2020-08-03_REVISION - M1980244 ‎(11)‎

• Permit No: M1980244
• IBM Index Class Name: Revision
• Doc Date: 8/3/2020
• Doc Name: Adequacy Review - Preliminary
• From: CC&V
• To: DRMS
• Type & Sequence: AM13
• Email Name: TC1
• Email Name: MAC
• Email Name: ERR
• Email Name: JPL
• Email Name: BFB
• Media Type: D
• Archive: No

ICMC RECERTIFICATION SUMMARY AUDIT REPORT

Standard of Practice 4.5: Implement measures to protect fish and wildlife from direct or indirect
discharges of cyanide process solutions to surface water.
CC&V is:
in full compliance with
Standard of Practice 4.5 in substantial compliance with
not in compliance with
Summarize the basis for this finding:
The operation is in FULL COMPLIANCE with Standard of Practice 4.5; implement a comprehensive water
management program to protect against unintentional releases.
CC&V operates with zero discharge of process solutions and no discharge of cyanide solutions to surface
waters have occurred during the recertification period. Under the Discharge Permit Number CO0043648,
CC&V is authorized to discharge from two outfalls: 1) Outfall 001A: discharge to the Arequa Gulch from the
sedimentation pond (i.e., water from the VLF1 underdrain system), and 2) Outfall 005B: discharge of treated
process water from the ESP to the Arequa Gulch if extraordinary storm events cause the ESP capacity to be
exceeded. The auditors reviewed DMR reports for the certification period to confirm no discharge of cyanide
solutions to surface waters.
CC&V does not have any indirect discharge of cyanide solutions to surface waters. CC&V operates with zero
discharge of process solutions. CC&V monitors for cyanide in compliance points downstream from the
cyanide process facilities at Stations AG 2.0, GV 02, GV 03, T 02, and WCSW 01. Analytical data from 2014
to 2016 from these stations showed that free cyanide concentrations are <0.010 mg/L (i.e., below laboratory
detection limit). Therefore, no impact to beneficial uses has occurred.
Standard of Practice 4.6: Implement measures designed to manage seepage from cyanide
facilities to protect the beneficial uses of groundwater.
CC&V is:
in full compliance with
Standard of Practice 4.6 in substantial compliance with
not in compliance with
Summarize the basis for this finding:
The operation is in FULL COMPLIANCE with Standard of Practice 4.6; implement measures designed to
manage seepage from cyanide facilities to protect the beneficial uses of groundwater.
CC&V has implemented measures to protect groundwater below and downgradient of the operation.
Measures include:
VLF facilities with zero discharge. The ore storage liner system of the VLFs consist of soil liner placed
on a prepared subgrade and overlain by geomembrane, which is then overlain by a pipe drain system
embedded in drainage cover fill material. The liner system within the PSSAs consists of soil liner,
overlain by geomembrane, overlain by solution collection fill material, overlain by geomembrane, which
is then overlain by drainage cover fill material. Additionally, the VLFs are equipped with leak detection
and collection systems.
All cyanide tanks and pipes have been designed with secondary containments such as concrete or
lined containments. In addition, the entire perimeter of the cyanide facilities is lined with a
geomembrane.
CC&V conducts weekly inspections of the leak collection systems and VLF underdrains to ensure that
the facility is functioning as designed and protective of the environment. Additionally, CC&V has
installed several monitoring well immediately downgradient of the cyanide process facilities to monitor
groundwater.
CC&V Mine
Name of Facility __________________________________
Signature of Lead Auditor
July 28, 2017
Date
July 2017
Report No. 1663584-003-R-Rev0 13