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In an underground mine output from the panel is 360 tpd...

This question belongs to Mining Engineering Introduction To Mining Engineering
Introduction to Mining Engineering
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In an underground mine output from the panel is 360 tpd, having 26 days of working in a month where incubation period of coal is 9 month. If recovery from the panel is 80% and pillar size is 30 m × 30 m, height 3 m, coal sp. gravity 1.8 then find out number of pillars in the panel.

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Correct Answer: Option B
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