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This question belongs to Mining Engineering Coal Mining

Coal Mining

?

When the stratas are well stratified sand stone or shales, the local fall will take place within . . . . . . . . hours, after withdrawal of supports.

A) 12 - 24 B) 10 - 12 C) 24 - 48 D) 48 - 72

Answer & Solution

Correct Answer: Option C

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Question posted by Examveda

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