While working contiguous seams ventilation may be through
A. Main shafts
B. Bhore holes
C. Staple pit
D. Lower seam
Answer: Option C
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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