三下开采风险决策
Under three mining risk decision
安全高效开采
safe and high-efficient exploitation
good safety and efficiency
按煤种分层开采
mining in slices according to coal rank
坝料开采
Dam material quarry
exploitation ofmaterials for rock-fill dam
quarrying of dam construction material
borrowing of dam construction material
半连续开采工艺
Cyclic-flow mining technology
半潜式开采设施
semisubmersible production facility
傍河开采
exploitation near the river
保护层开采
protecting stratum mining
protected seam mining
protective coal seam mining
protecting seam exploitation
protective seam mining
protective coat extracted
protective layer
protected coal seam mining
protective layer mining
保水开采
water preserved mining
water-preserved-mining
aquifer-protective mining
holding-water-mining
Water-preserved Mining
water conservation mining
water-conserving mining