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GENERAL30918
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Last modified
8/24/2016 7:48:20 PM
Creation date
11/23/2007 6:49:57 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981033
IBM Index Class Name
General Documents
Doc Date
11/14/2003
Doc Name
Proposed Decision & Findings of Compliance For RN4
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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Little or no coal processing waste was generated at the Bear No. 3 Mine. Any coal mine <br />waste was disposed at approved coal mine waste storage piles at regional mines. Coal from <br />the mine was trucked off site without any chemical or physical treatment. <br />Non-coal wastes generated at the Bear No. 3 Mine were stored on site, and periodically <br />transported to the Delta County landfill for proper disposal. Non-coal waste was contained <br />in the non-coal waste storage area prior to removal to the landfill. No liquid wastes were <br />placed in the storage area and material in the area is stored in a manner which will prevent <br />scattering of airborne debris. <br />X. Backfilling and Grading <br />Backfilling and grading information for the Bear No. 3 Mine is located in Sections 2.05.3, <br />2.05.4 and 4.14, Map 12 and Map 13, of the Bear No. 3 permit application. Rocky <br />Mountain Geotechnical Company completed several stability analyses for Bear Coal <br />Company. <br />On November 9, 1996, mining operations ceased at the Bear No. 3 Mine. The Bear No. 3 <br />Mine portals were sealed on January 9, 1997. Discharge pipes were installed in each of the <br />three portal seals to allow for mine drainage, if it should occur. The backfilling and grading <br />of the portals and the access road also occurred in 1997. <br />Beaz Coal Company modified the existing unreclaimed Edwards mine portals and added <br />additional portals to access the Bear No. 3 Mine. Bear Coal Company submitted a <br />geotechnica] investigation and stability analysis of the portal access road and portal <br />facilities, prepazed by Rocky Mountain Geotechnical, Inc. This report analyzed the stability <br />of the existing slope, several proposed alternative portal construction plans, and several <br />reclamation configurations for this azea. <br />The geotechnical investigation and stability analysis determined that the affected bedrock <br />slope stability above the mine portals could be improved by the excavation of a thin surficial <br />deposit of colluvial debris. The resulting surface would be in a stable, rock-bolted sandstone <br />face. <br />The geotechnical investigation and stability analysis determined that the portal cut slope and <br />bench fills could not attain static slope safety factors in excess of 1.3, as required by Rules <br />4.14 and 4.27. After reclamation, the static slope safety factor would be less than 1.3. The <br />static slope factors attained by the reclaimed configurations represent decreases of less than <br />five percent of the existing stability factors for the same areas. <br />Bear Coal Company installed appropriate monitoring facilities in order to verify the stability <br />ofthe operational and reclaimed slope stability of the portal access road and portal facilities. <br />As provided for in the permit application, monitoring stopped two yeazs after the <br />reclamation of the road. <br />24 <br />
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