The Bureau of Mines investigated ground support problems in four major block-cave mines to assess the current state-of-the-art and to delineate areas for future research. The most significant problem is the inability of present support systems to hold moving ground. Further, as mining progresses to greater depth, this problem becomes more serious. Providing adequate temporary support capable of withstanding primary and secondary blasting is the next most significant problem. A detailed analysis of the effect of mining methods on support problems is also recommended for future research. (Out of print.)
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