Maximum supports are required within 10 m of freshly-exposed roof-why?
A. concentration of maximum person are there in the face
B. that portion generally remain unsupported due to violence of blasting & incumbent strata pressure is shifted towards pillar edge
C. this is the only place of working in the district in a mine
D. it is easy to install supports at the face
Answer: Option B
This Question Belongs to Mining Engineering >> Introduction To Mining Engineering
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