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What is the main function of a raise bore machine

This question belongs to Mining Engineering Mine Development And Mining Methods
Mine Development and Mining Methods
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What is the main function of a raise bore machine?

Answer & Solution
Correct Answer: Option C
Raise boring is a technique to drill vertical or inclined shafts.The correct answer is: Excavate vertical openingsIt drills a pilot hole, then enlarges it from bottom to top.Used for ventilation shafts and ore passes.
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