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<br />t' <br />~- J <br />C~ <br /> <br />'.. <br />C<.~. <br />I'j~' '-', <br />~':<iP <br /> <br />..<<.<.~..'. <br />;",,-- <br />,.'-.- <br /> <br />11.-17-71. <br /> <br />COAL RESERVES IN THE NUCLA AREA <br /> <br />The Nucla-Naturita coalfield is defined by the U. S. Geo- <br /> <br /> <br />logical Survey as an area in Montrose County near the towns of <br /> <br />Nucla and Naturita. The coalfield is part of the Dakota sand- <br /> <br />stone formation where coal beds are more persistent than most <br /> <br />coal occurrences found in the formation. <br /> <br />The U. S. Geological Survey estimated coal reserves of the <br /> <br />Nucla-Naturita coalfield. According to the U. S. Geological <br /> <br />Survey, the reserve area originally contained an estimated 114 <br /> <br />million tons of bituminous coal. The reserve tonnage was reported <br /> <br />for measured and inferred categories, but not for individual <br /> <br />coal seams. <br /> <br />The 114 million ton original reserve estimate for the three <br /> <br />beds found in the Nucla area is shown below: <br /> <br />Bed <br /> <br />Estimated Tons in <br />Measured Inferred <br />Millions Millions <br /> <br />Place <br /> <br />Total <br />Millions <br /> <br />Upper <br />Middle <br />Lower <br /> <br />2.54 <br />25.72 <br />14.56 <br /> <br />38.87 <br />32.65 <br /> <br />2.54 <br />64.59 <br />47.21 <br /> <br />Total <br /> <br />42.82 <br /> <br />71.52 <br /> <br />114.34 <br /> <br />The measured classification extends to about three-fourths <br /> <br />mile from observation points, and the inferred classification <br /> <br />extends up to two miles from observation points. <br /> <br />Remaining coal reserves are the estimated original reserves <br /> <br />less coal production and the reserves lost or made unrecoverable <br /> <br />by mining. Assuming a 90 percent recoverability factor for the <br />