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What is the purpose of a collar in shaft sinking

This question belongs to Mining Engineering Mine Development And Mining Methods
Mine Development and Mining Methods
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What is the purpose of a "collar" in shaft sinking?

Answer & Solution
Correct Answer: Option C
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.
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