Shale as immediate roof in underground, coal mine is not suitable because
A. It is difficult to support
B. It gives less waning prior to fall
C. It has high affinity to moisture & departs from roof easily
D. It gives bad sound while testing
Answer: Option C
This Question Belongs to Mining Engineering >> Introduction To Mining Engineering
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It is very difficult to control shaley roof if coal is not left with the shale why?
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B. It has weathering effect
C. It has great affinity to absorb moisture and get departed from immediate roof
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