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• MORRISOWKNUDSEN COMPANY,INC. <br /> initiated at the request of Mid-Continent and authorized on June 21 , 1977. <br /> The results of these analyses were examined to determine the effect on <br /> previously developed results which had been based upon estimated material <br /> characteristics. <br /> The narrative materials which follow document the activities and re- <br /> sults of preliminary analyses based upon estimated material characteris- <br /> tics. The results of the. sampling and testing program is then addressed <br /> and comparison with previously developed results discussed. <br /> 1 .3 BASIC DATA <br /> In order to select a preliminary site for the future extension of <br /> the refuse pile, a number of factors affecting the selection of the lo- <br /> cation had to be considered. It needs to be emphasized, that the data <br /> (• regarding most of the factors were either assumed or extrapolated. Very <br /> little information was available regarding the physical characteristics <br /> of the refuse material and the foundation, the hydrological conditions, <br /> and the geometry of. the base of the present refuse pile. <br /> The factors affecting the refuse pile design are described below. <br /> 1 .3.1 Source of Refuse <br /> The source of refuse is the reject from the coal washing plant of <br /> the Mid-Continent Coal and Coke Company. The metallurgical grade coal is <br /> mined underground by both room-and-pillar and longwall mining methods. <br /> The present production rate is approximately 900,000 tons per year. <br /> The coal washing plant uses dense media separation of coarse fraction <br /> (+2"xl/4") , hydraulic concentration by tables on size 1/4"x65M, and froth <br /> flotation on finer fractions. The refuse is primarily a mixture of rock <br /> 1-4 <br />