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• Page 2 <br />Lease C-079641 <br />T, 5 N., R. 90 W., <br />sec. 5, lots 5 to 20, inclusive. <br />T. 6 N., R. 90 W., <br />sec. 32, lots 1 to 16, inclusive. <br />The areas described aggregate 1,351.84 acres. <br />Lease C-25948 <br />T. S N., R. 91 W., <br />sec. S, lots 5 and 8. <br />The area described contains 85.26 acres. <br />Description of Existing Environment <br />Trapper Mine is mining the H, I, Q, and R beds which are :in the Williams <br />Fork Formation of Upper Cretaceous age. There are other economically <br />important beds in the Williams Fork Formation: Y, R, A, B, C, D, E, F, <br />Wadge, Lennox, and Upper Pinnacle beds. <br />• The Williams Fork Formation is divided into three units. The upper and <br />lower units are divided by the Twentymile Sandstone. The Twentymile <br />Sandstone unit is composed of sandstone, interbedded shal~~s, and coal. The <br />Upper Williams Fork Formation overlies the Twentymile Sandstone and is <br />composed of interbedded sandstone, siltstone, sandy shale, and shale strata <br />with some coal beds. These coal beds will be surface mined. This unit <br />thickens from east to west and reaches a thickness of 850 feet in the <br />Trapper Mine area. <br />The Trapper Mine lies on the southern limb of the Big Bottom Syncline. The <br />axis of the Big Bottom Syncline trends east-west and passes beneath the <br />Craig generating station. The Trapper Mine area has an average strike and <br />dip of N 84° E. and 8° N., respectively. There are numerous rolls that vary <br />from 7° S. to 14° N. <br />According to Paul Williams and Calvin Jennings of the Colorado State , <br />University Archaeology Department, mining activities of Utah International <br />will not endanger any culturally valuable archaeological localities. There <br />appeared [o be no valuable minerals except coal on the lease area or any <br />conflict with oil and gas interests. <br />In the Yampa coal field, Pittsburg Mi_.:ay, Colorado Yampai, Peabody, and <br />Sunland are mining coal beds in [he Upper Coal Group of t:he Mesaverde Group. <br />Coal beds in the Lower Coal Group of [he Mesaverde Group are being mined by <br />• Colovyo and Utah International. The Coal Branch is currently making a <br />complete geologic study of the area and expects to have :c report completed <br />within a few months. <br />