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GENERAL47107
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Last modified
8/24/2016 8:21:53 PM
Creation date
11/23/2007 3:09:26 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
General Documents
Doc Date
5/21/2004
Doc Name
Proposed Decision & Findings of Compliance for PR6
From
Continue Mining Northern Mining District
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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Williams Fork Formation of the Mesaverde Group, and the Lewis Shale. These strata were all deposited <br />during the late Cretaceous Period. Generally, the strata dip to the center of the basin. <br />Three economically important coal seams, the Lennox, Wadge, and Wolf Creek coals, aze located within <br />the locally important Middle Coal Group of the Williams Fork Formation. At this time, the Wadge coal <br />seam is the only seam being mined in the Foidel Creek underground mine. The Wadge Coal seam was <br />strip mined in CYCC's adjacent Energy No. 1 and Eckman Park Mines (No. C-81-071) and Energy Mine <br />No. 3 (C-84-062). <br />The Wadge coal seam, in the azea of the Foidel Creek Mine, is sepazated from the underlying Trout Creek <br />sandstone by about 250 feet of interbedded sandstones, siltstones, shales and coals. The Wadge coal seam <br />is sepazated from the overlying Twentymile sandstone by 700 feet of massive shale and interbedded <br />sandstones, siltstones, shales and coals. Overburden depths in the current permit area range from 0 to <br />1,700 feet. <br />The stratigraphy and geologic structure within the Twentymile Pazk Synclinal Basin control the ground <br />water flow within the permit and adjacent areas. There are three regional bedrock aquifers within the <br />permit and adjacent areas of the Foidel Creek underground mine. These aquifers aze the Trout Creek <br />sandstone, the Twentymile sandstone, and the Wadge coal-overburden zone. All three aquifers exhibit <br />artesian conditions in central portions of Twentymile Park Basin. The quality in all aquifers is moderately <br />poor but is tolerable for use as a drinking supply. <br />The geologic structure created by folding and faulting within the Twentymile Pazk Synclinal Basin affects <br />the direction of flow within the rock aquifers. Tn the permit and adjacent areas, the direction of Bound <br />water flow in the bedrock aquifers is down dip towazd the center of the Twentymile Pazk Basin. Faults in <br />the area produce localized fracture zones within the rock strata These zones of increased permeability, in <br />turn, increase the potential for vertical and horizontal movement of ground water within the rock strata. <br />However, experience to date in the Foidel Creek mine shows little to no inflow along the fault zones at the <br />level of the Wadge coal seam. Some inflows were encountered in 9R, and 6R gateroad as they were <br />developed into the Eastern Mining District. These inflows appeazed to be localized, and tapered off over <br />time. <br />The Twentymile sandstone is separated from the underlying Wadge coal-overburden aquifer by up to 700 <br />feet of impermeable shale within the permit and adjacent areas. The underlying 700-foot shale and the <br />overlying shales and siltstones of the upper Williams Fork Formation and the Lewis Shale Formations <br />produce the confined artesian conditions within the Twentymile sandstone aquifer. To the northeast, the <br />Twentymile sandstone rechazges the alluvial aquifer and provides base flow to the tributaries of Trout <br />Creek down gradient of the mine. Salts in the Twentymile sandstone waters are predominantly sodium <br />bicazbonate and result in TDS levels of 150 mg/1. This aquifer is occasionally used for domestic needs. <br />The alluvium of Trout Creek and its tributazies is an important source of ground water. The alluvial bodies <br />ate used as water supplies, provide subirrigation to vegetation, and supply base flow to the streams. The <br />alluvial bodies aze rechazged by both the streams and the bedrock aquifers. <br />The mine is located in the upper reaches of the Yampa River Basin. The permit area and adjacent areas <br />aze drained by Foidel Creek, an intermittent stream ,and Fish Creek and Middle Creek, both perennial <br />streams. Fish Creek drains east into Trout Creek whereas Foidel Creek drains northeast to Middle Creek <br />before Middle Creek joins Trout Creek. The quality of water in the Fish Creek and Foidel Creek drainages <br />have been affected previously by surface mining upstream and downstream of the underground mine's <br />existing surface facilities. Alluvial valley floors are identified downstream of the mining area at the <br />5 <br />
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