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Protecting miners from coal bursts during development above historic mine workings in Harlan County,
In order to reach a large,untapped reserve of high-quality coal,D8 Cloverlick Mine proposed to mine a corridor nearly 60......
北洺河铁矿-95 m 水平4#采场进路联巷及回采进路在掘进过程中或成巷后不久就发生片帮冒顶,采用密集的 U 型可缩式金属拱架仍未能控......
