Minimum life of mine should be more than . . . . . . . . years for adopting horizon mining.
A. 10
B. 20
C. 30
D. 40
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 . . . . . . . .
A. 800 l
B. 600 l
C. 1100 l
D. 1200 l
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