Size of pillars is decided based on
A. nature of roof and floor
B. time dependent strain
C. depth from surface
D. coal strength
Answer: Option C
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A. 3 level heading district
B. 4 level heading district
C. 5 level heading district
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It is very difficult to control shaley roof if coal is not left with the shale why?
A. It is weak in nature
B. It has weathering effect
C. It has great affinity to absorb moisture and get departed from immediate roof
D. It reacts with coaly surface
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