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In a coal mine the depth of working is 200 m...

This question belongs to Mining Engineering Introduction To Mining Engineering
Introduction to Mining Engineering
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In a coal mine the depth of working is 200 m from surface, width of galleries 3 m, height of galleries 3 m and distance of square pillars between centres of bords is 22.5 m. What is strength of the pillar

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Correct Answer: Option D
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