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Highwall Reduction <br />Assume mining at a 1H:1V slope and max. height of 80 ft and max. length up to 1,200 ft <br />Total volume of material to be moved by D8 dozer to create 3H:1V slope calculated: <br />900 ft X 11600 ft2 = 1,440,000 ft3 X (1/27) = 53,333 yd3 <br />-.. -- --f.. r 7 nn la <br />80 ft <br />vvjL vv Ja --J.