In an underground coal mine, a freshly exposed roof can be supported by a temporary support in the form of
A. Triangular chocks
B. Screw props
C. Safari supports
D. Hydraulic props
Answer: Option C
This Question Belongs to Mining Engineering >> Introduction To Mining Engineering
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A. 3 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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