Q96
40 × 40 m centre to centre size of coal pillar in bord and pillar working, at a depth of 280 m has 4 m wide gallans. What area of roof does a pillar support according to tributary area.
A.
1600
AnswerB.
1296
C.
1120
D.
1936
E.
4480
Answer: Option A
Solution
Answer: Option A
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