Bourevestnik, Inc., subsidiary company of ALROSA, supplied and commissioned a set of X-ray luminescence sorters at the new recovery plant of the historic Cullinan mine in South Africa. The Cullinan Mine is owned 74% by Petra Diamonds Limited and is renowned as the source of very rare blue diamonds and large, high quality gem diamonds, including Type II stones characterized by low nitrogen content (their volume not exceeding 1−2% of the world production).
The decision to implement Bourevestnik’s sorters was taken by Petra Diamonds after assessment and comparison of diamond recovery technologies available in the market relative to the unique characteristics of the Cullinan ore. This process confirmed the high recovery efficiency of all types of diamonds by the Bourevestnik sorters, including low-luminescent Type II diamonds characterized by low luminescence level under X-ray exposure.
As part of this project, Bourevestnik has supplied 27 sorters, specifically upgraded as per Petra Diamonds’ requirements, for primary recovery, reconcentration and final concentrate treatment of diamond bearing ore, with a sizing range of -75 mm +1 mm. Processing of Run-Of-Mine material with a size fraction of -75 mm +6 mm is done directly via X-ray sorters without the application of Dense Media Separation. The planned throughput capacity of the new recovery plant at Cullinan is 6 million tonnes per annum. In addition to supplies of equipment, Bourevestnik, Inc. has performed commissioning, technical personnel training and arranged consignment stock of spare parts.
Petra Diamonds is a leading independent diamond mining group and an increasingly important supplier of rough diamonds to the international market. The company is developing the Finsch, Cullinan, Koffiefontein and Kimberley Ekapa Mining JV diamond operations in South Africa and Williamson in Tanzania. Petra Diamonds will be further increasing annual production above the 4 million carats produced in 2017 and the company’s main aim is to optimise recoveries from its asset base in order to maximize their efficiency and profitability. For further information, visit www.petradiamonds.com.
Bourevestnik, Inc. is one of the world’s biggest designers and manufacturers of X-ray sorters for diamond recovery and is a subsidiary of “ALROSA” (PJSC).