2020-08-07_REVISION - M1980244 (11)

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ICMC RECERTIFICATION SUMMARY AUDIT REPORT The regulatory numerical standard for cyanide in groundwater, applicable to CC&V, is 0.20 mg/L WAD cyanide based on five quarters of baseline data. CC&V currently monitors groundwater quality at 18 compliance wells surrounding the operation on a quarterly basis. Five groundwater compliance points were added to the monitoring network with the addition of the HGM,ADR2, and VLF2 to the CC&V operations. The auditor reviewed quarterly groundwater monitoring data from 2014 to 2016. Over this period,WAD cyanide concentrations at all 18 compliance wells were less than the detection limit(<0.01 mg/L). Standard of Practice 4.7: Provide spill prevention or containment measures for process tanks and pipelines. ® in full compliance with CC&V is: ❑ in substantial compliance with Standard of Practice 4.7 ❑ not in compliance with Summarize the basis for this finding: The operation is in FULL COMPLIANCE with Standard of Practice 4.7; provide spill prevention or containment measures for process tanks and pipelines. CC&V has spill containment measures for all of the cyanide related storage and process tanks. No changes or modifications have been made to the secondary containments of ADR1 for cyanide storage tanks, process tanks, and process columns since the 2014 recertification audit.The 2014 recertification audit indicate that all cyanide storage and process tanks at ADR1 are provided with concrete and/or lined secondary containment.A geomembrane liner, keyed to the VLF1 liner system, underlies the entire ADR1, including the Cyanide Offload/Storage Facility.The liner serves as tertiary containment for the concrete secondary containment facilities.The auditors observed that these containments were still in good condition and suitable for use. Regarding the new cyanide facilities,the secondary containments of the HGM,ADR2, and PSES area for cyanide storage tanks, process tanks, and/or process columns have also been all designed and constructed with secondary containment measures.At the HGM, all cyanide tanks and process solution tanks have reinforced concrete secondary containment.The HGM building is also lined with a LLDPE geomembrane that serves as tertiary containment.At ADR2, all cyanide tanks and process solution tanks have reinforced concrete secondary containment.The barren solution tank is located outside the ADR2 building within the LLDPE geomembrane lined area. The liner serves as tertiary containment for the concrete secondary containment.At the PSES Plant, all process solution tanks have reinforced concrete secondary containment and/or lined containments.The tanks located outside the PSES building such as the clarifier,thickener and stabilization tanks are within the LLDPE geomembrane lined area.The liner serves as tertiary containment for the concrete secondary containment inside the building. CC&V has adequately sized spill containment measures for all new cyanide and process solution tanks at HGM,ADR2, and PSES Plant.The auditors reviewed volume calculations to verify compliance. CC&V has adequately sized spill containment measures for all cyanide and process solution tanks at ADR1, as accepted in the 2014 recertification audit and previous audits. No changes to the ADR2 secondary containments have occurred since the 2014 rectification audit. CC&V has implemented procedures to prevent discharge to the environment of any cyanide solution or cyanide contaminated water that is collected in the secondary containment area. Measures include concrete floor sumps with dedicated pumps to return any cyanide solution to the process circuits. In the case of outside tanks with lined secondary containment area,any cyanide solution spilled from these tanks will be collected in the lined secondary containment area, sloped to drain to the VLF liner systems for solution recovery. CC&V has constructed all cyanide and process solution pipelines at within concrete or geomembrane lined secondary containment.As described in the 2014 recertification audit report,the nearest perennial stream is Cripple Creek, located approximately two miles south of the operation and therefore, no areas exist where cyanide pipelines present a risk to surface water. i CC&V Mine July 28.2017 Name of Faalrfy Signature of Lead Auditor Date July 2017 Golder Report No.1663584-003-R-RevO 14 ASSOC1 s