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What is the purpose of a crown pillar in underground mining...

This question belongs to Mining Engineering Mine Development And Mining Methods
Mine Development and Mining Methods
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What is the purpose of a crown pillar in underground mining?

Answer & Solution
Correct Answer: Option B
Crown pillar is a layer of unmined rock left between an underground mine and the surface.The correct answer is: Support overlying rock massIt prevents collapse and surface subsidence.Critical in near-surface deposits.
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