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2020-08-07_REVISION - M1980244 (2)
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2020-08-07_REVISION - M1980244 (2)
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Last modified
12/27/2024 11:57:51 PM
Creation date
8/13/2020 7:30:53 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
REVISION
Doc Date
8/7/2020
Doc Name Note
Vol 2 of 2
Doc Name
Adequacy Review Response
From
CC&V
To
DRMS
Type & Sequence
AM13
Email Name
TC1
JPL
ERR
BFB
MAC
Media Type
D
Archive
No
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NEWMONT <br /> GOLDCORA <br /> standard water rinsing cycles and one H2O2 rinsing cycle over an approximate six-year period. <br /> The rinsing procedure will employ a rinse-rest strategy as previously approved. The VLFs will be <br /> rinsed in segments with portions being actively rinsed while other areas are allowed to "rest." <br /> Rinse water and H202 will be circulated using the VLF pumping systems at a pumping rate of <br /> approximately 15,000 gallons per minute. <br /> Rinsing criteria previously approved for the VLFs is an average concentration weak acid <br /> dissociable cyanide (CNwAo) of 0.2 mg/L in the rinse water from meteoric water mobility testing <br /> on representative sampling of the spent ore, or in return flows derived from the neutralized ore, <br /> or both. A four-year monitoring period will follow the rinsing to demonstrate compliance with the <br /> standard. Physical reclamation of the VLFs will be completed in approximately 2-years and will <br /> start concurrent with the monitoring period. <br /> Upon achieving the CNwAo rinsing criteria, the VLF liner systems will be breached in the same <br /> manner as previously approved. The liner will be perforated to prevent excessive accumulation <br /> of stormwater infiltration in the neutralized ore behind the toe berms and to move meteoric drain <br /> down stormwater into the underlying diatreme rock. It is anticipated that a drill rig will be used to <br /> drill from the surface of the ore on the VLFs through the synthetic and clay liners into the closure <br /> drains and underdrains, where appropriate. Holes will be drilled to puncture the liner above these <br /> features installed at several locations beneath the PSSAs. This will allow conveyance of post- <br /> reclamation precipitation through the material on the VLFs and into the underlying diatreme. <br /> Following the achievement of the CNwAo removal criteria for both VLFs and following the <br /> breaching of the liner systems (as discussed above), all down-gradient appurtenances will be <br /> reclaimed as follows. <br /> At both VLFs the pipes, pumps and other structures will be removed from the underdrain collection <br /> systems. The concrete pump-back vault side walls and bottom will be broken up, followed by <br /> burial onsite with surrounding fill material. Ponds will be backfilled with material and re-contoured. <br /> The entire area will then be graded to blend with the surrounding topography, followed by <br /> reclamation of the sites. <br /> The slopes of the VLFs will be re-contoured to an overall slope of approximately 2.5H:1 V. Portions <br /> of the benches created during operations will be retained, as appropriate, for geotechnical and <br /> erosional stability. The topography shown on Drawing F-1 and the financial warranty calculations <br /> presented in Exhibit L have been developed based on an overall 2.5HAV slope criterion. <br /> Cripple Creek&Victor Gold Mining Company Exhibit E <br /> Cresson Project Amendment 13 <br /> 13 <br />
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