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2008-09-17_REVISION - M1980244 (28)
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2008-09-17_REVISION - M1980244 (28)
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Last modified
6/15/2021 5:52:18 PM
Creation date
9/19/2008 7:43:12 AM
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Template:
DRMS Permit Index
Permit No
M1980244
IBM Index Class Name
REVISION
Doc Date
9/17/2008
Doc Name
Response to Adequacy Review
From
CC&V
To
DRMS
Type & Sequence
AM9
Media Type
D
Archive
No
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• <br />• <br />• <br />VI) <br />areas by wildlife for migrating. Experience at the Cresson Project suggests that tree <br />transplanting or tree seedling planting is successful without fencing. <br />K. As stated under the mining plan, DRMS recommends CC&V completely backfill the North <br />Cresson area to original contour, in part to limit infiltration of surface water expressing as <br />shallow ground water through the exposed high wall fractures and fissures which could <br />adversely impact the long term hydrologic balance. <br />Response: <br />CC&V respectfully disagrees with the stated basis for completely backfilling the North <br />Cresson area to original contour. As presented in the response to IV (B) above, all water <br />falling into the Globe Hill Mine that does not evaporate will infiltrate to the diatreme, and <br />eventually migrate to the regional ground water table that is intersected by the Carlton <br />Tunnel. There will be no resulting impact to the hydrologic balance (or to the quality). There <br />will be no shallow ground water flow through the exposed highwall of the Schist Island mine. <br />Even if there were, the water would infiltrate into the Schist Island mine backfill, and <br />eventually migrate to the regional ground water table that is intersected by the Carlton <br />Tunnel. This would be beneficial: in the event that the water had any potential metal or acidic <br />constituents, the passage through the diatremal materials to regional ground water table <br />would remediate that condition, and render the water, if it flowed out of the Carlton Tunnel, <br />of the same quality as the water currently observed in the Carlton Tunnel. <br />Notwithstanding the above, CC&V voluntarily agreed to regrade and reclaim the North <br />Cresson area mine highwall view shed area as a condition of approval of the Teller County <br />Mine Development Plan. A technical revision to DRMS will be submitted to adjust the post- <br />mining topography, the sequence maps, and the financial warranty for the updated <br />reclamation. This revision will be submitted following approval of the MLE Project <br />Application. <br />Exhibit G- Water Information-Rule 6.4.7 <br />A. The Division recommends calculating net-acid generation potential for the waste-rock <br />through time, so that not only spatial but temporal variations in the geochemical makeup of <br />the rock and the potential leachate can be predicted and understood through the life of the <br />overburden storage areas. This will also help in determining the appropriate lime <br />amendment as discussed under item "H" above. <br />Response. <br />CC&V respectfully represents that the specific prediction for the timing of the release, if any, <br />of the potential leachate could be misleading and is unnecessary. CC&V has presented <br />information (MLE Project Application, Volume II, Appendix 1, Section 3) that shows that all <br />leachate that may be released from mined and placed overburden would be directed through <br />the diatreme and the neutralizing potential that exist there, and would eventually migrate to <br />the regional ground water table that is intersected by the Carlton Tunnel. This process has <br />been shown to produce water that has the same composition as the water that was emerging <br />from the Carlton Tunnel prior to the inception of the CC&V surface mining, and would <br />21
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