The gas pumping out method during mining cliff features that during mining cliff, the desorbed gas from the mined and released coal layers to the 'annular crack circle' via crack channel formed through mining is pumped via the drilled holes or tunnel in the 'annular crack circle'. The 'annular crack circle' is located in the stratafugic crack band over the stoped out cliff inbreak band near return airway and intake airway in the coal mining face.
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