Tag Archives: Browns Range

Orexplore furthers critical mineral core scanning push with Green Critical Minerals, Northern Minerals agreements

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Mineral scanning technology company, Orexplore Technologies Limited, has made inroads into the critical minerals industry after signing two scanning agreements with companies from that sector and progressing an R&D project in collaboration with Uppsala University.

Green Critical Minerals has extended its engagement for a further 2,500 m of core scanning, in addition to 300 m already scanned in 2023 via Orexplore’s laboratory service. This order brings the total value of the engagement to approximately A$226,000 ($149,589) and encompasses scanning of graphite-bearing drill core and the delivery of ore-sorting evaluation, grade proxy modelling and emerging graphitic flake analysis solutions using the dataset captured by the company’s GeoCore X10® hardware, Orexplore says.

Green Critical Minerals is developing the McIntosh graphite project in Western Australia, which, it says, currently has the third largest graphite resource in Australia with 1.1 Mt of contained graphite.

Northern Minerals, meanwhile, has extended its engagement for an additional 900 m of core scanning, following the 420 m already scanned to date. This order brings the total value of the engagement to approximately A$130,000 and encompasses scanning of rare earth-bearing drill core and crushed samples. The project focuses on delivering two Orexplore solutions – ore-sorting evaluation and a proof of concept for operational grade control, the company said.

Northern Minerals is developing the Browns Range heavy rare earth project in Western Australia, which is currently the subject of a definitive feasibility study.

On top of these two agreements, Orexplore said its research and development on critical minerals accelerates with a project it is carrying out in collaboration with Uppsala University in Sweden having recently progressed to scanning samples from Talga Group Limited’s (ASX: TLG) Swedish resources. It has also received a development grant of A$77,000 for advancing a project on lithium scanning technologies with a Swedish lithium producer, which is supported by Sweden’s Vinnova innovation agency.

Steinert XRT ore sorter testing shows promise at Northern Minerals rare earth project

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Northern Minerals Ltd has progressed its ore sorting project enhancement initiative with the commissioning and testing of the Steinert sorter system, and is now producing ore sorted material and converting this to a 30% total rare earth oxide (TREO) concentrate in its’ Browns Range beneficiation plant in Western Australia.

Northern Minerals’ CEO, Mark Tory, said: “The construction, commissioning and testing of the ore sorter circuit marks another milestone in the development of the Browns Range project.

“The positive bulk sample tests confirm the effectiveness of the ore sorting circuit on the Wolverine ore to significantly increase the head grade to the mill which is expected to result in higher production rates and lower operating costs for a full-scale operation at Browns Range.

“It’s also pleasing to see the initial ore sorting tests the Banshee ore showing promise which, if shown to be effective in future tests, has potential to significantly increase the Browns Range mineral resource estimate.”

He added: “Being able to test and operate the ore sorting circuit in conjunction with the pilot beneficiation plant is providing extremely valuable data that you just can’t get from small bench-scale tests and this will feed into our feasibility study for a potential commercial scale heavy rare earth operation at Browns Range.”

The ore sorter system was constructed during 2020 and 2021 and commissioned in June 2021. The sorter that was installed is a 2-m wide Steinert sorter that uses X-ray Transmission (XRT) and laser detectors to identify rare earth mineralisation.

The sorter has been run over two test campaigns, which included 41 test runs processing 5,300 t of ore from the run of mine stockpiles largely coming from Wolverine ore, and five test runs on Banshee ore that was bulk sampled from a surface costean that provided 285 t of Banshee ore.

The tests have confirmed that simultaneous sorting of two size fractions is possible on the sorter, allowing a single machine to sort both sortable size fractions (10 mm-25 mm and 25 mm-75 mm), Northern Minerals says. The sortable fraction (>10 mm material) of Wolverine ore can be successfully sorted (90% TREO recovery in 50% of the mass) and, when combined with non-sortable fines, achieves a 45% grade increase to the mill and over 95% TREO recovery when feeding a 0.9% TREO ore.

The sorter system is now being run to produce feed for the beneficiation plant and 4,479 t of Wolverine ore have been processed through the ore sorter circuit to the end of August. Processing of the Wolverine ore sorted material in the beneficiation plant has resulted in better recoveries in the magnetic separation plant and flotation plant compared with feeding unsorted ore, the company says. A bulk sample of 50 t of 30% TREO rare earth concentrate has being produced for test work by facilities identified with likely future capability and capacity to process the heavy rare earth xenotime concentrate produced at Browns Range.

Bulks sample tests have highlighted some key factors to consider for ore sorting that cannot be determined at bench scale using vendor equipment in laboratory settings. Understanding the impact of these factors is critical to including an ore sorting circuit in a full-scale processing facility.

Initial sorting tests of the Banshee ore have shown that the highly oxidised surface material contains a large fines fraction and that the grade of the sortable fraction (ie >10 mm) can be doubled recovering more than 60% of the TREO in 25% of the mass. An additional bulk sample is being extracted from deeper in the costean and three diamond drill holes are being drilled for further test work.

The bulk ore sorting test work is a key input for the full-scale beneficiation plant feasibility study currently underway, which will also leverage off the substantial technical, operational and economic data from the R&D test work at the Browns Range Pilot Plant since 2018, the company says.

Northern Minerals rare earth pilot plant keeps up thyssenkrupp REC deliveries

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Northern Minerals’ Browns Range rare earth pilot plant in Western Australia has continued to churn out more product, with the company set to soon make a shipment of more than 40,000 kg to offtake partner thyssenkrupp Materials Trading GmbH.

The Browns Range pilot plant has now surpassed a new production milestone of 210,000 kg of rare earth carbonate (REC), Northern Minerals said.

A shipment of 40,406 kg of REC that contains 1,835 kg of dysprosium oxide and 233 kg of terbium oxide is ready at Browns Range for delivery to thyssenkrupp, bringing total production of REC from the pilot plant to 211,109 kg.

The REC produced to date contains a total 103,731 kg of rare earth oxide, which, in turn, contains 9,751 kg of dysprosium oxide and 1,245 kg of terbium oxide: critical elements in the permanent magnet motors used in E-mobility powertrain applications.

Northern Minerals CEO, Mark Tory, said: “Despite the operational and supply chain challenges in the past 12 months, the global trend toward electrification of transport continues to accelerate as a result of regulatory changes and bold decisions by car manufacturers in transition to fully-electric fleets.

“Browns Range is still the most strategically placed heavy rare earths operation in the western world, and we continue to apply our significant R&D learnings to successfully produce batches of REC for our European offtake partner thyssenkrupp from our pilot plant in the Kimberley region of Western Australia.”

Northern Minerals started producing rare earth carbonate through the Browns Range pilot plant in October 2018 as part of a three-year pilot assessment of economic and temporary technical feasibility of a larger-scale development at Browns Range.

The company expects to commission a Steinert sensor-based ore sorter at Browns Range in the June quarter as part of its latest R&D work at the pilot plant.

Northern Minerals lays the groundwork for Steinert XRT ore sorter installation

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Northern Minerals is set to commission a Steinert sensor-based ore sorter for use at its Browns Range rare earth pilot plant, in northern Western Australia, after gaining the relevant regulatory approvals for installation of the machine.

The ore sorting equipment concentrates ore prior to the beneficiation circuit by selecting ore and rejecting waste based on X-ray Transmission. This has the potential to double the feed grade and reduce production costs, according to the company.

Both the Western Australian Office of the Environmental Protection Agency and the Department of Water and Environmental Regulation have now cleared the installation and commissioning, with construction commenced on the structural and mechanical equipment (pictured). Commissioning is scheduled for mid-2021.

The total capital investment for the procurement, installation and commissioning of the ore sorter is budgeted at A$5.9 million ($4.3 million), Northern Minerals said.

Previous trials of ore sorting technology at Browns Range, announced in October 2018, identified the potential to double the mill feed grade. This would lead to an increased production rate of heavy rare earth carbonate and a potential lowering of overall operating costs.

Once the ore sorting system is commissioned, Northern Minerals plans to run additional test work at pilot plant scale on all ore types to establish baseline data on feed grade improvements, it said. This work will also help evaluate material flow-through benefits of ore sorting on overall processing efficiencies, feeding into any future commercial, large-scale project feasibility studies at Browns Range.

Northern Minerals says it is also evaluating the economics of further downstream processing options for Browns Range ore.

To date, Browns Range has produced a mixed heavy rare earth carbonate for small-scale export to offtake partners. The options being assessed would take a further step along the supply chain to produce separated heavy rare earth oxides.

The company announced in August 2019 it had commenced a scoping study with US-based K-Technologies Inc to investigate a separation technology on intermediate mixed rare earths materials produced at Browns Range. K-Tech’s technology is focused on continuous ion exchange, continuous ion-chromatography and related advanced separation methodologies.

The study continues to progress well, with positive test results being achieved at K-Tech’s facilities in Florida albeit slower than planned because of constraints associated with COVID-19, Northern Minerals said. However, the company expects to see separated dysprosium and terbium oxides from the study before the end of this year.

Separately to collaborating with K-Tech, Northern Minerals is pursuing studies into traditional solvent extraction to produce oxides from the mixed heavy rare earth material produced at Browns Range.

Northern Minerals CEO, Mark Tory, said: “With approvals in place for the ore sorter and installation now under way, we will be in a strong position to thoroughly evaluate the flow-through benefits of that technology at a pilot plant scale.

“The results will provide a valuable input into future feasibility studies to assess the commercial viability of a large-scale heavy rare earths mining and processing operation at Browns Range.

“In addition to our investment in ore sorting to improve the mill feed grade, we are also committed to assessing opportunities to further unlock value at Browns Range through downstream processing to oxide products, which opens up a wider field of offtake and future project financing opportunities.”

Northern Minerals started producing rare earth carbonate through the Browns Range pilot plant in October 2018 as part of a three-year pilot assessment of economic and temporarily technical feasibility of a larger scale development at Browns Range.

Northern Minerals backs XRT ore sorting pilot plant plan with Steinert order

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Northern Minerals has capped off its ore sorting project enhancement initiatives at the Browns Range rare earths project, in northern Western Australia, with the selection of a Steinert ore sorter for use at its pilot plant.

The selected machine is in stock in Perth and a deposit has been paid in order to secure it and avoid any lead time lags or delays, the company said.

Nexus Bonum, which previously completed the feasibility study for the x-ray transmission ore sorter system at the pilot plant, has been engaged to undertake the front-end engineering and design work required for the inclusion of the sorter into the pilot plant beneficiation circuit.

The company said: “As previously announced, the findings from initial test work and studies indicate that the inclusion of ore sorting at Browns Range has the potential to double the mill feed grade potentially leading to an increased production rate of heavy rare earth carbonate and a potential lowering of operating costs.”

The company is currently working with stakeholders and regulators on obtaining the approvals required for the installation of the ore sorter at Browns Range and is aiming to have the system installed and commissioned by mid-2020, subject to receiving these approvals in a timely manner.

Northern Minerals’ Managing Director and CEO, George Bauk, said: “Following the recent capital raising, we have moved quickly to progress this critical piece of equipment that has the potential to be a game changer for the project.

“Higher grades going into the plant would result in higher production rates and lower operating costs, a double win in terms of proving the economics of the Browns Range project.”

Northern Minerals commenced production of heavy rare earth carbonate at the Browns Range pilot plant back in October. This followed plant commissioning in June.

The project is designed to assist the company in evaluating the economic and technical feasibility of mining at Browns Range and will provide the opportunity to gain production experience and surety of supply for its offtake partner. This could see the company become the first significant producer of dysprosium outside of China.

Rare earths Western Australia pilot project starts up

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Northern Minerals has become the first heavy rare earth producer outside of China after starting up a pilot plant at its Browns Range project in the East Kimberley region of Western Australia.

The official opening of the plant, attended by various Western Australia ministers, comes a year to the day since construction commenced.

Browns Range’s main products are dysprosium and terbium. The former is an “essential component in the success of the electric vehicle evolution”, according to Northern Minerals.

“As the only dysprosium producer outside China, Northern Minerals is well placed to become a significant, stable supplier of this important element,” the company said.

Both heavy rare earths are also used in wind turbines, industrial robots, air conditioning and many other new technologies in development.

Managing Director and CEO George Baulk said the company had been helped along the way by the federal government’s R&D Tax Incentive Scheme for “stimulating the emergence of new industries”.

The three-year pilot plant project will be used to assess the economic and technical feasibility of a full-scale development at Browns Range.

A total 172,080 tonnes of mineralised material at 1.19% total rare earth oxides (TREO), containing 2,047 t TREO, will be mined and stockpiled ready to be fed into the pilot plant. The plant will process 60,000 tonnes per year of this material through the beneficiation plant, and 3,200 t/y of xenotime concentrate at 20% TREO through the hydrometallurgical process.

The final product will contain 4.9 t of dysprosium in 590 t TREO within a mixed rare earth carbonate.

This is all a warm up for the full scale project, which will have a beneficiation plant able to process 585,000 t/y of ore and produce a high-grade mineral concentrate to feed into the hydrometallurgical plant. This process consists of a crushing and grinding circuit and combination of wet high gradient magnetic separation and flotation.

The overall beneficiation circuit delivers recoveries of 91% dysprosium and 87% TREO at a 20% TREO mineral concentrate grade.

The hydromet plant should produce 279 t of dysprosium contained with 3,127 t of TREO, in 6,000 t of mixed rare earth carbonate per year.