Why do we close the stoppings on intake & return airways simultaneously?
A. to prevent coal dust explosion
B. to withdraw man & machine from the district
C. to prevent methane explosion by delaying the possible formation of an explosive mixture
D. none of the above
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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