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How do miners know when a stone quarry is fully tapped out?

Asked by elbanditoroso (33765points) February 8th, 2021

I was using Google Maps – street view – to look at some quarries:

example 1

You can see how the road spirals down the the bottom.

It seems like they’re leaving a huge amount of rock on the sides of the quarry. Why? How do they decide when to stop digging?

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