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Inside The Resolution Copper Mine, 1.3 Miles Underground

This mine's shaft is a 6,943 foot concrete barrel, 30 feet in diameter bored into the mountain of Arizona that took six years to dig.

Mar 15, 2016

There are deeper mines in North America than the Resolution mine but none with a single shaft this long. It is a 6,943 foot concrete barrel, 30 feet in diameter bored into the mountain of Arizona and took six years to dig. Bloomberg's Matt Philips journeys toward the center of the earth to check out this engineering marvel.

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