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What is a raise borer used for

This question belongs to Mining Engineering Mine Development And Mining Methods
Mine Development and Mining Methods
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What is a raise borer used for?

Answer & Solution
Correct Answer: Option C
Raise borer drills vertical or inclined shafts between levels.The correct answer is: Creating vertical holesIt drills a pilot hole, then enlarges from below upward, creating smooth-walled shafts.Used in ventilation raises and ore passes.
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