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1. Continuous Collection of Structural Data <br />• <br />t <br />r <br /> <br /> <br /> <br />L <br />L• <br />There are many advantages that derive from knowledge of the structural <br />pattern of the rock slope as the pit is excavated and mining progresses, <br />particularly if some instability is anticipated. The advantages relate <br />to avoidance of failure through appropriate changes in the mining plan, <br />if such are feasible, and/or to scheduling of the failure in order to <br />minimize the impact on the total operation. The slope behavior caii be <br />studied and predicted from studying the accumulated structural data. <br />Data presently on hand have aided in the preliminary design of pit slopes <br />for the purpose of feasibility studies of mining plans. However, the <br />structural pattern of the rock obtained from outcrops may or may not <br />continue to be valid throughout the extent of the pit slope face. It <br />is recommended that a fracture set survey program be initiated when the <br />pit is excavated and be continued throughout the life of the pit. The <br />fracture set survey could be incorporated into regular mapping of working <br />faces in the pit, placing special emphasis on faults and evidences of <br />ground water. Notation should be made of the strikes, dips, visible <br />extent, and, in case of faults, thicknesses, gouge material and hanging <br />wall and footwall rock types. Any water associated with a particular <br />fault should also be noted. <br />2. Ground Water Monitoring <br />It is recommended that periodic water level readings be made in the holes <br />currently monitored by the llSGS before and after the mining commences. <br />The data will be very useful in determining the effect of the mining on <br />perched or ground-water conditions in the backslope. <br />3. Placement of Mine Waste Rock <br />It is understood that Colowyo is currently planning to dump the mine waste <br />rock within the mine property, most of which would be pit-excavated. The <br />W R.WAHLEH Project 0807 III-4 <br />& RSSOCIAi6 <br />