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running in an arcuate line northward through the west central part of the basin shows <br /> displacement of 0 to 80 feet. Smaller lateral faults were encountered in the 9 Right and 10 Right <br /> gateroads while driving development out into the Eastern Mining District. <br /> The near surface bedrock units are composed of sedimentary rocks of marine and non-marine <br /> origin. These sedimentary rocks were formed through the transgression and regression of an <br /> epicontinental sea and are comprised of sequences of sandstones, siltstones, shales and coal. <br /> Four geologic formations exist in the vicinity of the Foidel Creek Mining Districts. They are, in <br /> ascending order, the Mancos Shale, the Iles and Williams Fork Formation of the Mesaverde <br /> Group, and the Lewis Shale. These strata were all deposited during the late Cretaceous Period. <br /> Generally, the strata dip to the center of the basin. <br /> Coal Seam Stratigraphy <br /> Three economically important coal seams, the Lennox, Wadge, and Wolf Creek coals, are <br /> located within the locally important Middle Coal Group of the Williams Fork Formation. At this <br /> time, the Wadge coal seam is the only seam being mined in the Foidel Creek underground mine. <br /> The Wadge Coal seam was strip mined in CYCC's adjacent Energy Mine No. 1, Energy Mine <br /> No. 2, and Eckman Park Mines (No. C-1981-071) and Energy Mine No. 3 (C-1984-062). <br /> The Wadge coal seam, in the area of the Foidel Creek Mine, is separated from the underlying <br /> Trout Creek sandstone by about 250 feet of interbedded sandstones, siltstones, shales and coals. <br /> The Wadge coal seam is separated from the overlying Twentymile sandstone by 700 feet of <br /> massive shale and interbedded sandstones, siltstones, shales and coals. Overburden depths in the <br /> current permit area range from 0 to 1,700 feet. <br /> TC also mines within the Wolf Creek Seam. TC was given approval to conduct development <br /> mining within this seam with the approval of TR83 in December of 2014. PR-10 proposes to <br /> update the mining plan to conduct development mining and longwall mining of this seam in the <br /> 5RT to 9RT longwall panels as depicted on Maps WC -23 and WC -23B dated July 6, 2015, <br /> proposed to be approved with PR-10. The Wolf Creek Coal Seam splits into four distinct <br /> benches, the combined total seam thickness ranges from 7.5 to 14 feet. Between the Wadge Coal <br /> Seam and the Wolf Creek Seams, there is interbedded sandstone and shales. Interbedded <br /> sandstones and shales and the massive Trout Creek Sandstone are below the Wolf Creek Seam. <br /> Surface Water Hydrology <br /> The mine is located in the upper reaches of the Yampa River Basin. The permit area and <br /> adjacent areas are drained by Foidel Creek, an intermittent stream, and Fish Creek and Middle <br /> Creek, both perennial streams. Fish Creek drains east into Trout Creek whereas Foidel Creek <br /> drains northeast to Middle Creek before Middle Creek joins Trout Creek. The quality of water in <br /> the Fish Creek and Foidel Creek drainages has been affected previously by surface mining <br /> upstream and downstream of the underground mine's existing surface facilities. Alluvial valley <br /> floors are identified downstream of the mining area at the confluence of Foidel and Middle <br /> Creek, and on Trout Creek from its confluence with Middle Creek downstream to the Yampa <br /> River. Permit Revision No. 3 declassified portions of Foidel and Middle creeks previously <br /> Foidel Creek Mine 9 August 4,2023 <br />