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coal mining in karnataka ppt

coal mining in karnataka ppt

COAL|authorSTREAM. Undergroundmining: UndergroundminingRoom and pillar is the more traditional method with long wallminingonly being made possible in this century due to new technology In room and pillar, rectangular portions of thecoalare blasted, with pillars left in place for support In long wallmining, the roof is temporarily supported by theminingmachine which shears thecoal...

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