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<br />• It is thus estimated that approximately 40,000 tons of non••differen- <br />tiated waste will be produced in each year. It has thus been as>umed that <br />a total additional storage for future waste will be on the order of <br />800,000 tons. Assuming the density of the waste of 110 lb~;/ft3, the <br />necessary storage volume for the next 20 years is about 54(1,000 yd3. <br />Estimates of required yardages for the remaining 20 year mine <br />life have been used for the purposes of this study. <br />4.0 WASTE PILE EXPANSIONS AND GEOTECHNICAL STABILITY <br />4.1 Waste Pile Expansions <br />The scope of this study requires the analysis of the stability <br />of the existing waste piles, of waste piles as they will be built during <br />• the remaining 20 years of mine operation and of the expected pile con- <br />figurations after they have been reclaimed. It was necessary to evalu- <br />ate the present configurations of the waste piles, to evaluate the <br />possibilities of expansion of the existing piles along Ral~.ton Creek <br />and the possibility of increasing the height of the existing piles. <br />The existing waste piles are shown on Plate 5, Wasi:e Piles - <br />Present Locations and Volumes. Waste rock volume calculations, based <br />on the existing topographic maps, profiles that have recently been <br />surveyed by Cotter, and on the topographic maps showing premining <br />topography, indicate that the approximate volume of waste material <br />presently in the west pile is 117,000 yd3 and in the east pile 159,000 <br />yd3. The west pile covers approximately 2.9 acres and the east pile <br />approximately 3.5 acres. The volume calculations are based on a <br />series of sections located as indicated on Plate 5, and presented on <br />Plates 8 and 9. <br />• <br />- 16 - <br />