Which method involves retreating while extracting support pillars?
A. Block caving
B. Longwall mining
C. Retreat mining
D. Sublevel caving
Answer: Option C
Solution (By Examveda Team)
Retreat mining removes pillars during withdrawal from a mined area.The correct answer is: Retreat miningCommonly used in coal mines.Requires high monitoring due to collapse risk.This Question Belongs to Mining Engineering >> Mine Development And Mining Methods
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