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l J <br />4.2.3 Diversion Channel Cut <br />Several minor failures have occurred within the di- <br />version channel cut portion that has been excavated in soils. <br />These failures indicate that the safety factors of the exist- <br />ing slope are very close to unity. For this reason, some <br />remedial measures will have to be undertaken in the future. <br />• <br />In our opinion, remedial measures could be undertaken <br />either in the near future, or, as in the case of the crush- <br />ing and screening level fill, after a period of careful <br />monitoring that would provide more reliable data on the geo- <br />technical and ground water conditions. Only long-term moni- <br />toring can indicate whether only shallow, surficial failures <br />(as they were indicated by the analyses and as they have ~~ <br />been observed in the field) are the most probable type of fail- <br />ure or whether a deep-seated failure could develop in the , <br />area. monitoring would also indicate whether ground water <br />may occur within the slope. i <br />' If the mine management decides to proceed with re- <br />i' <br />medial measures in the near future, we consider two alter- <br />I natives to be available to effectively increase the safety <br />factor of the slope. One alternative would be to reduce the <br />slope angle while maintaining a uniform gradient. A final <br />cut slope of 1.0(v) 1.5(h) would, according to our analyses <br />~~ presented in Appendix C, have a safety factor in excess of <br />~I 1.3 provided that the slope is fully drained. This may be <br />approved for final reclamation if adequate control over <br />~, erosion is provided. <br />A second alternative would be to increase the safety <br />Factor of the overall slope by constructing a toe buttress. <br />Safety factors which ~~ou1d be achieved by typical buttresses <br />• - 2f~ - <br />GFO-MYDVO CONSUnING. INC. <br />