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How Did Miners Know Where To Mine Coal

Coal, salt, uranium, phosphate and oil shale live in soft rock and there are two primary methods in soft-rock mining: longwall and room and pillar [source: Great Mining].Most coal is extracted using the room-and-pillar approach described previously [source: United Mine Workers of America].However, longwall mining is exploding in popularity [source: Great Mining]. Our main products include crushing equipment, sand making equipment, beneficiation equipment, grinding equipment and building materials equipment, welcome to purchase;

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