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steeper than 3H1V. A slope stability analysis of the worst case tailings pile has been conducted <br />and is included in Exhibit U. <br />Revenue Waste Rock and Tailings Pile <br />The central waste rock embankment is known as the Revenue waste pile, and will have a total <br />capacity of roughly 300,000 tons. This will satisfy the needs of Revenue for the first 3.0 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. The Revenue <br />waste pile will begin with the filling of the existing mine discharge lake (Revenue Pond), and <br />then be constructed in six inch lifts that slope towards the north at a roughly 2% grade. This will <br />protect the embankment from damage from avalanches during the life of the mine. The Revenue <br />waste pile will be constructed to have maximum slopes of 3H:1V. At its full construction the <br />waste pile will be 60 feet tall from the toe along Sneffels to the highest point on top. The average <br />height of the waste pile will be around 55 feet. However, most of this height will be provided by <br />the existing material, not the new Revenue waste. The initial grading of the Revenue waste pile <br />area can be seen on Map C -2, with the full pile build out shown on Maps C -3 and C -4. Currently, <br />the old pile slopes directly into the south bank of Sneffels Creek. This material will be carefully <br />excavated with a track hoe or backhoe so that the material is pulled back from the edge of the <br />Creek, leaving a 4 feet wide to 10 feet wide bench before the new constructed toe of the waste <br />pile starts to the south. This area will be vegetated in the 1 year after mine startup. <br />It is planned that the mine water from the Revenue portal will be allowed to drain into the waste <br />rock as shown in plan view on Map C -2 and the cross section A -A' on Map C -6. This water will <br />be allowed to seep into the waste rock through a series of perforated pipes in an east -west <br />direction just north of the existing Revenue Pond. The waste rock is blasted rock from the <br />driving of the Revenue tunnel and is very permeable. Recent test data on this permeability is <br />given below: <br />Revenue Mine August 2012 D -13 <br />