room and pillar mining pulling pillars china
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room and pillar mining pulling pillars china

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room and pillar mining pulling pillars china

3.3 in Aumance . ... icantly developed in , was identified as a top priority thick seam method compared to the other ... will be extracted, and the remaining coal will be left unmined for roof support and ... position. The lower and the up-dip shield are then lowered, up to the floor.

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