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steeper than 3H1 V. A slope stability analysis of the worst case tailings pile has been conducted <br />and is included in Exhibit U. <br />Revenue Waste Pile <br />The central waste rock embankment is known as the Revenue waste pile, and will have a total <br />capacity of roughly 333,000 tons. This will satisfy the needs of Revenue for the first 3.3 years of <br />the mine's life. Prior to the placement of any waste material, the area of the Revenue waste pile <br />will have to be regraded to accommodate new surface water control structures as well as the <br />Sneffels diversion pipe. The Revenue waste pile will begin with the filling of the existing mine <br />discharge lake, and then be constructed in six inch lifts that slope towards the north at a roughly <br />2% grade. This will protect the embankment from damage from avalanches during the life of the <br />mine. The Revenue waste pile will be constructed to have maximum slopes of 3H:1 V. At its full <br />construction the waste pile will be 60 feet tall from the toe along Sneffels to the highest point on <br />top. The average height of the waste pile will be around 55 feet. However, most of this height <br />will be provided by the existing material, not the new Revenue waste. The initial grading of the <br />Revenue waste pile area can be seen on Map C -2, with the full pile build out shown on Maps C -3 <br />and C -4. <br />Atlas Waste Pile <br />The Atlas waste pile will have a total capacity of roughly 811,000 tons. This will satisfy the <br />needs of Revenue Mine for an additional 8.1 years at the anticipated production, assuming no <br />waste rock is removed from the site. This waste pile will be constructed on the moderately flat <br />area west of the main Revenue mining area. Prior to construction of this waste pile, the area will <br />be regraded to provide a flat area for the pile and Sediment Pond 1 will be constructed. Due to <br />the size of the pile, and the issues presented by the topography south of the Atlas waste piles, the <br />diversion and collection structures for this pile will be built in stages. This will allow the <br />construction of a diversion ditch in easier to excavate material and on a gentler slope, saving on <br />initial cost. Prior to expanding the Atlas waste pile to full build -out, the new diversion and <br />collection structures will have to be constructed. These two sets of structures can be seen on <br />Revenue Mine August 2012 D - <br />