Extraction of coal by caving system may be permitted upto a thickness of . . . . . . . . m only.
A. 3 m
B. 3.6 m
C. 4.2 m
D. 4.8 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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B. 600 l
C. 1100 l
D. 1200 l
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