Drilling with manual labour without help of power is suitable upto a depth of
A. 20 m
B. 30 m
C. 40 m
D. 50 m
Answer: Option B
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 . . . . . . . .
A. 800 l
B. 600 l
C. 1100 l
D. 1200 l
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