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The Udachny diamond mine, located in the Yakutia region of Russia, ranks as the world’s second largest diamond mine by reserve size. Estimated diamond reserves at the mine exceeded 152Mct as of January 2013. The mine is owned by Alrosa and operated by its Udachny mining and processing division. The mine extracts ore from the Udachnaya Kimberlite pipe, whose JORC-compliant diamond reserves as of July 2013 were estimated at more than 120Mct, including 7.3Mct of proven reserve from the ore stockpile. Udachny is bigger than Jubilee in terms of JORC reserve estimates. The Udachnaya pipe discovered in 1955 is the largest diamond deposit in Russia. Udachny, which is one of the deepest open pit mines in the world, produced 10Mct of diamonds a year until 2011. The open pit operation halted during the middle of 2015, while the underground operation is expected to continue for more than 30 years - Mining Technology.

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