacted by the December 16, 2017 Squaw Gulch Valley Leach Facility (VLF2) slough. The <br /> investigative plan, developed by a third party consultant, is presented in Attachment 1. <br /> Background <br /> On Saturday, December 16, 2017 a small internal portion of the VLF2 ore slope sloughed during <br /> loading. Although this event posed no danger to human health, property or the environment, <br /> and through an abundance of caution, CC&V initiated an investigation to confirm VLF2 liner <br /> integrity. <br /> During the February site-wide inspection, a DRMS representative observed equipment <br /> removing ore from the slope in the area of the slide. CC&V advised DRMS of the slide and the <br /> subsequent liner integrity investigation. On March 15, 2018, DRMS issued CC&V a Reason to <br /> Believe a Violation Exists letter and February inspection report. Within the inspection report, <br /> DRMS requested CC&V submit a Technical Revision on or before March 29, 2018 outlining the <br /> process by which the VLF2 liner would be inspected and recertified. This TR is timely submitted <br /> and satisfies this request by providing the liner inspection and recertification plan described <br /> below. <br /> VLF2 Liner Investigation <br /> CC&V has contracted NewField's, a third-party consulting firm, to develop a non-invasive <br /> approach to determine the integrity of the VLF2 liner (Attachment 1). This plan employs two <br /> sophisticated electrical resistivity analyses which will be used to identify the presence of any <br /> liner perforations. These analyses will utilize the ASTM G57-Standard Test Method for Field <br /> Measurement of Soil Resistivity Using the Wenner Four Electrode Method, and the ASTM <br />