TOMRA Sorting Solutions‘ TOMRA XRT (X-ray transmission) technology was instrumental in the recent recovery of a magnificent 1.111 ct type IIa diamond at diamond miner and explorer Lucara Diamond Corp’s Karowe mine in Botswana.
The diamond, which is the second largest gem quality diamond in history and the largest ever to be recovered through a modern processing facility was recovered by a TOMRA LDR (large diamond recovery) machine, which was commissioned at Karowe earlier this year.
“We selected TOMRA XRT following an extensive suite of test work which demonstrated TOMRA XRT technology as a superior technological solution having the highest efficiency of diamond recovery and lowest concentrate yield compared to their competitors. TOMRA’s technology detects all types of diamonds with the same efficiency and has a remarkably small footprint in terms of power and water consumption,” says Lucara Diamond Corp COO Paul Day.
Meanwhile, TOMRA Sorting Solutions head Dr Volker Rehrmann says it is an honor to be part of setting new benchmarks in the diamond mining industry. “We are very proud that Lucara showed confidence in our innovative sensor-based sorting technology which was rewarded with this outstanding recovery.”
Six TOMRA XRT sorters are in operation at the Karowe diamond mine and have been since May 2015. The sorters are being used to replace conventional dense media separation (DMS) technology in the -60+8mm size range.
Each sorter can treat up to 150 tph at over 8 000 hours per year.
Advantages of the XRT technology include its compact footprint, low operating costs, high recovery rates and extremely low concentrate yields. There is no need to further process the sorter’s concentrate before final hand sorting.
At the beginning of 2014 TOMRA launched a new range of diamond recovery solutions which out-performs traditional technologies, providing the highest diamond recovery rates at the lowest yields. This allows the overall complexity of recovery plants to be reduced, resulting in lower running costs.
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