Mirny Diamond Mine

Is an open pitdiamond mine located in Mirny, Eastern Siberia, Russia. The mine is 525 meters deep (4th in the world) and has a diameter of 1,200 m, and is the second largest excavated hole in the world, after Bingham Canyon Mine. The airspace above the mine is closed for helicopters because of a few incidents in which they were sucked in by the downward air flow

Info here

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