Time taken to settle the goaf.
A. 1 - 2 year
B. 3 - 5 year
C. 5 - 8 year
D. 8 - 10 year
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 . . . . . . . .
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B. 600 l
C. 1100 l
D. 1200 l
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