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Mining Engineering Coal Mining Difficulty: Medium

Pillar and stall method also known as

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Which of the following system is used to working out the reduce levels of points from the staff readings taken in the field. The machine employed for pushing loose material (or) for digging in earth and sand is . . . . . . . . CO 2 is best suited for extinguisher Carbonisation process calssified into . . . . . . . . types. Shattering effect produced by using . . . . . . . .