In a press release dated 1st February 2018, ALROSA, the world’s leading diamond mining company has announced the recovery in January 2018 of two significantly large gem-quality natural octahedral-shaped rough diamonds, weighing 97.92 carats and 85.62 carats, from its Yubileynaya (Jubilee) Diamond Mine, the world’s biggest diamond mine, situated in the Sakha (Yakutia) Republic of Russia, owned and operated by the Aikhal mining and processing division of the Company. The diamond was actually recovered at the Processing Plant No. 14, situated 8 km from the Yubileynaya kimberlite pipe, where the kimberlite produced at the Yubileynaya open-pit diamond mine are processed for the recovery of diamonds. Today a major portion of diamond output of the Aikhal Mining Division comes from the largest open-pit mine of Yubileynaya (Jubilee) Diamond Mine.
The Jubilee Diamond Mine has been in production since 1986. The Yubileynaya kimberlite pipe was estimated to contain more than 153 million carats (Mct) of recoverable diamonds, including 51Mct of probable underground reserves as at 2013. Jubilee diamond mine produced 10.4Mt of ore in 2012. The open pit mine is presently operating at a depth of 320m, but is expected to eventually reach 720m. The Yubileynaya diamond pipe is renowned for the recovery of large diamonds and is traditionally ALROSA’s leader in the recovery of large diamonds.
The 97.92-carat rough diamond recovered at the mine is an Octahedral natural crystal, transparent with a yellowish-hue, with the interior of the diamond clearly visible. There are small inclusions of sulfide and Olivine in the periphery of the diamond. The dimensions of the diamond are 26 х 17 х 21 mm.
The 85.62-carat rough diamond is also a natural isometric octahedron crystal of almost equal dimensions of 27.89 х 27.20 х 27.14 mm, transparent with a yellowish hue and with small disseminated inclusions of sulfide and olivine.
Commenting on the new discoveries, Evgeny Agureev, Director of the USO ALROSA and Member of the Executive Committee, said, “We are happy to announce new findings. It is true that large stones over 50 carats are very rare. Such diamonds are traditionally sold at auctions where they are in good demand. ALROSA manufactures the rarest and clearest diamonds at its cutting division DIAMONDS ALROSA and sells them on its own.”