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2009-09-03_REVISION - C1980007 (3)
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2009-09-03_REVISION - C1980007 (3)
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Last modified
8/24/2016 3:55:15 PM
Creation date
9/4/2009 10:59:17 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
REVISION
Doc Date
9/3/2009
Doc Name
Preliminary Adequacy Review
From
DRMS
To
Mountain Coal Company
Type & Sequence
TR118
Email Name
TAK
Media Type
D
Archive
No
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West Elk Mine <br />Access to the West Elk Mine is controlled with electronic security gates at the lab entrance (to the <br />silo pad and pond MB-2R) and the main mine site entrance off State Highway 133. To enter into <br />the mine site, the gates will be controlled by an electronic card reader. To exit the mine site, an <br />electronic "exit loop" will activate the gates. A phone will be installed at the main mine site gate <br />for visitors. Locked manual gates control other entrances to the disturbed area (i.e. Lone Pine <br />Gulch, the North Soil Storage Area, and the Refuse Pile Expansion). Security monitoring of the <br />mine area occurs as necessary. <br />In addition to fences and security monitoring, signs are used to control access to the permit area <br />and facilities within the area. Signs identifying the mine area are displayed at all points of access <br />from public roads and highways. These signs show the name, business address, and telephone <br />number of the Permittee and identification numbers of current mining and reclamation permits or <br />o*?her authorizations to operate. Permit boundary signs are also present along the entire perianeter <br />of the disturbed mine site. Topsoil stockpiles, subsoil stockpiles, and the refuse area are clearly <br />marked with material identification signs. <br />Soil Stockpiles <br />As West Elk Mine is an underground mine and most of the reclamation will not begin until the <br />end of the life of the mine, it is necessary to have subsoil and topsoil stockpiles. The main <br />topsoil pile is located to the south of the run-of-mine coal stack-pad and will be used for <br />reclamation of the main mine facilities area. Some subsoil from the subsoil pile in Sylvester <br />j Gulch, (Live Subsoil Pile #1) as well as the topsoil from the stockpile at the North Soil <br />Storage Area (NSSA), will be used for reclamation of the Lower Refuse Pile. MCC has also <br />stockpiled topsoil from the Refuse Pile Expansion (RPE) area and the widening of the mine <br />entrance at the NSSA on the north side of Highway 133. <br />Landslide Corrective Measures <br />In 1997 and 1998, MCC employed several corrective measures to stabilize the landslide at the <br />main mine facilities area, as surges of movement had been experienced in 1996 and 1997. The <br />corrective measures included the installation of rock buttresses, stone columns, horizontal drains, <br />pins (micro-piles), and the expansion of the roller compacted (RCC) buttress. These structures <br />are described in detail, and their effectiveness in improving the stability of the facilities area is <br />discussed in Exhibit 14C, 1998 Landslide Corrective Measures Report by Barr <br />Engineering/Harding Lawson Associates. The purpose of the corrective measures was to prevent <br />catastrophic failure, which MCC was successful in doing. MCC will continue to evaluate the <br />effectiveness of the corrective measures over time to evaluate their effectiveness for the long <br />term (i.e. post-reclamation). MCC is collecting water level data and movement data from <br />various piezometers, inclinometers, and survey mirrors around the mine site on a scheduled <br />interval. Based on the data collected, MCC will reevaluate the slope stability analyses after <br />spring runoff each year and where appropriate, update Exhibit 14C. The update will include an <br />evaluation of the relative change in the factor of safety during the previous year and since the <br />installation of the corrective measures in 1998. A revision including the updated information <br />will be provided to the CDMG by July 30th of each year. <br />2.05-28 Revised June 2005 PRIO; Rev. January 2006; Rev. March 2006; Rev. April 2006 PRIO, May 2006 PRIG; Rev. January 2009 MR-350
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