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- 12 <br /> - <br /> <br /> on parameters previously established for similar materials. <br />' Based on published data and our own experience with similar <br /> materials, we consider that the following material proper- <br />, ties-are appropriate for loose-dumped(non-compacted) fills <br /> consisting of the types of materials specified. <br />' <br /> SANDSTONE SANDSTONE/SHALE SHALE <br /> MIXTURE <br />' ~ ~ c 2S ~ c ~ m c <br /> 110 37 0 118 35 0 125 33 0 <br /> <br /> In the absence of specific test results, we consider that <br />' these parameters are suitable to use throughout the waste pile <br /> for stability analyses. They are probably conservative to some <br /> degree since compaction of the material should increase its <br /> shear strength. Also, experience with similar materials in- <br />' dicates that they can generally be oversteepened to some ex- <br /> tent by undercutting. This indicates that there is generally <br />' ~ cohesional component to the shear strength of such materials; <br /> this cohesional component has been neglected in our analyses. <br /> <br />' 4.0 PRELIPiINARY DESIGN RECOPII~FENDATIONS <br />' 4.1 SLOPE ANGLES <br />' Stability analyses have been performed assuming a re- <br /> alistic range of possible shear strength parameters for the <br /> waste rock. The heights of the pile sections analyzed have <br />il <br />200 f <br />it <br />b <br />d <br />d <br />i <br />id <br />b <br />i <br /> ase <br />ng a p <br />eet w <br />e at <br />s <br />een <br />eterm <br />ne <br />assum <br />e <br /> with sides sloped uniformly at the inclination specified. The <br /> actual height of the pile will be reduced somewhat by the in- <br />' <br /> cEO+noooconsmnsc.iNC. <br />