北京首钢铁矿山
beijing shougang iron mine
采金船矿山
mine field of dredge work
储量危急矿山
Mines with critical resources reserves
大宝山铁铜多金属矿山
Dabaoshan polymetallic deposit
大型露天矿山
Large-scale open-pit mine
地下矿山装备
Undergound mining equipment
地质矿山辐射仪
geological mine radiation meter
非煤地下矿山
underground non-coal mine
non-coal underground mine