The width of rooms in room and pillar mining
A. 2 - 4 m
B. 4 - 6 m
C. 9 - 12 m
D. 6 - 9 m
Answer: Option D
This Question Belongs to Mining Engineering >> Coal Mining
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The required water for 1 ton of sand in hydraulic sand stowing is . . . . . . . .
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C. 1100 l
D. 1200 l
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