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What is the main purpose of installing a collar during shaft...

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

Answer & Solution
Correct Answer: Option C
Shaft collar is a reinforced structure at the surface opening.The correct answer is: Provide stable top for equipmentSupports hoisting structures and prevents surface collapse.Often constructed with concrete.
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