During depillaring, no splitting or reduction of pillars should be done beyond a length of pillars ahead of . . . . . . . . pillar under extraction.
A. 4
B. 3
C. 2
D. 1
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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