goaf,old waste 老塘(采空区) gob water,waste water 老塘水 Continuous Miner 连续采煤机 coking coal 炼焦煤 outcrop 露头 Roof collaspe 冒顶 mining concession 煤矿开采(特许)权 mine field 煤田 mudstone 泥岩 gob bleeder 排气孔(采空区) spalling rib 片...