TOMRA Sorting’s XRT equipment recovers world’s largest diamond in over 100 years

Friday, Nov 27, 2015

Lucara Diamond Corp. recently used TOMRA XRT technology to recover a magnificent 1,111ct type IIa diamond at their Karowe Mine in Botswana.

The second largest gem quality diamond in history and the largest ever to be recovered through a modern processing facility was detected by a TOMRA LDR (large diamond recovery) machine utilising X-ray transmission sensors, which was commissioned at Karowe earlier this year.

Lucara Chief Operating Officer Paul Day explained that they selected TOMRA XRT equipment following extensive testing that demonstrated the technology as having the highest diamond recovery efficiency and lowest concentrate yield compared to its competitors. He added that TOMRA’s technology can detect all types of diamonds with the same efficiency and has a remarkably small footprint in terms of power and water consumption.

TOMRA Sorting Solutions Head Dr Volker Rehrmann commented that it was an honour for TOMRA to be part of setting new benchmarks in the diamond mining industry. Lucara’s confidence in TOMRA’s innovative sensor-based sorting technology was rewarded with this outstanding recovery.

Six TOMRA XRT sorters are in operation at the Karowe Diamond Mine since May 2015 replacing conventional Dense Media Separation (DMS) technology in the -60+8mm size range. Key advantages of the XRT technology include a compact footprint, low operating costs, high recovery rates and extremely low concentrate yields with no need to further process the sorter’s concentrate before final hand sorting. Each TOMRA sorter can treat up to 150 tons per hour at over 8,000 hours per year.

Launched at the beginning of 2014, TOMRA’s new range of diamond recovery solutions outperforms traditional technologies, providing the highest diamond recovery rates at the lowest yields, resulting in lower running costs for recovery plants.

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