The process that sends sand water mixture in underground coal depillaring district is known as
A. Jigging operation
B. Gravity separation operation
C. Stowing operation
D. Coal drawing operation
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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