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In vertical shaft sinking what is a collar

This question belongs to Mining Engineering Mine Development And Mining Methods
Mine Development and Mining Methods
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In vertical shaft sinking, what is a "collar"?

Answer & Solution
Correct Answer: Option B
Collar is the surface opening of a vertical shaft.The correct answer is: Opening of the shaft at surfaceIt requires strong reinforcement to prevent collapse and erosion.Usually supported by concrete or steel structures.
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