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What does face advance refer to in tunneling

This question belongs to Mining Engineering Mine Development And Mining Methods
Mine Development and Mining Methods
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What does "face advance" refer to in tunneling?

Answer & Solution
Correct Answer: Option C
Face advance is the measure of how far the tunnel is extended after each blast or round.The correct answer is: Distance the tunnel front progressesIt's an indicator of development rate and efficiency.Typically measured in meters/day.
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