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Bord And Pillar Coal Mining Ppt Mtmcrusher

Bord And Pillar Coal Mining Ppt Mtmcrusher

Bord and pillar coal mining ppt Bord and pillar mining coal and coal mining te ara this diagram shows the traditional method of bord and pillar mining miners first extracted coal along roadways or bords while the coal in between the bords acted as pillars holding up the roof

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