Room and pillar mining employed at depth below . . . . . . . . meters.
A. 100
B. 200
C. 300
D. 400
Answer: Option C
Related Questions on Coal Mining
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
Scaffold not required in . . . . . . . . tubbing
A. Over hung tubby
B. Under hung
C. Brick
D. Concrete
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