HomeDiamonds & GemstonesAlrosa recovers 241 carat diamond, one of the largest in the Russian...

Alrosa recovers 241 carat diamond, one of the largest in the Russian Federation

Alrosa diamondIt is one of the largest rough diamonds recovered in the Russian Federation and the third largest among those found at Nyurba Mining and Processing Division.

The crystal (see right) measures 38.64 mm x 27.34 mm x 25.46 mm, and is translucent with a grey hue. Traces of dissolution – etching channels and caverns – are 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.

Nyurbinsky open-pit mine was put into operation in 2001. Identified reserves of the diamond pipe under JORC as of 1 January 1 amounted to 36.9 million carats.

Nyurba Mining and Processing Division is one of Alrosa’s youngest enterprises. It operates at the Nakyn ore field and develops Nyurbinsky and Botuobinsky open-pit mines, and two same-name alluvial placers. Its share in Alrosa Group’s production totaled 20% in 2015.