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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 assumed 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 lbs/ft3, the <br /> necessary storage volume for the next 20 years is about 540,000 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 /> Cy4.01 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 Ralston Creek <br /> and the possibility of increas ;ng the height of the existing piles. <br /> The existing waste piles are shown on Plate 5, Waste Piles - <br /> P resent 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 /> - 16 - <br />