What is the purpose of a "collar" in shaft sinking?
A. Explosive loading zone
B. Opening for drilling
C. Initial reinforced shaft opening
D. Shaft ventilation device
Answer: Option C
Solution (By Examveda Team)
Collar is the reinforced surface opening of a shaft.The correct answer is: Initial reinforced shaft openingIt stabilizes the ground near the surface and provides a solid base.Critical for long-term shaft safety.This Question Belongs to Mining Engineering >> Mine Development And Mining Methods
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