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GENERAL45351
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Last modified
8/24/2016 8:14:26 PM
Creation date
11/23/2007 1:43:35 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981033
IBM Index Class Name
General Documents
Doc Date
4/10/1998
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR RN3
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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On November 17, 1997, Bear Coal Company personnel noted water flowing <br />from an area located immediately west of the sealed Edwards Mine Portal. This <br />spring is continuing to flow at approximately 37 gpm. Prior to this time, [he <br />abandoned Edwards Mine has not discharged mine water since its opening in <br />1934. It has not been determined if this recent discharge is in anyway associated <br />with the mine inflows reported at the Bear No. 3 Mine. The effect that this <br />discharge may have on groundwater resources cannot be determined until the <br />source of the water has been identified. <br />Bear Coal Company is not expected to disturb the aquifers that supply springs <br />adjacent to the permit area. The springs adjacent to the permit area are primarily <br />associated with sandstones in the Barren Member of the Mesaverde Formation. <br />These sandstones will not be affected by subsidence fractures. Rubbliza[ion <br />above the Bear No. 3 Mine workings is expected to extend several hundred feet <br />above the extracted B- and C-Seams. No fractures are expected to extend above <br />the sandstone at the top of the lower Coal Bearing Member. The limited vertical <br />extent of the subsidence-induced fracture system will ensure that springs in the <br />Barren Member are undisturbed. No disturbance of adjacent springs fed by <br />alluvial sources is expected because the mining will not be conducted under any <br />alluvial valley deposits. <br />The limited amounts of groundwater present in the B-Seam that will be disturbed <br />by mining at the Bear Mine will not result in any impact on any springs <br />associated with the B-Seam. Vertical subsidence-induced fractures will not <br />extend into aquifers that supply water to springs associated with the Barren <br />Member; therefore, no impact on these springs is anticipated. <br />No significant depletion of groundwater in the B-Seam is expected to result from <br />mining activities at Bear No. 3. Small amounts of water enter the mine from <br />walls, roof and floor in recently mined areas. These inflows reportedly cease <br />one to two weeks after the area is mined. The small inflows directly related to <br />mining and the lack of any recorded mine discharges indicate that there is a low <br />potential for significant impact to groundwater resources due to Bear Coal <br />Company's mining activities in the B-Seam. <br />However, due to the increase in B-Seam mining area that resulted from approval <br />of Permit Revision No. 2, it is likely that infiltration into the subsided B-Seam <br />may occur in volumes significant enough to cause discharge into the North Fork <br />of the Gurmison River via the B-Seam contact. If this occurs, the water is likely <br />to be of degraded quality, especially with respect to dissolved solids. It is not <br />believed that this will have a significant overall impact on water quality in the <br />North Fork of the Gunnison River. <br />Precipitation and snowmelt on the Bear No. 3 facilities area will infiltrate the <br />underlying alluvial material. The North Fork of the Gunnison River is <br />21 <br />
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