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i • <br />_ZD_ <br />1) Sunland Mining Corporation - Apex No. Z Mine, CMLRD Permit No. <br />C-Oll-81 <br />2) Pittsburg and Midway Coal Company - Edna Mine, CMLRD Permit No. <br />C-U01-80 <br />3)Colorado Yampa Leasing Company - Energy Mines No. 1, No. 2 and <br />the Eckman Park Mine, CMLRD Permit No. C-79-177 <br />4) Colorado Yampa Leasing Company - Energy Mine No. 3 and the <br />Middle Creek Mine, CMLRD file No. C-U36-81 <br />S) Peabody Coal Company -Seneca II Mine, CMLRD Permit No. C-005-80 <br />o") Sun Coal Company -Meadows No. 1 Mine, CMLRD File No. C-029-81 <br />7) Sun Coal Company - Trout Creek No. 2 Mine, CMLRD File No. <br />C-049-81 (This application has been withdrawn as of ???????????, <br />1983 at Sun Coal Company's request.) <br />8) Rockcastle Company - Grassy Creek Coal Mine No. 1, CMLRD Permit <br />No. C-039-81 <br />Mining operations include both surface and underground mining <br />operations. The Trout Creek Mine and the Foidel Creek Mine are proposed <br />underground mines. The proposed Foidel Creek operation is a revision to <br />the Eckman Park permit. <br />This assessment is divided into three major subsections: Description of <br />the Hydrologic Environment, Probable Hydrologic Consequences of Mining, <br />and Cumulative Hydrologic Impacts of Mining. Surface and ground water <br />are discussed seperately in each subsection. <br />Description of the Existiny Environment <br />A. Regional Geology <br />The sedimentary rock strata above the upper Yampa River Basin in Hayden, <br />Colorado has been intensely folded and fauited. Trout Creek, Oak Creek <br />and their tributaries flow through a very tightly folded synclinal basin, <br />the Twentymile Park Basin. This folding is related to the uplift of the <br />Park Range to the cast and the uplift of the Williams Fork Mountains and <br />White River Plateau to the south. <br />Eight active and reclaimed surface and underground coal mines rim the <br />Twentymile Park Basin, (Figure 3). This structural basin is a sub-basin <br />of the larger Sand Wash Basin. The Twentymile Park Basin consists of a <br />deep central basin flanked by two shallower basins to the north and <br />southwest. The southwestern basin is structurally connected to the Sand <br />Wash Basin by the doubly plunging Hayden Syncline. The Hayden Syncline <br />plunges to the northwest into the Sand Wash Basin and provides a limited <br />outlet to the Twentymile Park Basin. The tight folding of the <br />sedimentary rock strata within the Twentymile Park Basin has re suited in <br />faulting within the basin. <br />