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Natural restrains on account of site altitude, site climate, etc. 5. Blasting restrictions and waste disposal practices of mine. 6. Financial bottlenecks or cost restrictions. 7. Other infrastructure available with mining 网页2022年11月15日 Techniques in Underground Mining Up-hole drilling and blasting leaves a rough rock surface for the roof; after mucking out, its height will be about 7.0 m. Before miners are allowed to enter the area, the roof must be secured by trimming the roof contours with smooth-blasting and subsequent scaling of the loose rock. 网页A benchmarking exercise of the blasting practices was conducted to evaluate the effect of the inconsistency on the mining cycle. After changes in the blasting practices the downtime was reduced, which improved the 网页licgmne mining in dehradun. 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