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GENERAL51772
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Last modified
8/24/2016 8:37:53 PM
Creation date
11/23/2007 7:06:02 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981033
IBM Index Class Name
General Documents
Doc Date
12/11/2001
Doc Name
Federal Lease COC-42481 Part 8 of 8
Permit Index Doc Type
Other Permits
Media Type
D
Archive
No
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• Mining activities at the Bear Mine could reduce spring flows or eliminate <br />springs by intercepting the ground water or colluvial flows that supply the <br />springs. Ground water may be intercepted by dewatering of the coal seam <br />~ and adjacent roof and floor rock. Ground water in strata several hundred <br />feet above the extracted coal seam may be intercepted by vertical fractures <br />created by subsidence. <br />The Bear Mine currently does not intercept significant amounts of ground <br />water. The abandoned Edwards Mine has not discharged mine water since <br />its opening in 1934. No discharge of mine inflow water has occurred since <br />Bear Coal Company reopened the Edwards Mine. The lack of any recorded <br />discharge from the Bear Mine indicates that very little ground water has <br />been, or will be, intercepted by the mine workings. The lack of significant <br />mine inflows indicates that no significant disruption of any aquifer will <br />occur by Bear Coal Company's mining activities. <br />Bear Coal Company is not expected to disturb the aquifers that supply <br />springs adjacent to the permit area. The springs adjacent to the permit area <br />are primarily associated with sandstones in the Barren Member of the <br />Mesaverde Formation. These sandstones will not be affected by <br />subsidence fractures. Rubblization above the Bear No. 3 Mine workings is <br />expected to extend several hundred feet above the extracted B- and <br />• C-Seams. No fractures are expected to extend above the sandstone at the <br />top of the lower Coal Bearing Member. The limited vertical extent of the <br />subsidence-induced fracture system will ensure that springs in the Barren <br />Member are undisturbed. No disturbance of adjacent springs fed by alluvial <br />sources is expected because the mining will not be conducted under any <br />alluvial valley deposits. <br />The limited amounts of ground water present in the B-Seam that will be <br />disturbed by mining at the Bear Mine will not result in any impact on any <br />springs associated with the B-Seam. Vertical subsidence-induced fractures <br />will not extend into aquifers that supply water to springs associated with <br />the Barren Member; therefore, no impact on these springs is anticipated. <br />No significant depletion of ground water in the B-Seam is expected to result <br />from mining at Bear No. 3. Small amounts of water enter the mine from <br />walls, roof and floor in recently mined areas. These inflows cease one to <br />two weeks after the area is mined. The small inflows and the lack of any <br />recorded mine discharges indicates that no significant impact to ground <br />water resources will result from mining in the B-Seam. <br />Degradation of water quality in the alluvial aquifer below the Bear No. 3 <br />facilities area is not anticipated. The North Fork of the Gunnison River is <br />hydrologically connected to the alluvial material. Approximately 3,800 <br />acre-feet of water annually pass through the facilities area alluvial body. <br />• Precipitation and snowmelt on the Bear No. 3 facilities area will infiltrate <br />the alluvial material. The annual contribution to the alluvial material, <br />19 <br />
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