A developed panel for a coal seam having incubation period of 6 months has 32 square pillars under extraction having size 25 m and height 3.0 m. Density of coal is 1.4 tonne/m3. Extraction ratio during depillaring is expected to be 75%. To depillar the panel within the incubation period, assuming 25 working days in a month, the production from the panel in tonne/day is
A. 420
B. 480
C. 560
D. 680
Answer: Option C
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