What defines a "shaft collar" in mine development?
A. Entry-level training
B. Shaft entrance reinforcement
C. Ore chute part
D. Emergency ladder
Answer: Option B
Solution (By Examveda Team)
Shaft collar is the reinforced concrete or steel structure at shaft top.The correct answer is: Shaft entrance reinforcementProvides stability and structure for surface installations.Protects against soil collapse.This Question Belongs to Mining Engineering >> Mine Development And Mining Methods
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