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2012-02-28_REVISION - M1980244 (85)
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2012-02-28_REVISION - M1980244 (85)
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Last modified
8/24/2016 4:49:13 PM
Creation date
3/15/2012 3:34:12 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
REVISION
Doc Date
2/28/2012
Doc Name
VOL 7, Part 4: Cyanide Mgmt Code Recertification Audit
From
CC&V
To
DRMS
Type & Sequence
AM10
Email Name
TC1
Media Type
D
Archive
No
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Cresson Project <br />Name of Mine <br />4.4 Implement measures to protect birds, other wildlife and livestock from <br />adverse effects of cyanide process solutions. <br />The operation is: <br />• in full compliance <br />❑ in substantial compliance <br />❑ not in compliance...with Standard of Practice 4.4. <br />Discuss the basis for the Finding/Deficiencies Identified: <br />Phase III pregnant solution flows through a small external solution equalization pond <br />(a.k.a. "Bird Ball Pond ") located on the south side of the VLF prior to reporting to the <br />Phase I PSSA. This small pond, which is fenced and covered by high density <br />polyethylene (HDPE) bird balls, is the only facility in which open cyanide- bearing <br />solutions could occur. Data reviewed during this onsite recertification audit demonstrate <br />that WAD cyanide concentrations in the Phase III pregnant solution are maintained below <br />50 mg/1 (typically below 10 mg /1). <br />The 22- million gallon External Storage Pond currently serves as an emergency storage <br />pond and does not continually or routinely store process solution, although, <br />freshwater /precipitation is maintained in the pond at an approximate depth of six feet. <br />CC &V samples this water for cyanide if process solution is introduced, which has not <br />occurred over the past three years. This pond is fenced and equipped with an audible <br />hazing system. <br />In accordance with the Wildlife Protection Plan, CC &V personnel are instructed to <br />contact the Environmental Department when wildlife mortalities are discovered and to <br />document the details of the incident. According to CC &V Environmental personnel <br />interviewed during this onsite recertification audit, no cyanide - related wildlife mortalities <br />have occurred since the June 2007 certification audit. CC &V provided evidence of <br />documentation completed for wildlife incidents that had occurred prior to the June 2007 <br />certification audit. <br />CC &V uses buried drip emitters to apply leach solution to the tops of the heaps in order <br />to minimize freezing and ponding. Drip lines on the sides of heaps remain on the slope <br />surface, where the potential for ponding is low due to the steep slopes, although CC &V is <br />exploring a method to bury the drip lines on the side slopes so that the wind does not <br />displace them. Overspray is effectively eliminated with the drip emitters. CC &V has <br />implemented procedures for rectifying ponding of process solutions containing cyanide <br />concentrations greater than 20 mg/1, which include measures to deter wildlife from <br />standing process solution in active areas of the leaching and process facilities, correcting <br />any area of standing process solution which has surface dimensions larger than 3 -ft by 3- <br />ft, and employing fencing, bird balls, and /or netting where standing process solution <br />cannot be avoided. <br />September 22, 2010 <br />Signature of Lead Auditor Date <br />Page 14 of 36 <br />
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