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A-4 <br />1 <br />1 <br />1 <br />1 <br /> <br />1 <br />1 <br />1 <br /> <br /> <br />face ravelling or slumping. The factor of safety against deep- <br />seated failures of the waste material is higher. <br />The case of the waste pile constructed at a slope of <br />1.0 (v) 2.0 (h) is indicated to have an acceptable safety <br />factor (greater than 1.50) for the case of a waste material <br />composed principally of sandstone, for which a safety factor <br />of 1.52 was calculated. For a sandstone/shale mixture, the <br />calculated safety factor falls to an unacceptable 1.41, and <br />decreases further to 1.30 for a pile composed of shale at <br />this configuration. <br />If the waste rock pile is constructed at a slope of <br />1.0 (v) 2.25 (h), calculated safety factors are 1.60 for <br />a sandstone pile, 1.57 for a sandstone/shale mixture, and <br />1.46 for a pile composed principally of shale. The safety <br />factor falls below 1.50 only for the case of a pile consist- <br />ing entirely of shale, for which the safety factor is only <br />marginally below 1.50. <br />For a pile constructed at a <br />the corresponding safety factors <br />pile, 1.76 for a sandstone/shale <br />consisting principally of shale. <br />of any potential composition exc <br />of 1.5. <br />slope of 1.0 (v) 2.5 (h), <br />are 1.89 for a sandstone <br />mix, and 1.62 for a pile <br />At this configuration, piles <br />eed the required safety factor <br />Our analyses indicate that piles constructed at a slope <br />of 1.0 (v) 3.0 (h) would have very high safety factors. These <br />are calculated to be 2.28 for a sandstone pile, 2.11 for a pile <br />composed of a sandstone/shale mix, and 1.96 for a shale pile. <br />SCability under applied earthquake loads was evaluated <br />using horizontally applied, pseudo-static earthquake forces <br />of 0.05 g and 0.10 g applied to a pile constructed at <br />~maocorawinwc.iNC. <br />