The pillar is splitted into 2 or more stooks of the pillar size is more than . . . . . . . .
A. 25 × 25 sqm
B. 20 × 20 sqm
C. 18 × 18 sqm
D. 15 × 15 sqm
Answer: Option C
This Question Belongs to Mining Engineering >> Coal Mining
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C. 1100 l
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