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Which structure prevents collapse of a shaft during sinking

This question belongs to Mining Engineering Mine Development And Mining Methods
Mine Development and Mining Methods
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Which structure prevents collapse of a shaft during sinking?

Answer & Solution
Correct Answer: Option B
Shaft liner is a permanent internal support in the shaft.The correct answer is: Shaft linerMade from concrete, steel, or wood.Protects against water, rockfalls, and collapse.
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