The Mirny Diamond Mine is one of the largest diamond mines in the world, located in Siberia, Russia. It is an open-pit mine, measuring about 1,200 meters in diameter and 525 meters deep. The mine was discovered in 1955 and has been a significant source of diamonds for the Russian diamond industry. The mine is known for its unique shape and size, making it a notable landmark. It was primarily operated by the Alrosa company, which is one of the largest diamond producers globally. Due to its depth, the mine is not currently in operation, but it remains an important part of diamond mining history.