In the residual coal mining, the retaining and non-mining pillars in the mined area in the past are for resumption of mining.
残煤开采是将过去已开采区留下的煤柱、不可采的煤柱，再进行复采。
In the residual coal mining, the retaining and non-mining pillars in the mined area in the past are for resumption of mining.
残煤开采是将过去已开采区留下的煤柱、不可采的煤柱，再进行复采。
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