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C Factor for Colowyo Mine <br /> Pre-Mining Post-Mining <br /> Parameter (Ref Area) (Revegetation) <br /> Canopy Cover(%) 28.71 37.64 <br /> Rock Cover(%) 1.54 2.40 <br /> Litter Cover (%) 42.97 47.18 <br /> Fall Height (ft) 0.5 0.5 <br /> Effective Root Mass (lbs/ac) 861 1129 <br /> Roughness (Index) 0.8 1.1 <br /> Land Use (Index) 4 4 <br /> C-Factor 0.0281 0.0163 <br /> Conservation Practice Factor P <br /> The P factor quantifies conservation practices employed at Colowyo. A default value of 1.0 was used <br /> for Pre-Mining conditions. A conservative P-factor estimate of 1.0 was also used for Post-Mining conditions. <br /> RUSLE Results Summary <br /> Table 3 presents the predicted soil loss in tons/acre/year for two representative slopes from the Phase <br /> II bond release block for pre-mining and post-mining evaluations. The pre-mining representative slopes <br /> exhibited 0.252 and 0.092 tons/acre/year of predicted soil loss, respectively. In comparison, the post- <br /> mining representative slopes exhibited 0.137 and 0.060 tons/acre/year of predicted soil loss, respectively. <br /> Table 3 - A (soil loss in tons/acre/year) for Colowyo Mine <br /> A B <br /> Parameter Pre-Mining Post-Mining Pre-Mining Post-Mining <br /> R - Factor 19 19 19 19 <br /> K- Factor 0.255 0.228 0.255 0.228 <br /> LS- Factor 1.847 1.936 0.679 0.846 <br /> C- Factor 0.0281 0.0163 0.0281 0.0163 <br /> P- Factor 1.0 1.0 1.0 1.0 <br /> A (soil loss in tons /acre/year) 0.252 0.137 0.092 0.060 <br /> 16 <br />