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C~ <br />-4- <br />SPOIL PROPERTIES <br />Surface strip-type mining is presently occurring at several loca- <br />lions at the Energy Fuels Mine south of Steamboat Springs. The pro- <br />posed spoil disposal areas are part of an extension of an existing mine <br />operation. The overburden to be developed as excess spoil will be very <br />similar to materials presently being mined. To evaluate the nature of <br />overburden which would be used to construct the proposed disposal spoil <br />piles, we investigated spoil from the current operation. <br />ecific Gravit <br />The sandstone and shales which overlie the coal are exposed in <br />• existing cuts. Four samples which appeared to cover the range of <br /> typical materials in the exposed overburden were obtained. A <br /> description of the samples and the moist unit weight is presented <br />in the table below. <br />Sam le Description ~ecific Gravity Unit Weight <br />I Dark gray, massive shale 2.39 149 <br />II Light tan to gray sandstone 2.13 133 <br />III Banded gray shale 2.29 143 <br />IV Dark gray shale 2.35 147 <br />The specific gravity tests were performed on samples obtained from <br />bulk relatively intact pieces of the above described materials. The <br />average unit weight of the individual particles is 143 pcf. This <br />unit weight includes natural field moisture. <br />n <br />LJ <br />