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we are attempting to develop a market for better use of this dust. <br />5. The quarry configuration is based on efficient usage and <br />the limitations of current quarrying equipment. The drill has an <br />effective depth limitation of 50 feet, and the dragline has a <br />maximum dump point at a horizontal distance of 120 feet, and a <br />vertical distance of 80 feet. Both pieces of equipment will <br />undoubtedly be replaced several times before the end of the <br />operation, and the plans changed to reflect efficient use~ge of the <br />new equipment. <br />6. No higher and better use for the quarry will. be found <br />during the life of the mine operation. <br />7. Constants used in calculations are as follows: <br />A. Average weight of quarry rock in place is 2.2 T per <br />cubic yard. <br />B. Average density of landfilled CKD is 45 lb. per cubic <br />foot. <br />C. Swell factor of excavated stripping is l.:i. <br />PRE-MINING TERRAIN <br />The Boettcher quarry site is in a semi-arid region with <br />approximately 13.5 inches of rainfall per year. The natural <br />vegetation on the Niobrara formation ranges from moderate grass <br />cover along certain bands, to scanty brushy cover on the snore rocky <br />• outcrops. The formation dips an average of 16 5 de2rep,S to the <br />east. The mos prominent ridge formers within the formation are <br />the A band, and the E3 band. Both have steep westward sloping <br />faces, often covered by rock rubble. In some places, rocky cliffs <br />are formed. The eastward slopes range from a dip slope in some <br />areas to a more gradual slope across the upper part of the section. <br />OPERATIONAL TIME-LINE <br />Past operations have quarried the A band to its present. economic <br />limit. The A band has been divided into 7 areas. Al is presently <br />being used by Colorado Lien, Inc., for a fill site for silica <br />sludge from the operation of their adjacent silica pl,snt. The <br />sludge is transported to the site by water, then the water is <br />decanted off and recycled to the silica plant. At the termination <br />of this operation, the sludge in the fill will be dewatered and the <br />fill covered and reclaimed with material from the adjacent <br />overburden piles. <br />A2 is presently the site of the CKD landfill. This landfill will <br />also be covered and reclaimed with material from the overburden <br />piles. It is estimated that this area still has a fill life of 9 <br />years. At that time the CKD landfill will be moved to E1, which <br />should be quarried out by that time. <br />C <br />. A3 is in use as a runoff water entrapment, supplying water for dust <br />suppressant operations on the CKD landfill. This u:>age will <br />