The width of the rooms in room and pillar method may be
A. 4 - 6m
B. 5 - 7m
C. 6 - 9m
D. 8 - 10m
Answer: Option A
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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