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vibratory screen, jaw crusher and stacker will be placed on site to process waste rock for <br />potential sale. All waste rock that leaves the mine portal is <8 inches in size (based on historical <br />experience with this mine) and will be crushed down to <1.5 inch. Since the amount of waste <br />rock that might sell is not known, the waste piles are designed to contain all waste rock generated <br />at the Revenue Mine. Waste rock will be limited to roughly 20% of the material placed in a <br />waste pile per lift. This will help to ensure sufficient compaction is achieved. <br />A large portion of the Revenue waste pile is in a historic avalanche path that experiences <br />avalanches on nearly an annual basis. An avalanche can occur from the months of December <br />through May. The avalanche path is shown on Mine Maps C -2, C -3 and C -4. Due to the <br />avalanche threat, grading and compaction of the waste lifts will only be conducted in the summer <br />and fall (June through November). Haul trucks will convey tailings or waste rock across the pile <br />during the winter and place in a temporary pile on the west side of the avalanche path. This pile <br />will be regraded into the necessary lifts each summer. At 95,000 tons of total waste produced per <br />year, approximately 49,000 tons will have to be stored in the temporary stockpile during the <br />winter. <br />A shallow piezometer will be placed on the north (downhill side) of each tailings pile as shown <br />on Map C -3. These piezometers will initially be sampled quarterly for field parameters of <br />temperature, pH, conductivity and water level. Additionally, samples of water from the <br />piezometers will be tested with full suite analysis using the same parameters of the ground water <br />suite for all recent samples will be conducted every six months. The results of these tests and <br />their evaluation will be incorporated in the DRMS Annual Report. Also, sample test data from <br />any sediment pond discharges will be evaluated in the Annual Report. <br />At either of these piles, dozers will compact the waste in 6" lifts to a 94% maximum dry density. <br />A secondary compactor will be used if needed to achieve the proper compaction. Quality control <br />density samples of the compacted waste will be conducted using a field density instrument every <br />2000 tons of tailings that are placed. As described in the Mine Plan, the piles will have slopes no <br />Revenue Mine August 2012 D - <br />