While driving slices, what should be the minimum thickness of rib of coal to be left against adjacent goaf.
A. 1.8m
B. 1.5m
C. 1.2m
D. 0.8m
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
Join The Discussion