Tag Archives: x-ray fluorescence

New Gold to collaborate with MineSense in underground ore sorting move

MineSense is gearing up for a move underground with the help of New Gold and its New Afton gold-copper mine in British Columbia, Canada.

The Vancouver-based technology company has already established and proven its ShovelSense technology for the open-pit mining sector, with its X-ray Fluorescence (XRF) sensor-based system now operating on shovels, wheel loaders and excavators on a commercial basis across six operating mines. This includes large installations at Teck’s Highland Valley and Copper Mountain’s copper operations in BC, as well as one ShovelSense unit at the Antamina copper operation in Peru.

Designed for operation in extreme environments and retrofits on any existing mobile equipment, ShovelSense units come equipped with a human machine interface and proprietary algorithms that measure and report ore grade/characteristics. They can also connect directly to fleet management or other existing control software systems, enabling mine operators to reconcile geological block models with actual ore grade data.

Having finetuned the system for above-ground operations, the company is now embarking on its underground move, according to MineSense President and CEO, Jeff More.

A trial of the underground ShovelSense system at New Gold’s New Afton mine is first up to complete product development. The company will be installing a unit on a Cat R1600G LHD for this step. This will be followed closely by installation at a “large entity” in Chile – with More anticipating start up in the September or December quarter.

The development agreement with New Gold at the BC-based mine is looking to trial and finetune the system for underground operations, with More confident the ShovelSense system will stand up to the test.

“The core technology – all of the algorithms, software, hardware – is the same as ShovelSense for open-pit mining,” More said. “It is the ‘application package’ – looking at how we can attach the unit to the machine and protect it in an underground environment – that is what we have to test out. The design for this is already complete; it’s just a matter of trialling it.”

New Afton represents a good test for the system.

New Afton is Canada’s only operating block cave mine, with the New Afton deposit part of a larger copper-gold porphyry district in the region. The operation regularly mines 15,000-16,000 t/d of ore and waste, with the majority of this currently going to the mill.

The company has already pursued “ore segregation” projects to boost the grade of material being fed through to the processing side, but the move into the higher-grade C-Zone in 2023-2029 will place an even greater emphasis on ore/waste boundaries and milled tonnes at the operation.

At the same time, the ShovelSense deployment at New Afton will represent the first time MineSense has sent a unit into a mine that has so much payable gold, with most operations the company has worked on being primarily base metal-oriented.

In 2020, New Afton produced 64,000 oz of the yellow metal, along with 32,659 t of the red metal.

“This will be the first time we’re touching gold at this level; we have other mines that have payable gold but not at that level,” More explained.

In New Afton’s case, sampling and historical data has proven that the orebody’s copper and gold ratios tend to be consistent and unchanging over the long term. With this knowledge, New Afton has used technology in the past to determine the copper value and make ore/waste production decisions. ShovelSense allows New Afton to move the ore/waste production decision to the drawpoint, according to MineSense. This reduces mixing and blending during the crushing and conveying circuit which can homogenise the material to the point where it is not worth segregating.

Trialling new technology such as this is nothing new for New Afton.

The operation already uses automated loading through Sandvik’s AutoMine solution, is employing electrification with the use of Sandvik and MacLean Engineering battery-powered mobile equipment, and, in the process plant, has Gekko Systems’ highest volume InLine Pressure Jig IPJ3500 to improve gravity concentration.

More says the ShovelSense unit could be in the Cat LHD bucket at New Afton in August, with the machine then going through an above-ground trial ahead of the underground transition at the end of September.

“By early Q4, we should have completed the pilot,” he said.

LKAB to trial AI-backed XRF drill core logging with help of Minalyze and Sentian

LKAB, Minalyze AB and Sentian say they have joined forces in a consortium to develop the latest technology for scanning drill core.

In March 2020, LKAB started a test with the Minalyzer CS drill core scanner where the goal was to improve the workflow for core logging – ie how the results of exploration drilling are analysed. The test led to a permanent installation in Kiruna (Sweden) and expansion to Malmberget where data from the Minalyzer CS is used to help geological logging of the drill core.

The consortium of LKAB, Minalyze and Sentian are now set to take the use of data to the next level when boreholes in LKAB’s deposits are to be investigated. The new artificial intelligence application being developed by the trio will make the analysis much faster, with the time to evaluate a drill core reduced from weeks to minutes, with increased accuracy.

This could see Minalyze’s X-ray Fluorescence-backed CS scanner analyse LKAB drill core while leveraging Sentain’s industrial artificial intelligence solutions to make real-time decisions relating to drilling and exploration activities.

The technology development driven by the consortium will be a world first, changing the entire industry, the companies say.

Jan-Anders Perdahl, Specialist at LKAB’s Exploration Department, said: “With the collaboration, the core logging takes a big step through machine learning and artificial intelligence. The geologist can, at an early stage, place greater focus on the parts of the core that show chemical or other changes. Opportunities are opened up to gain increased knowledge about ore formation processes and alterations in a completely different way than before. One can also get indications that you are close to mineralisation and where it may be located, and thereby streamline exploration.”

The technological leap will give LKAB’s staff increased competence, increased quality in and efficiency of the work, as well as reduced need for other analysis methods, according to the companies.

Annelie Lundström, CEO of Minalyze AB, said: “We are at an interesting time when the hardware to extract consistently high-resolution data from drill cores is available and we can now take the next step and generate value from data together with our customers. In this collaboration, we will develop algorithms that can map rock layers in so-called lithological logs with very high confidence. This can only be done by combining expertise from all three parties.

“The results from our collaboration will forever change how drill core logging takes place everywhere and will result in a more efficient, non-subjective and consistent process.”

Martin Rugfelt, Sentian CEO, added: “We see great power in the application of modern artificial intelligence to data from the mining industry and there is major potential in further combining our machine learning technology with Minalyze’s unique capabilities in data collection and analysis.”

New Metso Outotec Courier on-stream analyser could reduce gold losses

Metso Outotec is launching its next-generation Courier® 6G SL on-stream analyser for direct measurement of gold, platinum and other valuable metal concentrations from ore feed, concentrate, and tailings streams.

The new analyser enables accurate real-time elemental analysis measurement critical for establishing efficient process control to improve process stability and maximise recovery, it says.

It builds on the Outotec Courier 6X SL analyser with a more powerful X-ray tube and measurement channels optimised for direct on-line measurement of gold and other elements from calcium to uranium, the company says. This makes it particularly suitable for applications where gold is recovered with other metals such as silver or copper.

The system can measure up to 24 individual process streams – each with an individually adjustable measurement time – to ensure optimal measurement accuracy and sampling frequency in even the most complex polymetallic flotation circuits. It can also provide direct measurement of gold concentrations down to 0.2 g/t

The new next-generation on-stream analyser combines Wavelength Dispersive X-ray Fluorescence and Energy Dispersive X-ray Fluorescence technologies with a high-power X-ray tube for unparalleled measurement performance, Metso Outotec claims. It also features an automatic internal reference measurement for guaranteed stability under changing environmental conditions.

Lauri Veki, Metallurgist at Agnico Eagle’s Kittilä operation in Finland, said: “Agnico Eagle Kittilä has used the new on-stream analyser for flotation control and optimisation since October 2019. Measurement information provided by the Courier 6G SL has enabled more efficient control of the pre-flotation circuit and helped to reduce gold losses.”

Bruker brings benchtop EDXRF into lab automation space

Among several new innovations Bruker has launched is a benchtop X-ray elemental analyser that, the company says, can speed up elemental analysis in mining applications and be integrated into automated laboratory environments.

Originally planned for a launch at the now delayed Analytica 2020, this week, Bruker has proceeded with an online launch of these new products.

The company says its next-generation benchtop energy dispersive X-ray Fluorescence (EDXRF) spectrometer, S2 PUMA™ Series 2, is equipped with HighSense™ technology for increases in throughput by about a factor of three times.

Bruker’s software, SPECTRA.ELEMENTS™, comes with enhanced features and faster algorithms, leading to circa-40% shorter evaluation times, the company said.

The S2 PUMA Series 2 supports elemental analysis applications from cement, steel, mining and petrochemical, to food analysis and pharma quality control, according to the company.

The benchtop EDXRF instrument is used for solid and liquid samples, prepared or bulk, for the elemental analysis from carbon to americium (C – Am), according to Bruker. “Detectable elemental concentrations in the samples can range from parts per million up to 100%,” it said.

Bruker continued: “The HighSense technology of the S2 PUMA Series 2 combines high-power (50 W), long-life-time X-ray tube with closely coupled optics and the HighSense detectors. The HighSense (for Na to Am) and HighSense LE detector (C-Am) are next generation silicon drift detectors with high count rates, superb energy resolution, and Peltier-cooling for shortest measurement times, excellent data quality and low operation costs

“The unique sample handling options of the S2 PUMA Series 2 make it the perfect fit for many applications in industry and research, where precise and accurate results must be delivered fast on an easy-to-operate instrument.”

Depending on sample type and desired throughput, the versions Single, XY Autochanger, Carousel, Automation, and Mapping-Stage are available, the company said.

And, according to Bruker, the S2 PUMA Series 2 Automation is the only benchtop EDXRF spectrometer ready for full integration into automated laboratory environments.

“The Mapping-Stage enables automated multi-spot analysis collected on small and large samples (up to 152 mm in diameter),” Bruker said.

De Beers diamond XRF technology optimises sorting at emerald mine

De Beers Group Technology has adapted one of its X-ray fluorescence (XRF) diamond sorting range of machines to create “a secure and efficient sorting solution for emeralds”, it says.

According to De Beers Group Technology head, Gordon Taylor, the company’s sorting technologies have been applied to a range of minerals apart from diamonds, and these include gemstones like rubies to lower value commodities like manganese and coal.

“We are always on the look-out for new applications for our sorting equipment, which also employ X-ray luminescence, X-ray transmission, laser, magnetics and ultra-violet technologies,” Taylor said.

“So, we were excited by the opportunity to collaborate with Magnum Mining and Exploration on their Gravelotte emerald project in Limpopo province.”

In its trial mining and processing phase, Gravelotte has been gathering data to confirm the historic grades previously recovered at the project. In operation for much of the 20th century, total recorded production from this area was estimated at nearly 113 Mct. It was reportedly the world’s largest emerald mine of its type in the 1960s, employing over 400 sorters, De Beers said.

General Manager of Operations at Gravelotte, Wessel Marais, said the traditional manual method of sorting carried an associated security risk and led to less than optimal recoveries.

“Various mechanical sorting options are available on the market today,” Marais said, “and Magnum approached De Beers Group Technology to determine whether their diamond sorting technology could be adapted to emerald sorting.”

He says testing of samples provided by Magnum came out with successful results.

“This led to Magnum leasing an XRF machine from De Beers Group Technology for the duration of our trial mining, and the results to date have been very encouraging,” he says. “With the machines now deployed in the operational environment, research and development work is continuing in conjunction with De Beers Group Technology to refine the process.”

Taylor noted that constructive collaboration with customers is often an important element in extending the application of De Beers Group Technology’s equipment.

“On this project, we were able to conduct some fundamental investigation on the properties of emeralds to guide us in developing the most effective solution,” he said.

The De Beers Group Technology emerald sorting machine can make a potentially significant contribution to the success of the Gravelotte operation, according to De Beers, with its high recoveries combined with excellent processing security. The project aims to reach a target of around 3 Mct/y as its initial production rate.

Before the run-of-mine material reaches the De Beers Group Technology XRF machine, it is crushed to -30 mm and put through a trommel screen for cleaning and further size reduction. After material containing emeralds is ejected from the material stream by the sorter, it is further sorted by hand and graded.

“De Beers Group Technology is constantly pushing the boundaries where our equipment can be applied and has had significant successes in non-diamond commodities. Whether removing the value product or the waste from the process stream, our sorting technologies can be the game-changer in the viability of many projects,” Taylor concluded.

XRF ore sorting shows potential at Yukon zinc project

X-ray fluorescence (XRF) ore sorting technology has found another fan after Fireweed Zinc reported positive results from preconcentration test work at its Macmillan Pass zinc project in the Yukon of Canada.

Samples from Macmillan Pass’ Boundary Zone, a discrete bulk-tonnage, exploration target 15 km northwest of the Jason zinc-lead-silver deposit, were put through XRF, X-ray transmission, electromagnetic and dense media separation sorting tests by Canada’s Sacré-Davey Engineering at the University of British Columbia, with XRF showing the most promising results, Fireweed said.

The principal results of the 436 rock samples tested in the XRF trials included the potential to upgrade the feed grade from 2.5% Zn to 5% Zn and a rejection rate of 70-50%, with zinc recoveries ranging from 80-85%.

Fireweed pointed out that the analysis in the study assumed that 25% of the feed had fines (-12 mm) which cannot be processed in the ore sorter. As a result of this, the fines would bypass the sorter and combine with the ore sorter product, with the final grade of 5% Zn achieved after combining the ore sorter product with the fines assumed to have a grade of 2.5% Zn.

XRF sorting is currently used at over 50 operations across the world, including Hecla Mining’s San Sebastian mine, in Mexico, and Anglo American’s Mogalakwena mine, in South Africa, according to Fireweed.

Typically, it uses an XRF sensor to distinguish and measure surface metal abundances on rock pieces moving on an enclosed conveyor belt unit. The XRF readings for each individual rock are then analysed by high speed software to distinguish and flag rocks with metal values above and below a set threshold.

At the end of the conveyor belt, focused high pressure air jets or mechanical levers then separate the designated higher-grade rock pieces for processing and reject low grade and waste pieces. The amenability to ore sorting depends on the material characteristics of a deposit.

Fireweed said: “The Boundary Zone samples responded positively to XRF testing because zinc values on the surfaces of individual rock pieces correlate closely with the overall zinc assays of those rocks.”

Fireweed Zinc CEO, Brandon Macdonald, said the ore sorting results imply there is potential to improve the economics of the Macmillan Pass project.

He continued: “These results suggest that we may be able to reject 50% to 70% of low-grade and waste rock at low cost near a potential open-pit operation at Boundary with less than 15% loss of zinc mineralisation before material is transported to a central processing plant at Tom.”

Macdonald said the company has now moved the drill to Boundary to both confirm and step out from historic holes, as well as obtain a 2 t sample to confirm these ore sorting results may be obtained on a larger scale.

“If the larger test is successful, we can then incorporate the benefits of an XRF ore sorting system at Boundary into a revised preliminary economic assessment economic study along with upgraded information from recent drilling at Tom, Jason and End Zones.”

A 2018 preliminary economic assessment at Macmillan Pass showed that a 4,900 t/d operation could be constructed for an initial capital C$404 million ($305.9 million) using starter-pits on the Tom West and Jason Main zones.

This plan would result in average yearly contained-metal production of 85,000 t of zinc, 48,000 t of lead and 2 Moz of silver over an 18-year life, with an after-tax net present value (8% discount) of C$448 million generated.