✅ The Mir Mine - one of the largest excavated holes in the world ✅ Also called Mirny Mine, the Mir Mines is an open pit diamond mine located in Mirny, Sakha Republic, in the Siberian region of eastern Russia. The mine is more than 525 meters (1,722 ft) deep (4th in the world), has a diameter of 1,200 m (3,900 ft). It is owned by ALROSA Diamonds. ✅ The mine first opened in 1957 and was closed in 2004, before being recommissioned in 2009. It was expected to remain operational for 50 more years, bu