ALROSA Recovers 241-Carat Diamond at Nyubrinskaya
June 16, 16
(IDEX Online News) – World-leading diamond miner by volume, ALROSA, has announced the recovery of a 241.21-carat rough diamond from its Nyubrinskaya pipe. The stone is one of the largest ever recovered in the Russian Federation and the third largest among those found at Nyurba Mining and Processing Division.
The crystal measures 38.64 mm by 27.34 mm by 25.46 mm, and is translucent with a grey hue. Traces of dissolution – etching channels and caverns – were observed on the surface. The intermediate and peripheral zones contain large cracks, one of which is ferruginized. The crystal contains graphite and sulphide inclusions. The diamond is 4 Black Clivage/Makeable 2 colour.
The Nyurbinsky open-pit mine was put into operation in 2001 and identified reserves as of January 1, 2015 was 36.9 million carats.