ALROSA found a 241.21-carat rough diamond at its Nyurbinsky mine in Yakutia, one of the largest recovered in Russia.
The diamond measures 38.64 millimeters x 27.34 millimeters x 25.46 millimeters and is translucent with a grey hue. The crystal contains graphite and sulphide inclusions and is “4 black clivage/makeable 2 color,” ALROSA said.
The diamond is the third largest to originate from the miner’s Nyurba Mining and Processing Division, one of ALROSA’s youngest units. The business is home to the Nyurbinsky and Botuobinsky open-pit mines and two alluvial placers with the same name. Its share in ALROSA’s production was 20 percent in 2015. The Nyurbinsky open-pit mine was put into operation in 2001 and had reserves of 36.9 million carats as of January 1, 2015, according to an evaluation under the Joint Ore Reserves Committee code.
ALROSA last month reported the discovery of a 207.29-carat rough diamond at the Zarnitsa pipe, also in Yakutia. The gem was the largest found since open-pit mining started at the mine in 1999.