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2019-12-13_REVISION - M1980244 (55)
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2019-12-13_REVISION - M1980244 (55)
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Entry Properties
Last modified
1/7/2025 2:02:33 AM
Creation date
12/16/2019 2:38:11 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
Revision
Doc Date
12/13/2019
Doc Name Note
Appendix 3
Doc Name
Request For Amendment To Permit
From
CC&V
To
DRMS
Type & Sequence
AM13
Email Name
TC1
MAC
BFB
ERR
JPL
Media Type
D
Archive
No
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STORMWATER MANAGEMENT PLAN <br /> CRIPPLE CREEK AND VICTOR GOLD MINING COMPANY <br /> Clearing and grubbing existing vegetation is the first step in mining undisturbed land. Trees and shrubs are <br /> removed mechanically; removed trees are made available for employee and community domestic use. <br /> Remaining vegetative slash is used to construct wildlife habitat features or sediment traps at the down- <br /> gradient edges of disturbed areas, or as mulch for revegetation. Soils and other growth media are stripped <br /> after vegetation has been cleared. Soils are stockpiled, or directly used to prepare reclaimed slopes for <br /> revegetation during reclamation (described below). <br /> Overburden is mined rock that contains less than the economic gold grade cut-off Overburden is removed <br /> by blasting and conventional open-pit mining methods. Overburden is loaded into haul trucks using front- <br /> end loaders or hydraulic shovels and is hauled for placement as backfill in pits or in engineered overburden <br /> storage areas (OSAs). <br /> Ore is rock containing the minimum economic cut-off gold grade Ore is mined and hauled in a similar <br /> manner as overburden: rock is drilled and blasted, after which it is loaded into haul trucks and transported <br /> for further processing <br /> Ore is processed at the Site in two different ways, depending on the grade. Low-grade ore is crushed, <br /> mixed with lime, and heap leached on a synthetically-lined/compacted clay liner combination valley leach <br /> facility (VLF). The gold-containing leach solution (pregnant solution) is then processed at the enclosed <br /> Adsorption, Desorption, and Recovery Facility (ADR) where gold is recovered from the pregnant solution <br /> by adsorption onto activated carbon, followed by desorption, electrowinning and refining processes A <br /> double composite-lined external storage pond may also be used during periods of wet weather to store <br /> additional process solution after CN destruction has been applied. During periods when the external storage <br /> pond is not needed for contingency solution storage, the external storage pond may be used for fresh water <br /> or stormwater storage. Any water or solutions that accumulate in the external storage pond are classified <br /> as process water and circulated back to the process circuit. The entire leach process circuit, including VLF, <br /> ADR, and associated facilities, are double composite-lined and designed as zero-discharge facilities. <br /> High-grade ore is milled and processed in the High-Grade Mill (HGM) facilities. The HGM facilities are <br /> constructed within a double composite-lined area of the Squaw Gulch OSA that is tied to the Squaw Gulch <br /> and Arequa Gulch VLF liner system, creating a zero-discharge facility. Containment associated with the <br /> concrete foundation and curbing within the mill building provides additional protection from potential leaks <br /> and spills within the mill building. <br /> Three different qualities of higher grade ore type are stockpiled near the HGM facilities in three stockpiles <br /> capable of holding up to 110,000 tons(-70,000 yd3). A reclaim stockpile is created by blending the differing <br />
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