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stable configuration of the waste dump is currently being investigated <br />by W. A. Wahler and Associates. Regardless of the configuration of the <br />^ <br />engineered dumps, they should be located so that the toe of the dump <br />will be outside given width limits From the crest of the pit slopes. <br />Also, the dumps should be constructed in such a manner that no water <br />can be impounded. <br />4. Design of Blasting Pattern <br /> <br /> <br />L <br /> <br />L <br />L <br />The investigation indicates that the sandstone and siltstone beds would <br />require blasting, depending on the equipment for ripping. In the begin- <br />ning of the excavation stage, the bench blast patterns and the quantity <br />of powders required should be determined. The design of the pattern <br />would largely depend on the size of benches to be maintained and the local <br />rock characteristics. The patterns are necessarily determined by the <br />trial-and-error method. Rock strengths in the mine area suggest that the <br />initial trial pattern be about 20 to 25 feet hole spacing, depending on <br />the blast hole size and the bench height. Once the blast patterns are <br />established, the field engineer or geologist could plan the blasting <br />in any area by the local rock characteristics <br />W.A.WAHLER Project 0807 III--S <br />E & ASSOCIATES <br /> <br />• <br />• <br />