With a good sand stone roof the area explored may not be more than . . . . . . . . m2 at one stook extraction.
A. 20
B. 30
C. 50
D. 40
Answer: Option D
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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