pillar blast
... 煤柱回采钻眼：pillar extraction drilling 煤柱爆破：pillar blast 煤柱：coal pillar ...
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煤柱回收采用深孔爆破的方法落煤，减少工人在工作面打眼的危险。
The method of coal cutting adopts deep-hole blasting and realizes no people in the face, this decreases risk when workers are working in the face.
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