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-~ STEEPEN ROBERTSON 8 KIRSTEN <br />Homestake Mining Company <br />July 25, 1984 <br />Page -6- <br />should ultimate]y bey performed:'"If movement; continues at the current rate, <br />this mat" be.. inEreasei~im~.bh~r~ate~ot~:novanent takes <br />places/: zatiort should be performed to prevent Ingress ot'" the tailed <br />materfaT'into the drainage from the pit. <br />Summary <br />Generally, the Pitch project waste rock dumps remain stable with <br />settlement and minor surface movement within anticipated limits. Surface <br />drainage of the dumps should be established and maintained to prevent any <br />significant erosion features from developing. Reference should be made to the <br />overall drainage plan as given in SRK technical memorandum, "Drainage and <br />Erosion Control for the Pit and Dump Areas for Final Reclamation, Pitch <br />Project," September 1983. Action to increase the stability of both the Tie <br />Camp and Indian Creek dumps should be taken. Where possible, the Tie Camp dump <br />should be regraded to its ultimate reclamation shape and its subdrain <br />reestablished. The Indian Creek dump's proposed rock toe should be <br />constructed to stop further migration of saturated gouge material. Regrading <br />and improvement of drainage around the upper low-grade stockpile should be <br />performed. <br />Respectfully submitted, <br />Steffen Robertson and Kirsten <br />jColorado) Inc. <br />Rob Dorey, P.E. <br />Project Manager <br />