The purpose of lining of bore hole
A. Prevent water percolation
B. Easy drilling operation
C. Prevent caving in of sides
D. None
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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