Then there's the high-altitude Chuquicamata mine in northern Chile…

Then there's the high-altitude Chuquicamata mine in northern Chile, 9,300 feet above sea level. This mine is owned by Chile's Codelco and is the world's largest open-pit copper mine, spanning almost three miles from end to end and two miles wide.

— from Who Is Flying (Self, Nature & Nurture)

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