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This question belongs to Mining Engineering Coal Mining

Coal Mining

?

In shallow mines, to prevent breathing of air to the depillared area through cracks on surface, the cracks are blanketted with a layer of sand nearly . . . . . . . . meters thick.

A) 1 m B) 1.8 m C) 2 m D) 1.2 m

Answer & Solution

Correct Answer: Option D

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Question posted by Examveda

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