Holcim Grantville has two AG45s on site which are made for the conditions and driving the clay tracks.
Holcim Australia’s Grantville Quarry utilises two articulated dump trucks and two front-loaders to stay on top of the competition, thanks to a partnership with Delta Rent.
The Grantville Quarry, which is a joint venture between Holcim and Boral, has relied on rented machines from Delta Rent for more than a decade, to ensure it can meet demanding workloads. The quarry supplies Holcim and Boral internally with sand for manufacturing concrete.
Holcim Australia’s Grantville Quarry site supervisor Ron Walker said with the operation being a joint venture, using machinery from Delta on-site provided access to the latest machines without significant up front investment.
Holcim Grantville has two L260Hs on-site and has been impressed with its handling of on-site conditions.
Delta’s rental division, established in 2005, offers flexible short-term, medium, and long-term rental plans to help any site or project-specific requirement. The heavy plant hire division operates across Australia with offices in Melbourne, Sydney, Brisbane and Adelaide.
“As we operate a joint venture between Boral and Holcim we tend not to own our equipment/machinery,” Walker said.
“So, we partner with Delta Rent – giving our employees access to the latest state-of-the-art reliable machines. This is imperative as our operation is reasonably high hours for a rental.”
Holcim’s Grantville site, located around 90 minutes from Melbourne, needed machines that could handle the clay track around the site in the wet and sodden tracks in the Victorian winter.
The Volvo L260H’s larger bucket capacity of 7.1 cubic metres compared to previous models to improve efficiency.
Delta Rent, which has one of the largest rental fleets in Australia, supplied the Victorian operation with two articulated dump trucks and two front-wheel loaders.
The articulated dump trucks are designed for off-road sites which require heavy-duty usage, predictive gear selection, downhill speed control and a high payload capability.
Walker said it was crucial Delta Rent was able to match the needs of the site with machines in its fleet.
“They run through pretty hard conditions in winter and all our tracks are clay, which can become quite wet. Despite the weather conditions, we still need to operate as much as we can,” Walker said.
“Delta Rent provides us with very reliable trucks, along with superior comfort for the operators.”
One of the key features the front end wheel loaders offer is a large capacity of 7.1 cubic metres, allowing 11.5 per cent more material to be loaded than previous models. This enables the road trucks to be loaded and sent out faster, increasing the site’s efficiency.
Delta Rent Account Manager Andrew Hagan said the company focused on the customer’s needs, with a rental and service based model that customers can rely on to help operations run smoothly.
In the case of the articulated hauler, its ability to handle “wet and uneven terrain very well” became a major factor given Holcim’s Grantville site, according to Hagan.
“The turnaround time to get trucks in and loaded was definitely seen as a benefit because they didn’t want trucks lining up at the gate, you just want them out.”
“Fuel burn was also a critical factor to the operation to lower production costs.”
“The support and 24–7 service Delta Rent provides is reliable, consistent, and gives our customers comfort knowing they can access immediate help when they need it,” he said.
Delta Rent provides maintenance on the high-risk and capital-intensive machines to ease pressures for workers on-site.
The support system minimises unexpected maintenance and associated downtime.
“We rely on Delta’s after-hours service, so when something breaks down and we need it repaired pretty quickly, they’re onto it immediately,” Walker said.
“I manage the gear and liaise with Delta to do all the repairs and upkeep of the trucks. They’re usually pretty prompt getting out and getting the gear repaired as quickly as they can, which works for us because if the machine isn’t running, it is downtime for us and loss of production.”
Walker, who has spent around 40 years in the industry, really appreciates the level of service and quality of the machines.
“They’ve always been a good company to deal with, and they’re very good at keeping their gear on the move,” Walker said.
“Knowing Delta Rent is there helps us maintain focus on our core business.”
UGL has moved to a new manufacturing facility in Auburn, New South Wales, from where it will continue to support the railway industry.
The facility is more modern than the previous one and better equipped at accommodating people living with a disability. It will be more efficient, comprised of one single facility rather than lots of small buildings.
The move comes after the company spent nearly 50 years at its former location, in Milperra.
UGL Managing Director Doug Moss said the company was constantly evolving and remained a leader in the rail industry.
“Our new Auburn facility will allow us to grow and continue to innovate, but it’s our people that make UGL great,” he said.
“We are lucky enough to have a breadth of knowledge and experience, with some of our employees working for us for 30 years or more.
“We are a local manufacturer employing local people, using the latest in innovative design and combining it with all that fantastic experience.”
A sustainable approach to the move was undertaken, achieving:
71.6 tonnes of steel recycled
11.2t of aluminium recycled
10.5t of copper recycled
13.5t of paper and cardboard
The new manufacturing facility produces, repairs and tests signalling equipment and traction equipment, including:
Signal wayside equipment
Solid state interlocking
Train protection systems
Trackside cabinets
Rectifiers for traction power
Heavy DC traction circuit breakers
The site will play a crucial role within the industry, with UGL’s radio and signalling construction teams currently supporting major NSW infrastructure projects.
As well, UGL strives to transform train travel by supporting Future Railway Mobile Communication Systems (FRMCS) in Australia once the standards are finalised in Europe, and through the adoption of new technologies.
“It may be a new address, but we have the same high standard of quality and commitment our clients and communities have experienced for decades,” Moss said.
Strandline’s project portfolio contains high quality assets which offer a range of development options and timelines, geographic diversity, and scalability. They include the world-scale Coburn mineral sands project in Western Australia, currently ramping up into production, and the emerging Tanzanian mineral sands growth projects Fungoni, Tajiri, and Bagamoyo.
Strandline’s exploration and development focuses primarily on discovering and evaluating mineral sands ore bodies that show an abundance of higher value minerals, nominally zircon, rutile and monazite, with the lesser value minerals of ilmenite and garnet as a co-product to the product suite.
Mineral sands are heavy minerals found in sediments on, or near to, the surface of ancient beach, river or dunal system. Strandline’s proposed mineral sands mining method involves both dry mining (Coburn and Fungoni projects) and wet hydraulic mining (Tajiri project). Mining units and wet concentration plant (WCP) separate the heavy valuable minerals (zircon, monazite, rutile, leucoxene, ilmenite) from the waste material. The WCP design utilises multiple stages of high-capacity gravity separation and classification to produce a high grade +90% heavy mineral concentrate (HMC).
South32’s Sierra Gorda copper mine in Chile. Image: South32
ARI was on hand for a recent fireside chat with South32 CEO Graham Kerr, who reflected on how the major mining company has gotten to where it is today.
South32, which was demerged from BHP in 2015, describes itself as a “globally diversified mining and metals company” and is now transitioning to become a key manganese producer in the US.
The company’s future is certainly bright, but chief executive officer Graham Kerr admitted South32 initially had a portfolio that could only be described as a “mixed bag”.
“Within BHP, there are lots of assets that have a lot of opportunity for development in the future that weren’t quite getting the love or systems they needed,” he said during a fireside chat at a recent Melbourne Mining Club luncheon.
“For me, the demerger was a great opportunity for both companies to be better than what they were together. (And) both companies have continued to change and evolve.”
South32’s commodity mix included energy coal, metallurgical coal and manganese, with nickel, lead, silver, zinc and aluminium also featuring in the portfolio.
It was from this position that Kerr and his colleagues set about finding potential in base metals.
Eight years on, the company’s portfolio has changed a lot since Kerr sat in the first South32 meeting with then-chairman David Crawford.
“We certainly had a belief for what assets belonged in South32 and what assets didn’t belong in South32,” Kerr said.
“If you take a step back, what we did actually recognise is if you look at the world today, with a lot of the M&A activity that occurred in the prior two decades, most of the mid-tier mining companies had disappeared.
“So part of the advantage of South32 was it’s a mid-tier-sized mining company … and for a mid-tier company, you only need one or two great discoveries or one or two great acquisitions and you can fundamentally change the nature of the group and create a lot of value for your stakeholders.
“It was clear some commodities had a more attractive future than others. We talked about wanting copper and we did talk about expanding our zinc and nickel presence, and those commodities in particular have been far more attractive in a world of decarbonisation.”
South32 chief executive officer Graham Kerr.
Those discussions laid the foundations for South32 as the company transitioned its portfolio and projects to be largely based in the Americas.
The US Government’s recent endorsement of the Hermosa project, located in southern Arizona, has meant South32 could become the country’s primary manganese producer.
Hermosa, which has the potential to produce manganese and zinc, has been added to the FAST-41 project list, which is designed to create better processes for complex critical infrastructure projects. Hermosa is one of the first mining projects to join the program, which could assist it with obtaining federal permits for the development of South32’s Taylor and Clark deposits, both of which are located within the Hermosa project.
According to Kerr, once the Taylor and Clark projects are up and running, South32’s portfolio composition will rise to 85 per cent base metals, with majority of the company’s value in the Americas.
“The inclusion of Hermosa as the first mining project added to the FAST-41 process is an important milestone that recognises the project’s potential to strengthen the domestic supply of critical minerals in the US,” Kerr said. “The project presents a significant opportunity to sustainably produce commodities critical to a low-carbon future.”
South32 is advancing a Clark feasibility study, with a pilot plant recently commencing production. A feasibility study for the Taylor deposit is expected to be completed later this year.
A key part of the project will see South32 engage with local communities to ensure the project has flow-on benefits to the surrounding area.
“Becoming a covered FAST-41 project will make the rigorous federal environmental review and permitting process for this project more transparent, predictable and inclusive for all stakeholders,” South32 Hermosa president Pat Risner said.
“We are committed to working closely with the US Forest Service, cooperating agencies, Native American tribes, and local stakeholders in Santa Cruz County in Arizona to develop this project in a way that benefits the community, minimises impact on the environment, and creates opportunities across the region.”
Alongside its US assets, South32 also has growth options in South America, including a bright future for its Sierra Gorda copper mine in Chile.
South32 purchased a 45 per cent stake in Sierra Gorda in February 2022, but while the company has long been keen to boost its copper presence, it took time to warm up to Sierra Gorda.
“How many people in the room have watched Shrek with their kids before?” Kerr asked the Melbourne Mining Club audience. “There’s a bit where the donkey is talking to Shrek and says, ‘Shrek, you’re like an onion. You’ve got to take the layers off the onion to understand what you’ve actually got’.
“When the business development team first brought Sierra Gorda to me, I was probably like most other people in the market and thought, ‘This is a challenged asset. It’s got a history of having a challenging ramp-up and there’s very little information in the marketplace about it’.
“Every challenge we gave to the business development team to take a layer off that onion, they came back with more positive results.
“In the end, we became convinced that it was the right thing to do.
“We’ve had it for about a year now and we’re really happy with the acquisition. We’ve been really surprised by the upside in the asset and the quality of the people.”
South32’s Hermosa project in southern Arizona.
Alongside its Chile presence, South32 is also involved in earn-in agreements with two emerging copper exploration projects in Argentina – Chita Valley and Don Julio.
South32 recently exercised its earn-in right to acquire a 50.1 per cent interest in the Chita Valley project following a three-year exploration partnership with Minsud Resources Corp.
The major miner signed an earn-in agreement with Sable Resources to explore Don Julio in 2021, with drilling advancing at the project.
Kerr said Argentina could be a copper jurisdiction to keep an eye on in years to come.
“Argentina’s become an interesting location,” he said.
“When we first started doing some work there, we were probably the only ones. You’ve got BHP there, you’ve got Barrick there, you’ve Glencore there – everyone’s sort of pouring money into that jurisdiction at the moment.
“If you look at where it is, it’s on the other side of the Chile mountains where basically all the copper is.
“So I think that’s an area that’s going to develop pretty quickly.”
Whether it’s the Hermosa project in the US, a suite of emerging projects in South America, or any other ‘future-facing’ asset in South32’s portfolio, the company has plenty of avenues to be part of the world’s decarbonisation narrative in the years to come.
And given South32’s strong track record of project execution and expansion, the company’s shareholders can rest assured their stock is in the right place.
South32’s Sierra Gorda copper mine in Chile. Image: South32
ARI was on hand for a recent fireside chat with South32 CEO Graham Kerr, who reflected on how the major mining company has gotten to where it is today.
South32, which was demerged from BHP in 2015, describes itself as a “globally diversified mining and metals company” and is now transitioning to become a key manganese producer in the US.
The company’s future is certainly bright, but chief executive officer Graham Kerr admitted South32 initially had a portfolio that could only be described as a “mixed bag”.
“Within BHP, there are lots of assets that have a lot of opportunity for development in the future that weren’t quite getting the love or systems they needed,” he said during a fireside chat at a recent Melbourne Mining Club luncheon.
“For me, the demerger was a great opportunity for both companies to be better than what they were together. (And) both companies have continued to change and evolve.”
South32’s commodity mix included energy coal, metallurgical coal and manganese, with nickel, lead, silver, zinc and aluminium also featuring in the portfolio.
It was from this position that Kerr and his colleagues set about finding potential in base metals.
Eight years on, the company’s portfolio has changed a lot since Kerr sat in the first South32 meeting with then-chairman David Crawford.
“We certainly had a belief for what assets belonged in South32 and what assets didn’t belong in South32,” Kerr said.
“If you take a step back, what we did actually recognise is if you look at the world today, with a lot of the M&A activity that occurred in the prior two decades, most of the mid-tier mining companies had disappeared.
“So part of the advantage of South32 was it’s a mid-tier-sized mining company … and for a mid-tier company, you only need one or two great discoveries or one or two great acquisitions and you can fundamentally change the nature of the group and create a lot of value for your stakeholders.
“It was clear some commodities had a more attractive future than others. We talked about wanting copper and we did talk about expanding our zinc and nickel presence, and those commodities in particular have been far more attractive in a world of decarbonisation.”
South32 chief executive officer Graham Kerr.
Those discussions laid the foundations for South32 as the company transitioned its portfolio and projects to be largely based in the Americas.
The US Government’s recent endorsement of the Hermosa project, located in southern Arizona, has meant South32 could become the country’s primary manganese producer.
Hermosa, which has the potential to produce manganese and zinc, has been added to the FAST-41 project list, which is designed to create better processes for complex critical infrastructure projects. Hermosa is one of the first mining projects to join the program, which could assist it with obtaining federal permits for the development of South32’s Taylor and Clark deposits, both of which are located within the Hermosa project.
According to Kerr, once the Taylor and Clark projects are up and running, South32’s portfolio composition will rise to 85 per cent base metals, with majority of the company’s value in the Americas.
“The inclusion of Hermosa as the first mining project added to the FAST-41 process is an important milestone that recognises the project’s potential to strengthen the domestic supply of critical minerals in the US,” Kerr said. “The project presents a significant opportunity to sustainably produce commodities critical to a low-carbon future.”
South32 is advancing a Clark feasibility study, with a pilot plant recently commencing production. A feasibility study for the Taylor deposit is expected to be completed later this year.
A key part of the project will see South32 engage with local communities to ensure the project has flow-on benefits to the surrounding area.
“Becoming a covered FAST-41 project will make the rigorous federal environmental review and permitting process for this project more transparent, predictable and inclusive for all stakeholders,” South32 Hermosa president Pat Risner said.
“We are committed to working closely with the US Forest Service, cooperating agencies, Native American tribes, and local stakeholders in Santa Cruz County in Arizona to develop this project in a way that benefits the community, minimises impact on the environment, and creates opportunities across the region.”
Alongside its US assets, South32 also has growth options in South America, including a bright future for its Sierra Gorda copper mine in Chile.
South32 purchased a 45 per cent stake in Sierra Gorda in February 2022, but while the company has long been keen to boost its copper presence, it took time to warm up to Sierra Gorda.
“How many people in the room have watched Shrek with their kids before?” Kerr asked the Melbourne Mining Club audience. “There’s a bit where the donkey is talking to Shrek and says, ‘Shrek, you’re like an onion. You’ve got to take the layers off the onion to understand what you’ve actually got’.
“When the business development team first brought Sierra Gorda to me, I was probably like most other people in the market and thought, ‘This is a challenged asset. It’s got a history of having a challenging ramp-up and there’s very little information in the marketplace about it’.
“Every challenge we gave to the business development team to take a layer off that onion, they came back with more positive results.
“In the end, we became convinced that it was the right thing to do.
“We’ve had it for about a year now and we’re really happy with the acquisition. We’ve been really surprised by the upside in the asset and the quality of the people.”
South32’s Hermosa project in southern Arizona.
Alongside its Chile presence, South32 is also involved in earn-in agreements with two emerging copper exploration projects in Argentina – Chita Valley and Don Julio.
South32 recently exercised its earn-in right to acquire a 50.1 per cent interest in the Chita Valley project following a three-year exploration partnership with Minsud Resources Corp.
The major miner signed an earn-in agreement with Sable Resources to explore Don Julio in 2021, with drilling advancing at the project.
Kerr said Argentina could be a copper jurisdiction to keep an eye on in years to come.
“Argentina’s become an interesting location,” he said.
“When we first started doing some work there, we were probably the only ones. You’ve got BHP there, you’ve got Barrick there, you’ve Glencore there – everyone’s sort of pouring money into that jurisdiction at the moment.
“If you look at where it is, it’s on the other side of the Chile mountains where basically all the copper is.
“So I think that’s an area that’s going to develop pretty quickly.”
Whether it’s the Hermosa project in the US, a suite of emerging projects in South America, or any other ‘future-facing’ asset in South32’s portfolio, the company has plenty of avenues to be part of the world’s decarbonisation narrative in the years to come.
And given South32’s strong track record of project execution and expansion, the company’s shareholders can rest assured their stock is in the right place.
Mid-tier Australian gold producer Regis Resources has released its annual mineral resource and ore reserve update for the 2022 calendar year.
The company said its mineral resources and ore reserves show progress against its long-term strategy, as well as provides a solid platform to launch the next phase of growth.
Highlights from the report include underground reserves outpaced depletion for the second year in a row as new results highlight underground life extensions at the Duketon gold project and the Tropicana joint venture, which Regis Resources chief executive officer Jim Beyer said was pleasing to see.
“We are extremely pleased that our underground mines at both Duketon and Tropicana have outpaced depletion for the second year in a row. We have spent the last two years investing in these mines and it is very satisfying to deliver reserve growth on these investments over this short time horizon,” Beyer said.
“It is still early days in the maturity of these undergrounds and we look forward to the continuing growth potential as we mine deeper. Our long reserve life of eight years and located wholly within Australia provides a strong platform to deliver on our long-term growth objectives and achieve superior returns for our shareholders.”
Other highlights from the report includes group ore reserves of 3.6 million ounces (Moz) and group mineral resources of 7.0Moz, both as of 31 December 2022.
There was an increase in new ore reserves of 210,000 ounces (koz) and an increase in new mineral resources of 400koz, both offset by the 2022 calendar year depletion.
Long term gold price assumptions for the calculation of reserves and resources were updated but remain at moderate levels at a weighted average of $1800 per ounce for reserves and $2430 per ounce for resources.
Additionally, early results from the Garden Well exploration decline at the Duketon project has reinforced the potential for a new production front and growth in ounces per vertical metre. The underground site also established an exploration target.
Coal miner Glencore will sell its CSA copper mine in Cobar, New South Wales, to Metals Acquisition Corp (MAC) for $US1.1 billion ($1.64 billion).
CSA is an established, high-grade producing, long-life underground copper mine with an estimated current mine life of over 15 years, and MAC has identified opportunities to further extend it, subject to exploration success.
The sale is the latest indicator of copper’s growing importance, after Evolution Mining extended its Ernest Henry mine life to 2040 earlier this week.
Similarly, South32 is looking to grow its portfolio, identifying a copper mine that could be an M&A fit. The copper outlook continues to be supported by the rising decarbonisation narrative, with the commodity a highly efficient conduit for renewable energy systems such as solar, wind, hydro and thermal energy.
The Glencore/MAC deal has been on the table for some time now, with the companies entering into an agreement back in March 2022.
“The acquisition of CSA represents a strong strategic fit for MAC. Our management team’s operational expertise, understanding of regional operations and relationships with local stakeholders uniquely position us to identify and realise the full potential value of the asset,” MAC chief executive officer Mick McMullen said at the time.
“We believe that copper has favourable fundamentals that will continue to support an elevated copper price.
“Copper is expected to play a key role in the global energy transition ‘megatrend’, with approximately one million tonnes per annum of new supply required from 2024 onwards in order to meet the surging demand forecast.
“With few new projects globally in the pipeline, increasing permitting issues and jurisdictional risk, and declining copper grades across the industry, we believe that there are significant challenges ahead to close the projected supply deficit.”
MAC will acquire 100 per cent of the issued share capital of Cobar Management from Glencore. Cobar Management owns and operates the mine.
The company has made arrangement for the copper streams with Osisko Gold Royalties in the US.
“CSA is a high-grade, long-life asset, with significant upside that can be unlocked by the MAC management team,” Osisko president and chief executive officer Sandeep Singh said.
“We are pleased to see this important transaction nearing completion, and look forward to having both the silver and copper streams contribute to our near-term cash flows.”
Evolution Mining has doubled the copper and gold reserves and extended the mine life to 2040 since it purchased the Ernest Henry mine outright in January 2022.
The completion of Ernest Henry’s mine-extension pre-feasibility study (PFS) – announced on Monday – has seen the mine’s ore reserve increase 126 per cent from a December 2022 estimate to 77.4 million tonnes, with contained copper increasing 103 per cent to 589,000 tonnes and contained gold jumping 124 per cent to 1.11 million ounces.
The PFS indicates the mine extension could deliver approximately 655,000 ounces of payable gold and 375,000 tonnes of payable copper, delivering an internal rate of return of 28 per cent (based on a base case of $2400 per ounce of gold and $12,000 per tonne of copper). This equates to a net-present value (NPV) of $690 million.
Capital costs would be $450–500 million, with 60 per cent of this supporting development below the 750mRL (metres relative level). Majority of the capital would not be required until the 2026–27 and 2027–28 financial years.
Ever since Evolution acquired 100 per cent of Ernest Henry, the company has been aggressively exploring the project, regularly announcing resource upgrades and increases in the mine’s copper potential.
Evolution has also announced its board has greenlit capital investment for the expansion of its Mungari plant in WA, with a $250 million investment to boost throughput from 2 million tonnes per annum (Mtpa) to 4.2Mtpa.
“Mungari has demonstrated its capacity to consistently and reliably deliver approximately 135,000 ounces per annum in recent years,” Evolution managing director and chief executive officer Lawrie Conway said.
“This plant expansion unlocks the very large regional resource base, reduces all-in-sustaining costs (AISC) by 18 per cent to $1750 per ounce, extends the mine life out to 15 years, and grows production to over 200,000 ounces post commissioning.
“The expansion was always envisaged and formed part of our due diligence when we acquired the Kundana and East Kundana properties in 2021. Having successfully integrated the operations, this is now the next logical phase of making Mungari a cornerstone asset of Evolution.”
Evolution has also announced a restructure of its debt profile which it said will unlock an additional $445 million of liquidity over the next three years. The restructure included a $US200 million ($303 million) US private placement (USPP) and the replacement of existing $590 million term loan facilities with a reduced four-year, $300 million loan.
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The Astec GT2612V high-frequency screen has assisted a nickel miner in New Caledonia in re-processing nickel waste.
Astec and mining contractor Salmon NC have developed a bespoke waste retreatment screening solution for a major nickel miner in New Caledonia. And Astec’s screening offerings don’t stop there.
As we near a net-zero reality, there is an increasing need for more materials to develop the necessary green technologies.
Renewable energy sources such as wind and solar require up to five times more copper than comparable non-renewable technologies, while the World Economic Forum believes demand for lithium carbonate equivalent (LCE) could surpass three million tonnes by 2030. The world produced 540,000 tonnes of LCE in 2021.
LCE, derived from lithium raw material, spodumene concentrate, is a critical material in renewable batteries used in electric vehicles (EVs).
While primary production will remain key, as mineral demand increases into the future amid growing decarbonisation, mining companies will need to be more creative in how they commercialise their material.
A nickel mine in New Caledonia, some 1200km east of Queensland’s Sunshine Coast, is doing just that.
SLN (Société Le Nickel), which operates a nickel smelter and several mines on the island, has established a unique method for recycling nickel slag – a major by-product of the nickel refining process – with the assistance of mining contractor Salmon NC and leading mining equipment supplier Astec.
The recycled nickel slag is sold into a variety of markets, including the abrasives industry in the US, where it is used as a sandblasting medium.
While heavy equipment hire has always been Salmon NC’s bread and butter, chief executive officer Chris Salmon turned to Astec when it came to finding the specialty equipment needed to re-process nickel slag.
“I’d known Astec from a past life when I was involved in basalt quarrying, and they’ve always come really well referenced,” Salmon told Australian Mining. “I’d reached out to some industry contacts explaining what I was trying to achieve and Astec’s high-frequency screens were mentioned a couple of times by people I trusted.”
Salmon got in touch with Shaun Quinn, Astec’s senior account manager, materials solutions – northern region, and before too long an Astec GT2612V high-frequency screen had made its way to New Caledonia.
“Shaun was very helpful in identifying the type of unit we wanted,” Salmon said. “We were looking at fixed and tracked solutions, but we chose the tracked machine because we needed mobility around how we were building our stockpiles.
“We’ve been impressed by Astec’s after-sales support, too. We need that support given we’re quite isolated in New Caledonia.”
The Astec GT2612V high-frequency screen has 10 vibrators that directly-induce vibration into the bed of material at between 3600–4200 revolutions per minute (RPM), to ensure increased probability of stratification and material separation.
A unique media rotary tensioning system used on the high-frequency screens means operators of the GT2612V can quickly and efficiently change screen media when switching between applications, supporting a more efficient and productive operation.
And while the GT2612V is powerful, it’s also versatile.
“The screen itself is made up of four six-by-six-foot panels, with the first panels on each deck having three independently adjustable vibrators,” Quinn told Australian Mining.
“The screen operates between 28–43° of inclination, with the vibrators running at up to 4200RPM with as much as 2mm of stroke, so you can ensure they are optimised for each application.
“On average, these machines can induce around 10g of force into the material if you’re running them flat out, but you can also de-tune individual sections accordingly to stop ‘pop-corning’, or the bouncing of the raw material, from occurring.”
The GT2612V was delivered and commissioned to New Caledonia in November 2022 and has been processing large volumes of material ever since.
The process involves feeding stockpiled nickel slag through a static grid to remove larger agglomerates before it reaches the high-frequency screen, which then refines the product into a usable material.
“Minus-50mm material is sent to the high-frequency screen, which separates anything bigger than 4mm,” Quinn said. “Anything smaller is finished product in this application.”
The GT2612V’s adjustability came in handy when the Salmon NC team discovered the nickel slag material was more abrasive than anticipated.
“This briefly caused some operational issues for us,” Salmon said.
“But the Astec support team was fantastic. They helped us make tweaks and adjustments to settings and flow rates, and alter the way we were processing the material to best deal with its abrasive nature.
“Now we’re getting the best out of the machine itself, and the best operational efficiency.”
Since the six-foot-wide GT2612V arrived in New Caledonia in November 2022, Astec has developed a larger eight-foot-wide, 18-foot-long high-frequency screen. Quinn said the new model, launched at CONEXPO in Las Vegas in mid-March, enables greater capacity.
But when finding the right screen for a customer and for a particular application, bigger is not necessarily better.
“It comes down to what customers are looking for,” Quinn said. “If they don’t have room to set up a fixed plant, and if they want something that’s mobile and able to be utilised in a tighter, confined space – as with Salmon NC and the nickel slag application – the tracked screen is ideal.
“But if you’ve got a bit more room, and you’re going to go down the path of investing in a fixed plant, Astec’s new eight-foot-wide screen is going to be something to consider.
Astec’s high-frequency screens will be increasingly important as mineral demand increases amid growing decarbonisation.
“The bottom line is the technology works and, with its multiple tuning options, we will ensure screens are optimised to suit any application and material.”
Quinn said that just a few weeks on from CONEXPO, Astec had already sold two of the eight-foot-wide screens into the local market.
Astec can also build a ‘hybrid machine’ for its customers.
“The offshoot of these machines is our multi-frequency screen,” Quinn said.
“These incorporate a conventional screening action throughout the whole screen but also utilise our high-frequency technology on the bottom deck.
“The high-frequency action provides additional vibration directly into the media on the bottom deck which helps with separation in finer material or wetter applications.“
Whether it’s the GT2612V, the new eight-foot-wide screen, the multi-frequency option, or any other bespoke screening solution, Astec has a solution to suit any mineral processing application. Astec’s screens are proven in repurposing mine waste for a major nickel miner in New Caledonia, and many other Australian mining companies and contractors can attest to the supplier’s capability.
BHP is now officially the parent company of OZ Minerals, with OZ set to be removed from the ASX today.
“This acquisition strengthens BHP’s portfolio in copper and nickel and is in line with our strategy to meet increasing demand for the critical minerals needed for electric vehicles, wind turbines and solar panels to support the energy transition,” BHP chief executive officer Mike Henry said.
“Combining our two organisations will provide options for growth, bring new talent and innovation to unlock these resources in a sustainable way, and deliver value to shareholders and communities.”
The takeover will allow BHP to focus on safe and reliable operation of the Olympic Dam, Prominent Hill and Carrapateena assets.
This week OZ shareholders received $28.25 per OZ share, marking the implementation of the scheme of arrangement. This follows approval of the $9.63 billion deal by the Federal Court earlier this month.
The revised offer was an increase on the original $8.4 billion offer made in August 2022.
OZ Minerals has a number of operations in Brazil, including the Santa Lúcia iron oxide copper-gold mineral deposit, the Antas copper-gold mine, and CentroGold, one of the largest undeveloped gold projects in Brazil.
The acquisition gives BHP access to the company’s significant portfolio of future-facing minerals – namely copper and nickel – that are vital to the world’s push for clean energy.
“As this is the final production report from OZ Minerals, the board and management would like to thank all our stakeholders for their contribution to the company’s success,” OZ Minerals chief executive officer Andrew Cole said.
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