Q80
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
AnswerD.
680
Answer: Option C
Solution
Answer: Option C
No explanation is given for this question Let's Discuss on Board