Optimised use of data

Excellent results at Mothae Diamonds in Lesotho

The Mothae mine, located in the Maluti Mountains of Lesotho is known to produce large, high-value diamonds which command the second highest dollar per carat for kimberlite diamonds worldwide. The company relies on TOMRA’s XRT sorting technology and digital solutions – the TOMRA Insight platform and TOMRA ACT user interface – to recover large unbroken diamonds from the mine with high sorting efficiency and high throughput, while benefiting from lower operational costs.

 

Global diamond producer Lucapa Diamonds owns 70 % of Mothae Diamonds, an open-pit mine located in the diamond-rich Maluti Mountains of Lesotho, which started commercial operation in 2019 following the commissioning of its kimberlite processing plant. The mine is known to produce large, high-quality diamonds, and has had significant gem-quality recoveries including a 215 carat D-colour Type IIa, a 204 carat Type IIa, and rare pink, blue and yellow fancy-colored
diamonds.

 

When planning the recovery plant, Mothae turned to TOMRA Mining for a solution: “We wanted to recover large diamonds at the highest sorting efficiency with the highest throughput, and TOMRA met Mothae’s requirements with its modern and innovative technology,” says Macobone Semelane, Recovery Superintendent.

 

The recovery plant operates two TOMRA COM Tertiary XRT 1200 sorters: one for fines from 10 mm to 20 mm, and the other for coarse materials from 20 mm to 45 mm. The ore extracted from the mine is treated through primary crushing, scrubbing and screening, then transferred to the recovery area: “That’s where the TOMRA sorters separate diamonds from the ore,” explains Kothalo Matoli, Recovery Mechanician. “TOMRA sorters are the best of the best. With them, we are able to recover large diamonds prior to secondary and tertiary crushing, hugely reducing the risk of breakages, and our throughput is high, with 98 % efficiency guaranteed.”

 

TOMRA Insight with TOMRA ACT: unlocking the power of data

The two TOMRA XRT sorters at Mothae are connected to the TOMRA Insight cloud-based data platform that turns the machines into connected devices that generate valuable data and puts operators in control of the sorting process. They also feature the TOMRA ACT user interface, which facilitates the optimization of the workflow and improves productivity.

 

Macobone Semelane explains: “As a relatively small and low-grade mine, we are always investigating the latest technologies. With our sorters operating 24 hours a day, seven days a week, we were looking to maintain and upgrade our sorters to the latest compatible software and hardware. We wanted a portal that is user-friendly so our operators can easily interact with the sorters. TOMRA ACT now provides clear visualization of events and alarms, and captures the images of the belt occupancy. It also shows the ejection activity.”

 

“TOMRA Insight has changed the way we are running our production because we can monitor our sorters remotely and we can access reports from both machines in one interface,” says Kothalo Matoli. “All the alarms and events are logged on the sorter in real time, enabling me to troubleshoot very fast. My troubleshooting skill has improved a lot.”

 

TOMRA Insight also stores and backs up all the data generated by the sorters so that the operator can analyze the complete history of each machine. “Digital data is crucial. TOMRA Insight has exceeded my expectations because I can access data whenever I want, wherever I am. I have at my fingertips the learnings about my sorters, their operation and maintenance. We can see the belt occupancy and our ejection rate, and understand if a machine is over-ejecting due to foreign objects in the material, for example. The utilization of the sorters has improved, enabling us to process more tons and recover more carats.”

 

“I can monitor the sorters’ operational and health status from the office or offsite. TOMRA Insight captures and compiles all the data in one interface, generating reports and data analyses, improving data management and analytics for better decision-making. With TOMRA Insight, I see advanced sorting solutions in the future and automated recovery plants,” adds Macobone Semelane.

 

www.tomra.com
www.tomra.com/mining

x

Related articles:

Issue 12/2021 XRT technology

A game-changer at Letšeng Diamond Mine in Lesotho

T?OMRA’S XRT sensor-based sorting technology unlocks significant value for Gem Diamonds at its Letšeng Diamond Mine. It delivered an effective solution for coarse fractions in historical tailings...

more
Issue 07-08/2019 Record-breaking

TOMRA XRT Technology recovers 1758 carat diamond

One of the largest diamonds in recorded history, an unbroken 1758 carat stone, was recovered by TOMRA XRT sensor technology commissioned by Lucara Diamond Corp at its Karowe Mine in Botswana. The...

more
Issue 09/2021 Yield guaranteed

XRT Final Recovery solution that guarantees final pure diamond concentrate

T?OMRA Sorting Mining has launched the new TOMRA COM XRT 300 /FR Final Recovery sorter, which delivers concentration factors up to 1 million with limited stages and is the only solution on the market...

more
Issue 12/2019 Exceptionell quality

TOMRA’s ore sorting technology delivers improvement at Stornoway Diamonds Renard mine

S?tornoway Diamonds is one of the leading Canadian diamond exploration and producing companies. It owns and operates the Renard Mine, in commercial production operation since 2017. It is the first...

more
Issue 01-02/2016

World’s largest Diamond in over 100 years

TOMRA Sorting Mining congratulates Lucara Diamond Corp. (Lucara) upon the recent recovery of a magnificent 1111?ct type IIa diamond using TOMRA XRT (X-ray transmission) technology at their Karowe Mine...

more