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ICMC RECERTIFICATION SUMMARY AUDIT REPORT <br /> <br />PRINCIPLE 4 – OPERATIONS <br />Manage Cyanide Process Solutions and Waste Streams to Protect <br />Human Health and the Environment <br />Standard of Practice 4.1: Implement management and operating systems designed to protect <br />human health and the environment including contingency planning <br />and inspection and preventative maintenance procedures. <br />CC&V is: <br /> in full compliance with <br />Standard of Practice 4.1 in substantial compliance with <br /> not in compliance with <br />Summarize the basis for this finding: <br />The operation is in FULL COMPLIANCE with Standard of Practice 4.1; implement management and <br />operating systems designed to protect human health and the environment including contingency planning <br />and inspection and preventative maintenance procedures. <br />The CC&V operations are currently composed of the HGM, ADR1, VLF1, ADR2, VLF2, the PSES Plant, the <br />External Storage Pond (ESP) and associated concrete and lined secondary containment structures, process <br />solution transfer pipes, valves, and pumps. CC&V has developed and implemented written operating <br />procedures describing the standard of practice necessary for the safe and environmentally sound operation <br />of these cyanide facilities, including the specific measures needed for compliance with the Code and <br />regulatory requirements. <br />The new cyanide facilities constructed since the 2014 recertification audit report include: 1) the HGM that <br />consists of grinding, flotation CIP circuits with final gold recovery to improve gold recovery from some of the <br />site’s higher grade ore deposits; 2) ADR2 that consists of reagent grade cyanide mixing and storage <br />facilities, four carbon trains, an acid wash circuit, a carbon strip and regeneration circuit, and an <br />electrowinning circuit and refinery. Barren solution is conveyed to VLF2, 3) VLF2 (Phase 1) that added <br />approximately 63 acres of heap leach facilities to the CC&V operations, and 4) the PSES Plant, designed <br />and constructed to improve gold recovery by removing metal precipitate solids in the VLF process solution <br />and allowing a more sustainable and even distribution of barren solution onto the VLF. <br />The procedures include process descriptions, operating tasks, inspections, maintenance and shut down <br />procedures. The procedures have been updated, as needed, to reflect changes in procedures and new <br />cyanide facilities/process during the recertification period. Verification of the written procedures included <br />review of the procedures and plans, as well as interviews. <br />CC&V has various procedures, permit documents, and plans that identify the assumptions on the facility <br />design and also include contingency actions for various scenarios related to cyanide. For example, the <br />Procedure 25 for Water Balance Management describes the parameters required for safe operation of the <br />Process Solution Storage Areas (PSSAs) including their maximum operating levels, action levels, reporting <br />levels and total volume levels. The Permit M 1980 244 for Mine Life Extension 2 includes the design storm <br />events and geotechnical considerations taken into account for the design of the VLF areas and for the water <br />balance. In addition, the Permit M-1980-244 for Mine Life Extension 2 (under Section 14.6) includes <br />procedures for cyanide management in the event of temporary cessation of the mine. These procedures <br />consider circulation of solutions, and monitoring and maintenance of the water balances associated with the <br />VLFs. The Discharge Permit Number CO0043648 authorizes discharges from Outfall 005B (from the ESP to <br />Arequa Gulch) to prevent an overflow od the VLF facilities in case of upset conditions only, prior treatment of <br />the WAD cyanide in the ESP. The Discharge Permit provides discharge limitations, including daily maximum <br />and minimum numerical values for WAD cyanide, and monitoring requirements. The operating procedures <br />for the process areas cover the operational requirements for all tanks, valves, pipes, and other equipment <br />with regard to elements such as tonnages, densities, pH, and cyanide concentrations. <br />CC&V Mine <br />Name of Facility __________________________________ <br />Signature of Lead Auditor <br />July 28, 2017 <br />Date <br />July 2017 <br />Report No. 1663584-003-R-Rev0 9