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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
Fields
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 /> GOLDCORP <br /> The East Cresson mine area is expected to be backfilled to promote free drainage of stormwater <br /> to the surrounding natural ground surface as previously approved for MILE - Amendment 9 and <br /> MLE2 - Amendment 10. This backfilling will include the Wildhorse Extension (WHEX) portion of <br /> the East Cresson mine area. Backfilling will be accomplished by end-dumping the material in lifts <br /> that range in height, depending on the logistics of truck hauling, the geographic locations relative <br /> to the mine area and overburden placement scheduling. The maximum lift height for backfilling <br /> the East Cresson WHEX will be 300 feet. It is anticipated that this area will be backfilled to an <br /> elevation and shape that will promote free drainage of stormwater to the surrounding surface and <br /> graded to blend with the surrounding topography including the reclaimed topography of the <br /> ECOSA. <br /> As approved in TR-96 the stormwater drainage flow-line in the WHEX backfill will be graded at <br /> 1.5% away from the grassy valley. Stormwater will be directed west, through the constructed <br /> backfill, back into the remaining portion of the mine pit. <br /> The final reclaimed surface of the East Cresson Mine area will be graded to conform to the <br /> stormwater runoff patterns discussed previously approved. A discussion of diversion/conveyance <br /> channels and detention basins for the final backfilled East Cresson Mine area configuration also <br /> is provided in Section 1.5.7. <br /> Cresson Underground Mining <br /> The surface disturbance associated with future underground operations per TR-116 will be <br /> reclaimed in accordance with similar reclamation practices described above. Portal access will be <br /> secured, surface features will be dismantled, and the disturbed area will be revegetated according <br /> to the practices described in Section 1.3.2 above. Disturbances associated with exploration <br /> underground activities will be reclaimed as described in (TR-116). <br /> 1.5.3 VLF1 &VLF2 <br /> Reclamation procedures of both the VLF1 and the VLF2 will occur as previously approved under <br /> Amendment 9 for VLF1 and Amendment 10 for VLF2. The VLFs will be rinsed, slopes will be <br /> regraded, soil will be placed, and revegetation performed. Each of these steps is discussed below. <br /> Active leaching for gold recovery is expected to be completed for the VLF1 in approximately 2028, <br /> and for the VLF2 in approximately 2038. After completion of active leaching, the VLFs will be <br /> rinsed in the same manner as previously approved. Two rinsing cycles, using recirculated solution <br /> and fresh water, will require about 30 months to complete. It is proposed this will be followed by <br /> a hydrogen peroxide (H2O2) assisted rinsing cycle, to complete removal of cyanide (the need for <br /> this H2O2 rinse will be evaluated during VLF rinsing). The financial warranty is based on two <br /> Cripple Creek&Victor Gold Mining Company Exhibit E <br /> Cresson Project Amendment 13 <br /> 12 <br />
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