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Which one is a non-entry mining method

This question belongs to Mining Engineering Mine Development And Mining Methods
Mine Development and Mining Methods
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Which one is a non-entry mining method?

Answer & Solution
Correct Answer: Option D
In-situ leaching involves extracting minerals by dissolving them underground.The correct answer is: In-situ leachingNo physical entry is required into the ore zone.Used for soluble minerals like uranium or copper.
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