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2008-03-21_PERMIT FILE - C1980007A (8)
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2008-03-21_PERMIT FILE - C1980007A (8)
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Last modified
8/24/2016 3:25:42 PM
Creation date
6/20/2008 11:15:08 AM
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Template:
DRMS Permit Index
Permit No
C1980007A
IBM Index Class Name
Permit File
Doc Date
3/21/2008
Section_Exhibit Name
Exhibit 60E Subsidence Evaluation for the South of Divide & Dry Fork Mining Areas
Media Type
D
Archive
Yes
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• 1.0 INTRODUCTION <br />This exhibit describes subsidence processes that have been observed from studies above longwall <br />mining panels in Mountain Coal Company's (MCC) West Elk Mine and from other similar operations <br />and studies. The subsidence information obtained-from the current West Elk Mine area is used in <br />this application to project subsidence processes, amounts, and effects to the South of Divide and <br />Dry Fork mining areas. This application document is intended to comply with the Colorado Division <br />of Minerals and Geology (CDMG) Regulations for Coal Mining, revised June 26, 2002, under <br />Section 2.05.6, Mitigation of the Impacts of Mining Operations. <br />This report was updated by Tetra Tech to include the Dry Fork mining area with the South of Divide <br />mining area. Since these areas are being miNed together it is logical consider them together in one <br />report. Most of the report is "as contained" in the Exhibit 60B prepared by C. Richard Dunrud of <br />Wright Waters Engineers, Inc. in March 2006 for the South of Divide mining area. The projected <br />mining into the Dry Fork mining area will occur by increasing the lengths of Panels E2, E3, E4, E5, <br />and E6 by 500 feet (for E2) to 3,000 feet (for E4). A reconnaissance of the Dry Fork mining area <br />was conducted by a Tetra Tech geologist on September 20, 2007. Photographs of site features for <br />the Dry Fork area are included as Appendix A. This will extend the longwall mining under the upper <br />areas of Dry Fork, a tributary to Minnesota Creek, and the upper areas of Deep Creek. Panels E1, <br />E7, E8, and E9 are still totally within the boundaries of the South of Divide mining areas. <br />The geologic and mining conditions in the Dry Fork area is near identical to the South of Divide area <br />(Agapito, 2005). Therefore, the subsidence model prepared by Dunrud (Dunrud, 2006) was not <br />rerun and predictions for the Dry Fork area are considered to be as applicable for the South of <br />Divide area. <br />r? <br />I? <br />E <br />Tetra Tech - 090717/P
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