How do miners know when a mine is tapped out ? Or how they know where to mine in the first place?
In: Earth Science
You drill holes, and pull back the cores and sample and assay them. Then you draw a map with what you learned and drill more holes, map its etc. once you have it mapped sufficiently for a cost benefit to work you start digging and actually mining.
You want to know the mine is running out before you’ve done the blasting and mucking and hauling and milling if the grade is too poor to pay for the effort.
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