Alrosa has commissioned the Udachny underground diamond mine in the Sakha Republic, eastern Russia, at the site of a surface mining operation that began in 1971. Upon reaching its design capacity of 4 million metric tons per year (mt/y) of ore in 2019, the underground mine will become the largest underground diamond mine in Russia and one of the largest worldwide.

Open-pit mining at the Udachnaya pipe is expected to be fully completed in 2015. Until then, the underground and open-pit mines will operate in parallel. (Photo courtesy of Alrosa)