Tag Archives: mineral processing

SRK’s stepwise approach to pre-concentration analysis

Bulk handling, Comminution of minerals, Environmental, Mineral processing, Mining services, Sustainable mining, , , , , , ,

Having outlined a new vendor-agnostic, lab-based “pre concentration screening test” for mining in part one of this three-part series, SRK is back for part two, discussing the wider pre-concentration evaluation process that this testing fits into

“With any pre-concentration analysis, we need to, first, understand the heterogeneity of the deposit; simply put, if you don’t have heterogeneity, you don’t have the ability to separate the good stuff from the bad stuff and carry out pre-concentration,” Bob McCarthy, Principal Consultant, SRK Consulting (Canada) Inc, says.

With this baseline in mind, SRK Consulting has devised a pathway for companies with drill core at their disposal to analyse whether pre-concentration is a viable option for their flowsheet.

Made up of five steps, this staged approach is deliberately designed to allow companies to pause at the end of each phase to re-evaluate if there is a strong enough case to continue investing the time and finances required.

The heterogeneity analysis is first up, which, under SRK’s evaluation, includes two different approaches based off drill hole analysis: Heterogeneity and Scale and Composite-Sample Relationship Analysis.

“Heterogeneity and Scale involves a process of looking up and down the bore hole at different aggregation distances from every sample and interrogating the sample grade – or net smelter return – against the aggregations above and below that individual sample,” he explains. “We then increase the size of the aggregation to see how that relationship changes.”

Such analysis enables SRK experts to derive the heterogeneity measures typically dubbed ‘waste in ore’ (mineralisation below the cutoff grade within an above cutoff grade zone) or ‘ore in waste’ (mineralisation above the cutoff grade within a waste or marginally below cutoff grade zone). Using a cutoff grade derived from industry benchmarking, the consultants assess the aggregation distance, as resolved in the vertical direction, with the “selective mining unit” (SMU), which typically relates to equipment sizing for mining.

“Heterogeneity and Scale involves a process of looking up and down the bore hole at different aggregation distances from every sample and interrogating the sample grade – or net smelter return – against the aggregations above and below that individual sample,” Bob McCarthy says

“The pitfall some companies go down is picking your SMU to match an equipment size and production rate typically aligned to a corporate or strategic objective,” McCarthy says. “This could mean generating a 12-14-year mine life for a gold operation, or some other investor-led metric that doesn’t necessarily respect the deposit’s heterogeneity.”

The second approach – Composite-Sample Relationship Analysis – allows consultants to further quantitatively assess those waste in ore/ore in waste heterogeneity measures.

“Those parameters have multiple uses after being determined,” McCarthy says. “For example, they help guide in the sample selection – you can even visualise them in 3D with something like Leapfrog. You can also see contiguous lengths of above or below cutoff grade material in ore zones or marginal waste zones, representing what an ore sorter may see. These would be targeted for testing.”

Responding to industry calls, SRK now offers a step between this fundamental heterogeneity analysis and the test work it can conduct at Base Metallurgical Labs’ Kamloops facility in British Columbia, with what McCarthy calls “size the prize” economics. It provides insight into possible pre-concentration strategy outcomes and, just as important, justification to continue to the next step of lab test work.

This process – carried out by SRK on several projects in the past – is designed to allow the mining company and consultant to test pre-concentration strategies from an economic perspective, assessing if an operation should be removing waste from ore or looking to recover above cut-off grade material from “marginal waste”.

McCarthy added: “It is about answering these questions: is it best to remove waste from mill feed, and to what maximum grade of feed, or to extract mineralised material from marginal, below cut-off grade material that increases the mineral reserve? And, of course, do the expected results of this process look promising?”

Gold is a good example here as the economic case study for pre-concentration often only stacks up when a “cap” is applied to the grade of ore subjected to pre-concentration. In other words, the highest-grade material should not be targeted. Even high-efficiency pre-concentration methods incur some metal loss, and any amount of “loss” that occurs in a gold project is difficult to make-up within a conventional flowsheet.

Example of drill core intervals showing waste in ore percentages of up to 80%

The third step in this five-step process is the lab test work McCarthy’s colleague, Adrian Dance (Principal Metallurgist at SRK Consulting), previously outlined in detail in the first article in this three-part series.

The “pre-concentration screening test” leveraging X-ray Transmission based sensor technology can not only indicate pre-concentration amenability, but also provide key inputs into the pre-concentration strategy selection and evaluation, Dance says. He says the testing offers an assessment of pre-concentration potential, as well as an estimate of material bypass and metal upgrade from samples as small as half cores.

Used in conjunction with crushing and screening, this testing rapidly – and cost effectively – assesses the potential for pre-concentration, which can then be applied to scoping or pre-feasibility studies, according to SRK and Base Metallurgical Labs.

Which is where steps four and five of the SRK evaluation – mine planning and mine economics – come in.

“With the heterogeneity measures assigning the distribution of waste in ore, ore in ore, and ore in marginal material in mining block models, the test results reflecting these conditions can be populated into those same models for mine planning,” McCarthy explains.

Typical mine planning steps of pit/stope optimisation, mine design and scheduling can proceed on the assumption of one or more pre concentration strategies, with different versions of mine schedules, reflecting different pre concentration strategies, evaluated.

This type of analysis typically works for a project in pre-feasibility study stage, where engineers can go into the existing block model, bringing the results from the heterogeneity and lab tests into the mine optimisation, design and scheduling process that takes place.

“The challenge is that the scheduling needs to assume a certain strategy – maybe you have determined what that strategy is close enough with the ‘size the prize’, but there are always a few elements you may want to tweak,” McCarthy says. “This could be the mass pull, or waste rejection targets, for instance.”

As a result, sensitivity analyses – mostly numerical tweaks – are embedded in the process.

When not dealing with a pre-feasibility-level project, the SRK team typically rely on an existing schedule that has been run during a scoping study or preliminary economic assessment. This model is modified and tested with different schedule scenarios and pre-concentration strategies based on the heterogeneity measures (step 1) integrated with the lab test results (step 3).

Out of the mine planning step comes a schedule that would go onto the next step: mine economics modelling.

“The model is configured to take in the heterogeneity measures, recovery curves, etc to change the amount of metal reporting to revenue and so forth,” McCarthy says. “Once I get schedules – based on the upgraded block models or it may be a pre-existing schedule – I would then put them into an economic model that has all the levers to pull for different pre-concentration strategies.”

Such a stepwise approach is indicative of where the mining industry is at the moment with vendor-agnostic pre-concentration analysis, enabling companies to get comfortable with the data and assessments as their understanding of their deposit’s heterogeneity grows.

There are potential refinements and fine-tuning opportunities too.

For example, if SRK was gifted with drill core or assay data that was more granular than the 1-2 m intervals typically taken at the exploration stage, it could indicate with greater certainty how particle sorting – typically analysing grades at intervals around a few centimetres – could benefit the deposit in question.

Also, if mine modelling software had matured to the point where block models could be tailored specifically to these waste-in-ore and ore-in-waste characteristics, SRK could segregate the areas in question, instead of applying the type of dilution factors they currently have in place to account for the grade-based realities. This would more clearly communicate the deposit’s heterogeneity to all stakeholders.

Yet, McCarthy and Dance know this will come in time, and are happy to work within the current confines to continue the industry’s education process and identify where the pre-concentration opportunities are

Further discussion on this and what SRK’s pre concentration analysis evaluation – with that embedded pre-concentration screening test – means within the broader mining industry context will follow in the final article in this three-part series later this year

Metso cuts the ribbon on Mexico screening media factory

Comminution of minerals, Mineral processing, Mining equipment, Mining services, , , , , ,

Metso has celebrated the inauguration of its screening media factory in Irapuato, Mexico, a new facility that, it says, will significantly increase its supply and delivery capabilities for mining and aggregates customers in North and Central America.

The screening media center employs 46 people and is located on a 9,000-plus sq.m lot. The new screening media factory uses advanced and sustainable manufacturing practices, and the installed solar panels will cover approximately 50% of the needed electricity, according to the company.

Alfredo Monreal, Vice President, Sales and Service, Mexico and Central America, Metso, said: “We are very pleased to officially inaugurate our new screening media factory in Irapuato. This milestone is yet another indication of our deep commitment to customer success. The Irapuato region is an important centre of excellence for high-quality products for our mining and aggregates customers.”

Metso’s screening installed base in the Americas has grown significantly: last year alone Metso delivered a total of 250 new screening machines to mining and aggregates customers.

Jouni Mähönen, Vice President, Screening business line, Metso, said: “Our target is to continuously develop our operations close to customers to further improve our service capability. The investment of a new factory in Mexico aligns with our strategy and improves our lead times, and it offers scalability in production volumes in a very important region.”

Today, Metso has approximately 730 employees working in production, sales and field service in Mexico.

In the same industrial area in Irapuato, Metso also has a new rubber and Poly-Met media factory. Construction of a new polymer filter plate factory will be finalised during 2024 and the factory will be operational in early 2025.

Metso’s screen offering consists of banana screens, horizontal screens, inclined screens, mobile screens, portable screens and ultrafine screens. It says it offers versatile screening media systems for a wide range of screening applications with solutions that range from rubber and polyurethane to classic wire.

GR Engineering executes EPC contract for K92’s Kainantu gold mine process plant build

Comminution of minerals, Mining equipment, Mining services, Precious metals, , , , , ,

GR Engineering Services says it has executed engineering, procurement and construction (EPC) contracts with K92 Mining Ltd, a subsidiary of TSX-listed K92 Mining Inc, for a 1.2 Mtpa process plant at the Kainantu gold mine in Papua New Guinea.

As announced on July 25, 2023, GR Engineering had previously received a Letter of Intent from K92 Mining Ltd. The contract’s sum is $81 million. Site mobilisation is expected to occur in January 2024.

Tony Patrizi, Managing Director of GR Engineering, said: “GR Engineering has a long track record of successful project delivery in the mineral processing sector. We see this contract award as a strong endorsement by K92 Mining Inc of GR Engineering’s proven process design record and EPC delivery capability.”

K92 Mining owns and operates Kainantu, a producing gold mine that has existing infrastructure at site. The EPC works are being performed as part of K92 Mining’s Stage 3 Expansion plans. It has successfully executed multiple expansions at the Kainantu gold mine, after restarting operations at the site in 2016.

SRK Consulting, Base Metallurgical Labs tackling pre-concentration amenability

Base metals, Mineral processing, Mining services, Mining software, Sustainable mining, , , , , , , , ,

In this first of a three-part series of articles on pre-concentration in the mining space, SRK’s Adrian Dance outlines a new vendor-agnostic, lab-based testing process that could have huge ramifications for a sector in need of guidance and strategy.

Stay tuned for part two in the series, which will see SRK’s Bob McCarthy explain how results of such testing can be used by the mining community.

The need to expand the values or lives of assets while reducing both energy and water use is leading to a flood of new enquiries landing on the doorsteps of the pre-concentration and ore sorting company fraternity.

Anybody that takes a passing interest in the junior mining sector has seen the TOMRAs and Steinerts referenced in numerous TSX-V, ASX and AIM releases, with early-stage test work often detailing results from particle sorting trials.

On the bulk sorting side of the business, more sensor-based solutions are emerging to cope with the need to build or expand copper assets in the most sustainable ways possible. Some progressive companies are including such innovations in initial flowsheet plans.

The bottleneck in the current environment is testing, according to Adrian Dance, Principal Metallurgist at SRK Consulting, with many of the vendors simply overrun with requests to test material or provide modular pilot plants that can be re-located after samples are processed.

At the same time as demand is outpacing supply, there is an argument that a standardised, vendor-agnostic test should be devised to screen for ore sorting or pre-concentration amenability before any vendors are even engaged.

SRK is one company arguing for this.

“At the moment, the manufacturers are driving the action, dictating what the sample has to look like for something that resembles a pilot plant trial,” Dance told IM. “Like any pilot plant run, these trials often give you an excellent result on that specific sample, but the question is: is that sample truly representative of the orebody? Or, is it representative of what a sorter would actually see in operation?”

An increase in available data and transfer of said data across the mine site is going some way to disproving the idea of mass homogeneity at many bulk mining operations – at copper porphyries, for example.

Dance believes this same thought process should be applied to pre-concentration.

This is where SRK Vancouver and Base Metallurgical Labs, both in British Columbia Canada, are looking to provide a “pre-concentration screening test” using X-ray Transmission (XRT) based sensor technology that can not only indicate pre-concentration amenability, but also provides key inputs into the pre-concentration strategy selection and evaluation.

The two companies are offering an assessment of pre-concentration potential, as well as an estimate of material bypass and metal upgrade from samples as small as half cores.

The XRT sensor lab unit

Used in conjunction with crushing and screening, this testing rapidly – and cost effectively – assesses the potential for pre-concentration, which can then be applied to scoping or prefeasibility studies, according to the companies.

“The testing has two parts to it,” Dance explains. “It was originally designed to see what the grade distribution of fines is after crushing and to see how that grade distribution varies depending on the amount of crushing energy applied to the material.

“The second part is looking to see if the material is amenable to pre-concentration when it is coarse and dry – ie conveyable.”

According to the companies, the XRT-based test can provide this within 24 hours of a sample arriving at the lab.

All of this helps characterise deposits (or low-grade stockpiles) using small samples, cutting down sample mass requirements, and potentially running multiple scenarios to obtain what Dance refers to as the “optimal sort”.

The two companies are not looking to replicate what may be done at one of the sorting vendors’ testing facilities. Instead, they are looking at whether the material wants to respond to this type of particle sorting exercise in the first place and at what size fractions pre-concentration would make sense.

Should the indications prove positive, the information on what appears to be the optimal sort can be passed onto the vendors for more accurate follow-on testing of a bulk sample.

“In this way, we are qualifying the opportunity ahead of the vendors getting samples,” Dance said. “The vendors also have knowledge about how a sample has responded to amenability testing in the first place and what other tests were conducted concurrently.

“We will be providing complementary testing that will, ultimately, benefit the project in question.”

Dance says the aim is to create an industry standard test for pre-concentration that can be replicated by commercial laboratories all over the globe and is carried out routinely with hardness and crushing and grinding testing.

“One of the samples we have already tested was being assessed for rock hardness and we were able to offer them pre-concentration amenability results at the same time,” he said. “We’re not trying to provide the ultimate or ‘perfect’ test; it just needs to be a standard test that can be benchmarked and easily replicated across the industry.

“The value is in the data shared. People want to know how their sample compares with other operations, but this will only come with a large volume of testing.”

XRT scan results of particles
XRT scan results of particles

While XRT is first up, Dance says the company could soon add an X-ray Fluorescence option to the unit.

And, further out, he is confident this type of testing will open the door to more sensors coming into the mining sector outside of the ones already on offer.

“When we show the electronics industry that we have a viable market by dictating the terms of how we want to sort material through knowledge of such testing, the sensors will come,” he said.

“I’m not saying everyone should implement pre-concentration; far from it, as I expect a minority of the tests will show strong amenability. What I am saying is that everyone should test for it.

“By providing a no licence fee test that has no bias towards any vendor, we are allowing mining companies to scope that out.”

The venture is also part of Dance’s own ambitions to educate the mining sector on its waste-generating ways, he says.

“In the grinding space there is so much material that is recycled throughout the plant inefficiently,” he said. “We must question why we are putting things back in the mill to ultimately take it to tailings.

“There is simply no way we can carry on pursuing the economies of scale argument to reduce our energy consumption and water use. We need to embrace new technology in the right way – not running towards it but walking with purpose and data-backed decisions.”

Weba Chute Systems helps Northern Cape mine with transfer point efficiency project

Comminution of minerals, Mineral processing, Mining equipment, Mining services, , , , ,

Weba Chute Systems is working with a mine in the Northern Cape of South Africa to improve material flow, with the operation having ordered two custom engineered chutes from the specialist transfer point company, which are expected to improve efficiency at the transfer points.

According to Weba Chute Systems’ Regional Manager for the Northern Cape, Arnold Archer, the contracts are for an apron feeder discharge chute and a jaw crusher feed chute. Archer says the company had previously supplied the mine with a SAG mill feed chute, and had collaborated successfully to improve performance within that application.

With run-of-mine material at the mine including large lump sizes of 800 mm to 1.2 m, there is a high risk of blockages if the chutes are not purpose designed, he argues. The high velocity of the material can also cause considerable damage to chutes as well as create excessive dust.

To inform Weba Chute Systems’ designs, the company’s team uses technical questionnaires to help gather information from the customer on a range of variables. This includes factors like lump size indicators, belt speeds, feed rates, moisture content and material velocity. The application-specific data paves the way for a design that optimises flow and equipment life, the company says.

“On the apron feeder discharge chute, for instance, we designed a swing door that will absorb most of the impact of big lumps moving at high velocities,” Archer says. “This also helps to protect the wear plates on the jaw crusher.”

The aim of the design will be to assist the mine reduce the incidences of chute blockages, spillage and excess dust – making the process more streamlined and less labour intensive. He points out that the mine aims to achieve higher uptime through optimal chute performance. The reduction in spillage and dust also contributes to the mine’s high standards of health and safety.

“Our philosophy is that every transfer point on a mine has its own specific challenges, so the chute for each transfer point will be different to the next one,” Archer says. “We work with customers to understand the detail of their material flow through these points, so that our design takes all the key factors into account.”

He notes that most mines will have the necessary data gathering systems in place to inform the correct chute design – as they have tachometers on their conveyors, blocked chute detectors and feed monitors. The issue is that this information is not always systematically considered during chute design.

“We are proud of the chutes we design and manufacture, and stay close to our customers to ensure that the chutes’ performance is up to expectation,” Archer explains. “Our staff is passionate about getting everything right, and being there to follow up where necessary.”

Among the improvements made on the SAG mill feed chute at the mine, for example, were changes to the liner composition and pattern. Rather than removing all the liner segments to reach the middle row, the pattern change now allows this row to be removed without loosening all the other liners, he says.

Weba Chute Systems can also install its own chutes, but provides supervision and assistance where the mine arranges the installation itself, Archer concludes.

Henry Pratt Company launches news knife gate valve for slurry, abrasive material applications

Mining equipment, Water management, , , , ,

Henry Pratt Company has unveiled the Pratt® P77 Perimeter Seated Bi-Directional Knife Gate Valve, engineered to handle tough slurries and abrasive materials in industries such as mining.

The P77 meets the rigorous MSS SP-81 standards and offers a range of features and benefits that make it an excellent valve for industrial applications, according to the company.

Dale Speggen, VP of Specialty Valves for Mueller, said: “The Pratt P77 Perimeter Seated Bi-Directional Knife Gate Valve is an industry game-changer. With its sealing capabilities and its ability to reduce stress on the packing chamber, the P77 ensures reliable and efficient operation. We are proud to offer this valve, which sets a new standard for performance and reliability.”

The P77 Knife Gate Valve has superb sealing capabilities, ensuring a drip-tight shutoff, and preventing the buildup of solids, regardless of line pressure. The valve is designed to eliminate any confusion regarding the direction of isolation, providing clarity and ease of use in demanding industrial environments, it says.

Thevalve is designed with multiple rows of packing to reduce stress on the packing chamber, enhancing the longevity and reliability of the valve, while the integrated PTFE gate guide reduces wear on the packing, preventing blockages and flow disruptions with its non-stick properties.

Featuring an EPDM perimeter cartridge seat, the P77 Knife Gate Valve resists chemicals and high temperatures while preventing leakage and protecting downstream equipment. By reducing leak paths and extending the life of the packing, this valve minimises maintenance requirements and ensures smooth operation, Henry Pratt Company claims.

The heavy-duty cast stainless steel body is resistant to deflection from line loads and internal pressure, further enhancing the valve’s performance and longevity.

Metso to deliver two Vertimill 4500 grinding mills to Canadian iron ore producer

Comminution of minerals, Mineral processing, Mining equipment, Mining services, Steel and iron ore, , , , , , , , , ,

A Canadian iron ore producer has awarded Metso an order for two powerful Vertimill® 4500 grinding mills to be delivered in the September quarter of 2024. The value of the order, which exceeds €10 million ($10.6 million), has been booked in Minerals segment’s 2023 September-quarter orders received.

Graham Davey, Director, Stirred Mills at Metso, said: “We are very pleased to collaborate on projects that support decarbonisation of the steel industry through production of high-grade and high-purity iron ore with sustainable processes. The Vertimill stirred grinding mill technology is globally recognised as a leading solution for energy-efficient grinding. Compared to traditional technology, operators can typically save up to 30-35% of the electrical energy and grinding media consumption. A small footprint and easy installation are also big advantages.”

Vertimill technology is an example of Metso’s Planet Positive offering. It is capable of handling feed sizes of up to 6 mm and grinding to product sizes of 30 microns or less. Vertimills are available in standard mill sizes ranging from 11 kW to 3,352 kW.

Since the introduction of the technology in the 1990s, Metso says it has sold over 540 Vertimill units to nearly all types of minerals.

Metso says it is the only manufacturer worldwide that can offer several stirred mill technologies (Vertimill, HIGmill™ and SMD), enabling it to support customers with the most suitable and efficient mill for their application.

CDE opens new Australian headquarters in Queensland

Mineral processing, Mining equipment, Mining services, , , , , ,

CDE has announcd the official opening of its new Australian headquarters in Queensland as it commits additional resources to the local market.

Based in Stapylton, near Brisbane and the Gold Coast, the new 2,900 sq.m site, complete with managed stores, is part of the company’s wider growth plans and follows the announcement and commissioning of several new large-scale projects in the Australasian market.

CDE says it has steadily grown its local team to over 20, across business development, project management, installation, commissioning and aftersales support teams with plans for future recruitment underway.

“We have designed and engineered over 60 projects across Australia, New Zealand and Papua New Guinea, including turnkey solutions for Repurpose It – described as “Australia’s most sophisticated resource recovery plant” – and Walker Quarries – one of the newest and most advanced quarry wash plants in New South Wales,” the company said.

In 2022, the company was also awarded the contract to design, supply and install a state-of-the-art washing solution for Rino Recycling for the treatment of construction & demolition (C&D) and commercial & industrial waste materials at their Pinkenba site in Brisbane.

On the mining side, in 2019, Centrex Metals partnered with CDE Meta to deliver a state-of-the-art wet processing plant at the company’s Ardmore site, in Queensland, to produce phosphate concentrate.

Australasian General Manager, Daniel Webber, says: “Our purpose is to create our best world a tonne at a time, and to do this we need to be supporting our customers to realise their purpose and vision. Support means being there when they need us, and that means having CDE boots on the ground.

“We have great confidence in the potential of this market and we’re fully committed to supporting new and existing customers, whose trust in our expertise is key to making this very investment possible.”

To minimise plant downtime, the investment in CDE’s new Australian headquarters includes the development of fully stocked and managed stores to house high-wear, consumable and critical plant components.

Peter Neely, CDE CustomCare Regional Manager for Australasia, says: “For the first time in the local market, we’re able to offer readily-available parts. Responsive on-the-ground support and locally available parts with short lead times means we are better equipped to strengthen our direct relationships with customers, ensuring their plants continue to run material at optimum efficiency to support a fast return on investment.”

The company’s pre-emptive and preventative approach to plant maintenance sees thousands of replacement parts readily available for immediate dispatch to customers throughout Australasia.

Webber adds: “Our approach to aftercare is designed to ensure our customers get the maximum performance from their CDE equipment. Central to this is having a direct relationship with customers and continuing to invest resources in the markets where they are based. Our investment in Australia is but one part of wider plans to invest in and resource our regional teams and offices to provide the best level of care possible to protect our customers’ investments.”

“By growing our regional team we are closer to our clients during the sales process, resulting in better solutions being developed; we are closer during project delivery, leading to safer and more efficient work sites; and, most importantly, we are closer once our customers plants are operational, enabling us help maintain uptime through scheduled maintenance activities and prompt professional breakdown support.”

Metso reflects on mechanical flotation technology evolution

Comminution of minerals, Mineral processing, Mining equipment, Mining services, Sustainable mining, , , , , , , ,

Metso is celebrating 50 years of mechnical flotation this month, reflecting on the pivotal role flotation technology has played in the company’s history over the last five decades.

Evolving from humble beginnings at Outokumpu, and then further developed by Outotec, Metso has shaped the course of mechanical flotation and propelled the industry forward, it says.

The OK cell was taken into commercial use in 1973 with a capacity of 16 cu.m. At that time in flotation history, tanks were square-shaped when viewed from the top. As demand for even larger tanks escalated, a 38-cu.m version was introduced to optimise processes and achieve higher recoveries, and, ultimately, to enhance profitability.

During development of the larger flotation cells, the team noticed square-shaped tanks posed challenges in terms of load-bearing capacity at the corners. As a result, the entire industry shifted to round-shaped tanks. Thus, the TankCell® was born in 1995.

“TankCell is a great example of our history in flotation,” Antti Rinne, VP, Flotation at Metso, said. “Everybody who talks of TankCell flotation cells is speaking of our technology. We remain the original and leading provider of TankCell technology.”

Today, Metso TankCell boasts the world’s best flotation performance and offers a wide variety of cell sizes, currently ranging from 5 to 630 cu.m, the company says. This enables compact and cost-effective plant designs, even for high-tonnage operations. Fewer large units result in significant savings in construction costs, piping, cables, instrumentation and auxiliary equipment.

Rinne said: “Now, the biggest cell is almost 20 times larger than the original 38 cu.m. And, when we introduced the FloatForce® mixing mechanism in the TankCell design, it gave customers up to 30% savings in energy consumption and significantly better recoveries.”

Today’s flotation circuits are often designed and optimised with Metso’s HSC simulation tool, thus enabling optimisation of total flotation cell volume and other key flotation parameters, the company says.

Metso Concorde Cell, entering the market as recently as 2021, stands out as a significant milestone in flotation, according to Metso. The Concorde Cell is capable of recovering the unachievable fine and ultra-fine particles, increasing profitability while reducing operating costs, energy consumption and water usage.

This patented technology – the first of its kind – is tailored for finely disseminated and complex orebodies that were once considered inaccessible. For optimal results, it is best when used in conjunction with TankCell technology, Metso claims. Both are part of Metso’s Planet Positive offering and ensure unmatched metallurgical performance, it added.

“Combining the well-proven TankCell technology with Concorde Cells is a low-risk and high-benefit approach,” Rinne says. “The cell produces very high shear and extremely fine bubbles, which increases recovery in particles under 20 microns. Despite being the newest technology in Metso’s flotation portfolio, it has already been deployed at several operations globally.”

Since flotation is a continuous process, maintaining high availability and efficiency is crucial. Metso’s developments in flotation cell technology enable upgrading and retrofitting of older flotation equipment for enhanced performance, the company says. These advancements not only extend the lifespan of existing equipment, but also align operations with environmental and safety standards, ensuring long-term viability and compliance.

For more information on this flotation technology evolution, click here

Montepuez Ruby Mining to triple processing capacity at Mozambique operation

Diamond mining, Mine operation news, Mineral processing, Mining equipment, Mining services, , , , ,

Gemfields’ 75%-owned Montepuez Ruby Mining Limitada (MRM) has entered into a legally binding contract with Consulmet Limited to construct an additional processing plant at MRM’s ruby mine in Mozambique.

The addition of the second plant will triple MRM’s processing capacity from the existing 200 t/h to 600 t/h, allowing MRM to process its sizeable stockpile, bring to market additional size and colour variations of rubies and to assess and expand into additional mining areas, Gemfields says.

The contract is a lump-sum turnkey contract based on industry standard International Federation of Consulting Engineers terms, with MRM’s payment obligations agreed in South African rands and equating to approximately $70 million (at recent foreign exchange rates and excluding VAT and government levies).

Subject to specified milestones, it is estimated 30% of this cost will fall in 2023 and 60% in 2024, with the remainder being paid in 2025. In addition, MRM expects a modest expansion of its mining fleet through 2025, with notable additional capacity being added in 2026.

The new processing plant, funded by cash resources and debt, is expected to become operational during the first half of 2025.

The Montepuez mine provides more than half of the world’s supply of quality rubies, delivering over $100 million in tax revenue to the government, and over 1% of revenue allocated to establishing community and conservation projects, according to Gemfields.