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• 2.04.4 Cultural and Historic Resource Information <br />Rule <br />A cultural resource inventory of approximately 500 aces in the proposed mine site was conducted by the <br />University of Colorado, Department of Anthropology, in October 1976. No evidence of prehistoric or <br />historic activities was observed during this survey. A second inventory of approximately 320 acres within <br />Sections 30 and 31, TSN, R88W was conducted by Pioneer Archeological Consultants in October 1979. <br />Two sites were observed during this second survey; a recent sheep camp or dump, and a small lithic <br />scatter. Neither site was considered eligible for listing in the National Register of Historic Places . Review <br />of State Historical Preservation Office and Office of the State Archeologist files did not indicate any <br />reported or recorded sites within the mine permit azea. <br />Copies of the archeological resource inventory reports aze provided in Appendix C, Volume II of the original <br />HGCC pertnit application. <br />2.04.5 General Description of Geology and Hydrology <br />Regional Geolo <br />The Hayden Gulch site lies within the Williams Fork Mountains neaz the southern edge of the Wyoming <br />Basin physiographic province and immediately north of the White River Plateau, a westwazd extension <br />of the Southern Rocky Mountains province. The Williams Fork Mountains form the uplifted azea between <br />the Axial Basin to the south and west and Yampa Basin to the north. <br />The sedimentary rocks above the upper Yampa River Basin neaz Hayden have been intensely folded and <br />• faulted. This folding is related to the uplift of the Park Range to the east and the uplift of the Williams <br />Fork Mountains and White River Plateau to the south. Strata in the vicinity of the mine area dip 4 to 8 <br />degrees northeast. <br />Geologic units occurring within the region vary in age from Late Cretaceous to Quaternary. The oldest <br />exposed sedimentary rocks are those of the Mancos Shale, which were deposited under marine and neaz- <br />marine conditions. Above the Mancos, sediments of the Ines and Williams Fork Formations of the <br />Mesaverde Group were deposited in mostly terrestrial environments. Sediments of the Lewis Shale were <br />then deposited in a predominantly marine environment. All bedrock exposed in the Hayden Gulch azea <br />is of Upper Cretaceous age. Regionally, coal is mined in both the Iles Formation and Williams Fork <br />Formation of the Mesaverde Group. <br />Regional Hydrology <br />The mine area is located within the Yampa River Basin of northwest Colorado. Within the mine permit <br />azea, the only well defined and named drainage is Hayden Gulch which begins neaz the northern permit <br />boundary and flows south-southwesterly along an existing county road (CR 53) to the East Fork of the <br />Williams Fork River approximately three miles south of the mine. Hayden Gulch is an intemuttent stream <br />which typically only cazries water during spring runoff and following summer thunder storms. The <br />Cilliams Fork headwaters in the Flat Top Mountains and flows into the Yampa River approximately 20 <br />miles west-northwest of the mine site. The Yampa River and its tributazies comprise one of the major <br />drainage basins in Colorado and is tributary to the Green River approximately 90 miles downstream from <br />the Yampa-Williams Fork confluence. <br />J <br />2.04-4 Revised - 06/01 <br />