Which mining method involves retreating the face and allowing the roof to collapse behind?
A. Block caving
B. Longwall mining
C. Cut and fill
D. Room and pillar
Answer: Option B
Solution (By Examveda Team)
Longwall mining is common in coal mining with high productivity.The correct answer is: Longwall miningPowered supports advance with the face while the roof collapses in the gob area.This method is highly mechanized.This Question Belongs to Mining Engineering >> Mine Development And Mining Methods
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