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Which mining layout includes rooms and pillars of unmined ore

This question belongs to Mining Engineering Mine Development And Mining Methods
Mine Development and Mining Methods
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Which mining layout includes rooms and pillars of unmined ore?

Answer & Solution
Correct Answer: Option B
Room and pillar leaves parts of the ore as pillars for support.The correct answer is: Room and pillarCommon in coal and flat-lying bedded deposits.Pillars may be later recovered in retreat mining.
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