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effected by slope failure. The mine floor lies on bedrock (shale) <br />that is a stable formation not disturbed by mining. There is no <br />indication of slope failures of this material in the vicinity so <br />we do not expect a problem during mining or when reclamation is <br />complete. Removal of the gravel deposit over this shale will <br />reduce the loading only reducing the forces acting on it that may <br />cause failure. The bases of all structures along the south side <br />of the permit area including the Box Car Ranches access road, wire <br />fence, chain-link fence, power and communications lines are below <br />the mine floor. <br />The material in the mine wall will be in-place gravel and <br />assumed to be cohesionless and having a friction angle (0) of 35°. <br />Factors shown in the following table are calculated using the <br />formula FS = Tan(D =Tang, where e is the slope of the angle <br />Slope Evaluated Calculated Factor of Safety <br /> slope angle for (D=35° <br />Proposed slope 26.6° 1.39 <br />Slope toe to North 19.42°(1) 1.99 <br />Fence <br />(1)19.42° angle is calculated from 30 feet slope height and 85 feet horizontal from toe to fence <br />26a