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• <br />• <br /> <br />safety factors already exceed 1.3. Safety factors for shal- <br />low failure surfaces which would appear as sloughing of the <br />fills are lower, being approximately unity for fills con- <br />structed at their angle of repose. <br />We recommend that all fills be reclaimed to an overall <br />slope angle of 1(v):2.0(h). Provided that the fills are kept <br />effectively drained, our analyses indicate that this will re- <br />sult in a safety factor against shallow failures in excess of <br />1.3, similar to the critical safety factor of the reclaimed <br />crushing and screening level fill. The safety factor against <br />sliding along the original ground surface should exceed 1.4. <br />4.4.3 Diversion Channel Cut <br />61e believe that reconfiguration of the diversion channel <br />cut should be undertaken in the near future, since this cut <br />currently shows signs of instability. Any alterations made <br />to this cut would be designed such that the resulting safety <br />factor for the stability of the overall slope exceeds 1.3. <br />Revegetation of this slope should be undertaken prior <br />to final reclamation of the site. If the slope can be shown <br />to have been stable and adequately revegetated for an extend- <br />ed period prior to abandonment of the site, no further modi- <br />fications should be required for final reclamation. <br />4.4.4 Other Soil Cuts <br />Ide recommend that the final reclamation of other soil <br />cuts at the site be decided based on the performance of the <br />cuts during the operating life of the mine. If these cuts <br />show no signs of instability over a prolonged period and are <br />satisfactorily vegetated, it may be preferable to leave the <br />- 35 - <br />GEONVDPO CONSULTING, INC. <br />