November 23rd, 2010 by Youzhny
World’s Biggest Diamond Mine is located at Mirna, Eastern Siberia, Russia. The mine is 525 meters (1,722 ft) deep and has a diameter of 1,200 m (3,900 ft).
The mine is so big and giat that 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. To give an idea how big it is here is is a fine illustration.