Vertical or steeply inclined openings is suitable for
A. shrinkage stoping
B. cut and fill stoping
C. square set stope
D. stope and pillar mining
Answer: Option A
A. shrinkage stoping
B. cut and fill stoping
C. square set stope
D. stope and pillar mining
Answer: Option A
A. Normal distribution
B. Skewed distribution
C. Lognormal distribution
D. Poisson distribution
A. 3 level heading district
B. 4 level heading district
C. 5 level heading district
D. 6 level heading district
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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