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What determines the need for secondary support in underground mines

This question belongs to Mining Engineering Mine Development And Mining Methods
Mine Development and Mining Methods
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What determines the need for secondary support in underground mines?

Answer & Solution
Correct Answer: Option C
Secondary support supplements primary systems when they are insufficient.The correct answer is: Primary support effectivenessFactors like convergence or new cracks may trigger need.Includes cable bolts, retimbering, etc.
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