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location of the parting in the D seam is a physical boundary which <br />limits the recovery of D seam coal in the area. <br />The thin interburden between the D seam and H seam (less than 10 feet <br />in some areas) would preclude mining in both the B and overlying D <br />seams. The D seam has a higher clean coal reserve potential than <br />does the B seam. Therefore, mining of the D seam is a priority and B <br />seam coal is considered nonrecoverable. <br />Oil and Gas <br />All federal oil and gas minerals have been leased in this area. The <br />tract is covered by two oil and gas leases. The leases are C-37363 <br />in Section 36, T.3N., R.lO1W., and C-41356 in Section 1, T.2N., <br />R.lO1W. No exploration or production activities have taken place on <br />this tract. <br />The Rangely field, the largest producing oil field in Colorado, is <br />Located approximately 5 miles to the southwest. This field is pro- <br />ducing oil and gas from the following formations: Hancos, Horrison, <br />Entrada Sandstone, Chinle, and the Weber Sandstone. All of these <br />Eormationa are found at depths under the tract. <br />Locatable Hinerals <br />Low grade uranium occurs in coal beds of the Hesaverde Group a few <br />miles south of the Skull Creek district. Distribution of uranium in <br />the coal is unknown. No mining claims have been located within the <br />tract. <br />Saleable Hinerals <br />Alluvium and colluvium deposits consisting of rock debris, sand, <br />silt, and clay are found in minor amounts in the drainages of the <br />tract. <br />HydroLoRr <br />The Williams Fork Formation is divided into three hydrologic units: the <br />Lower Sandstone Facies, which underlies the "B" coal seam and is generally <br />equivalent to the Trout Creek Sandstone and the upper portion of the Iles <br />Formation; the Siltstone and Coal Facies, which consists of the interbed- <br />ded coal, siltatone, and shale strata of the Lower Williams Fork Forma- <br />tion; and the Upper Sandstone Facies of the Upper Williams Pork Formation. <br />A fourth hydrologic unit is the alluvium of the White River and its tribu- <br />taries. The maximum thickness of the White River alluvium near the lease <br />application area is about 37 feet. <br />No major usage of groundwater has been defined. Due to the generally Low <br />yields of aquifers in the region and poor water quality, it is net expect- <br />ed that groundwater usage would be high. Of the water rights that exist <br />within 70 square miles encompassing the lease application area, all are <br /> <br />9 <br />i <br />