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Rule 1.04 <br />• 2.04.4 Cultural and Historic Resource Information <br />A cultural resource inventory of approximately 500 acres in the proposed mine si[e was <br />conduced by the University of Colorado, Depar[ment of Anthropology, in October 1976. No <br />evidence of prehistoric or historic acivities was observed during this survey. A second <br />inventory of approximately 320 acres within Sections 30 and 31, TSN, R88W was conduced by <br />Pioneer Archeological Consultants in October 1979. Two sites were observed during this <br />second survey; a recent sheep camp or dump, and a small li[hic scatter. Neither si[e was <br />considered eligible for listing in the National register of Historic Places , Review of State <br />Historical Preserva[ion Office and Office of the Slate Archeologis[ files did not indicate any <br />reported or recorded sites within [he mine permi[ area. <br />Copies of the archeological resource inventory reports are provided in ,9ppendix C, I~olume !! <br />of [he original HGCC permi[ application. <br />2.04.5 General Description of Geology and Hydrology <br />R~ional Geology <br />The Hayden Gulch site lies within the Williams Fork Mountains neaz the southern edge of [he <br />Wyoming $asin physiographic province and immediately north of the White River Plateau, a <br />westward extension of the Sou[hern Rocky Mountains province. The Williams Fork Mountains <br />form [he uplifted area be[ween [he Axial Basin to the south and west and Yampa Basin to the <br />• north. <br />The sedimentary rocks above the upper Yampa River Basin near Hayden have been intensely <br />folded and faulted. This folding is related to [he uplif[ of the Park Range to the east and [he <br />uplift of [he Williams Fork Mountains and White River Plateau to the south. Strata in the <br />vicinity of the mine area dip 4 to 8 degrees northeast. <br />Geologic uni[s occurring with [he region vary in age from Late Cretaceous to Quaternary. The <br />oldest exposed sedimentary rocks are those of the Mancos Shale, which were deposited under <br />mazine and neaz-marine conditions. Above the Mancos, sedimen[s of the llles and Williams <br />Fork Formations of the Mesaverde Group were deposited in mostly terrestrial environments. <br />Sediments of [he Lewis Shale were then deposited in a predominan[ly marine environment. All <br />bedrock exposed in the Hayden Gulch area is of Upper Cretaceous age. Regionally, coal is <br />mined in both the Iles Formation and Williams Fork Formation of the Mesaverde Group. <br />Regional H}~drology <br />The mine azea is located within the Yampa River Basin of northwest Colorado. Within the <br />mine permit area, the only well defined and named drainage is Hayden Gulch which begins near <br />the northern permi[ boundary and flows south-southwesterly along an existing county road (CR <br />53) to the East Fork of the Williams Fork River approximately [hree miles south of the mine. <br />Hayden Gulch is an intermi[tent stream which typically only cazries water during spring runoff <br />and following summer thunder storms. The Williams Fork headwaters in the Flat Top <br />Mountains and flows into the Yampa River approximately 20 miles west-northwest of the mine <br />• site. The Yampa River and its tributaries comprise one of the major drainage basins in <br />Colcrado and is [ributary to the Green River approximately 90 miles downstream from [he <br />Yampa-Williams Fork confluence. <br />H:\811\PERM R\AULE3-w. HC <br />11/16/951:Japm mrs vcmr 2,04-4 Revised - 11/28/95 <br />