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一、引言去年的现场负责人会议已有过报道,釜石矿山株式会社矿柱研究委员会曾就坑内结构的维护或安全开采问题,研讨了各矿柱对全局的影响及其今后的管理方针。研究结果断定,可以部分地回采7D矿柱,并可计入可
I. INTRODUCTION Last year’s meeting of field chiefs has been reported. Kumishi Mining Co., Ltd. Pillar Research Committee once discussed the impact of pillars on the overall situation and its future management policies on the maintenance or safe mining of pit structures. The result of the study concluded that 7D pillars can be partially recovered and can be accounted for