Tag Archives: DRC

Protea Mining Chemicals develops world first copper-cobalt processing solution

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Diversified chemicals group, Omnia Holdings, reports its Protea Mining Chemicals division has become the first in its field – globally – to develop a solution that helps copper and cobalt mines reduce product contamination (improving metal purity levels) and maximise throughput in the solvent extraction (SX) process.

This pioneering solution took six years to develop and was carried out in partnership with chemicals manufacturers and copper and cobalt mining customers in the Democratic Republic of the Congo, Omnia said.

“Finding safer, more efficient ways to extract valuable resources and enhance profitability continues to be a priority in the mining sector – which has been particularly constrained by the impacts of the COVID-19 pandemic,” the company said.

“This discovery will extend the life of copper and cobalt mines and assist profitability. Protea Mining Chemicals is working closely with other mines to replicate this success in other regions.”

Michael Smith, Managing Director at Protea Mining Chemicals (pictured), said: “Over the past few decades, many unsuccessful attempts have been made by mining houses, global chemical manufacturers, as well as SX equipment and process engineers to address this issue of contamination. Needless to say, this has been a very challenging journey and we are delighted by what we have been able to achieve.”

The news comes hot on the heels of Omnia’s BME breaking the South African record for the largest electronic detonator blast.

Latest Kamoa-Kakula copper studies reaffirm project’s world-class status

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The latest economic studies on Ivanhoe Mines and Zijin Mining Group’s majority-owned Kamoa-Kakula project in the Democratic Republic of Congo have indicated the asset could become the world’s second largest copper mining complex.

First production at Kamoa-Kakula is less than a year away, but the project partners have continued with a series of economic studies that emphasise the world-class nature of the orebodies within their control.

The headline maker is the results of a preliminary economic assessment that has evaluated an integrated, multi-staged development to achieve a 19 Mt/y production rate at the mine, with peak annual copper production of more than 800,000 t.

At the same time, a prefeasibility study (PFS) has been carried out to look at mining 1.6 Mt/y from the Kansoko mine, in addition to 6 Mt/y already planned to be mined from Kakula, to fill a 7.6 Mt/y processing plant at Kakula.

A definitive feasibility study (DFS) has also evaluated the stage-one, 6 Mt/y plan at Kakula, which is currently being constructed and is less than a year away from producing first copper, according to Ivanhoe Co-Chair, Robert Friedland.

While the operation looks to have the scale of a world-class asset, it will also have top ranking ‘green’ credentials, according to Friedland.

“The Kakula mine has been designed to produce the world’s most environmentally-responsible copper, which is crucial for today’s new generation of environmentally- and socially-focused investors,” he said.

“Zijin shares our commitment to build the new mines at Kamoa-Kakula to industry-leading standards in terms of resource efficiency, water and energy usage, and minimising emissions. We are blessed with ultra-high copper grades in thick, shallow and flat-lying orebodies – allowing for large-scale, highly-productive, mechanised underground mining operations; and access to abundant clean, sustainable hydro electricity to power our mines – providing us with a distinct advantage in our goal to become the world’s ‘greenest’ copper miner and be among the world’s lowest greenhouse gas emitters per unit of copper produced.”

The project recently retained Hatch of Mississauga, Canada, to independently audit the greenhouse gas intensity metrics for the copper that will be produced at Kamoa-Kakula.

The Kamoa-Kakula Integrated Development Plan (IDP) 2020, as the companies refer to it, builds on the results of the previous studies announced in February 2019.

DFS to 6 Mt/y

The new DFS incorporates the advancement of development and construction activities to date, and has once again confirmed the outstanding economics of the first phase Kakula Mine, Ivanhoe said.

It evaluates the development of a stage one, 6 Mtpa underground mine and surface processing complex at the Kakula deposit with a capacity of 7.6 Mt/y, built in two modules of 3.8 Mt/y, with the first already under advanced construction (see photo). It comes with an internal rate of return of 77% and project payback period of 2.3 years.

The first module of 3.8 Mt/y commences production in the September quarter of 2021, and the second in the March quarter of 2023. The life-of-mine production scenario provides for 110 Mt to be mined at an average grade of 5.22% Cu, producing 8.5 Mt of high-grade copper concentrate.

The Kakula 2020 DFS mine access is via twin declines on the north side and a single decline on the south side of the deposit. One of the north declines will serve as the primary mine access, while the other decline is for the conveyor haulage system, which was recently commissioned.

The primary ore handling system will include a perimeter conveyor system connected to truck load-out points along the north side of the deposit. The perimeter conveyor system will terminate at the main conveyor decline.

The mining method for the Kakula deposit is primarily drift-and-fill using paste backfill (around 99%); with the exception of a room-and-pillar area close to the north declines, which will be mined in the early years of production. The paste backfill system will use a paste plant located on surface connected to a distribution system that includes a surface pipe network connected to bore holes located at each connection drive on the north side of the orebody, the company says.

The Kakula concentrator design incorporates a run-of-mine stockpile, followed by primary cone crushers operating in closed circuit with vibrating screens to produce 100% passing 50 mm material that is stockpiled.

At the end of August, the project’s pre-production surface ore stockpiles totalled an estimated 671,000 t grading 3.36% Cu, including 116,000 t of high-grade ore grading 6.08% Cu.

The crushed ore is fed to the high pressure grinding rolls operating in closed circuit with wet screening, at a product size of 80% (P80) passing 4.5 mm, which is gravity fed to the milling circuit.

The milling circuit incorporates two stages of ball milling in series in closed circuit with cyclone clusters for further size reduction and classification to a target grind size of 80% passing 53 micrometres (µm).

The milled slurry is pumped to the rougher and scavenger flotation circuit where the high-grade, or fast-floating rougher concentrate, and medium-grade, or slow-floating scavenger concentrate, are separated for further upgrading. The rougher concentrate is upgraded in the low entrainment high-grade cleaner stage to produce a high-grade concentrate.

The medium-grade or scavenger concentrate together with the tailings from the high-grade cleaner stage and the recycled scavenger recleaner tailings are combined and further upgraded in the scavenger cleaner circuit. The concentrate produced from the scavenger cleaner circuit, representing roughly 12% of the mill feed, is re-ground to a P80 of 10 µm prior to final cleaning in the low entrainment scavenger recleaner stage.

The scavenger recleaner concentrate is then combined with the high-grade cleaner concentrate to form final concentrate. The final concentrate is then thickened and pumped to the concentrate filter. Final filtered concentrate is then bagged for shipment to market.

The scavenger tailings and scavenger cleaner tailings are combined and thickened prior to being pumped to the backfill plant and/or to the tailings storage facility. Backfill will use approximately half of the tailings, with the remaining amount pumped to the tailings storage facility.

Based on extensive test work, the concentrator is expected to achieve an overall recovery of 85%, producing a very high-grade concentrate grading 57% copper. Kakula also benefits from having very low deleterious elements, including arsenic levels of 0.02%.

7.6 Mt/y PFS

The PFS evaluating mining 1.6 Mt/y from the Kansoko mine envisages an average annual production rate of 331,000 t of copper at a total cash cost of $1.23/lb copper for the first 10 years of operations, and annual copper production of up to 427,000 t by year four. This comes with an internal rate of return of 69% and project payback period of 2.5 years, according to Ivanhoe.

Development would see Kakula-Kansoko benefit from an ultra-high, average feed grade of 6.2% Cu over the first five years of operations, and 4.5% Cu on average over a 37-year mine life.

There are currently two mining crews at Kansoko, in addition to the 10 mining crews (three owner crews and seven contractor crews) currently at Kakula, with the ability to increase this number to fast-track the development of Kansoko, Ivanhoe said.

19 Mt/y option

The Kamoa-Kakula 2020 PEA presents initial production from Kakula at a rate of 6 Mt/y, followed by subsequent, separate underground mining operations at the nearby Kansoko, Kakula West and Kamoa North mines, along with the construction of a 1 Mt/y of concentrate direct-to-blister smelter. The smelter section of the study saw China Nerin Engineering act as the main engineering consultant with Outotec providing design and costing for propriety equipment.

The Kamoa North Area comprises five separate mines that will be developed as resources are mined out elsewhere to maintain the production rate at up to 19 Mt/y, with an overall life in excess of 40 years, Ivanhoe says.

For this integrated 19 Mt/y option, the PEA envisages $700 million in remaining initial capital costs, with future expansion at Kansoko, Kakula West and Kamoa North funded by cash flows from the Kakula mine, resulting in an internal rate of return of 56.2% and a payback period of 3.6 years.

This shows the potential for average annual production of 501,000 t of copper at a total cash cost of $1.07/lb copper during the first 10 years of operations and production of 805,000 t/y of copper by year eight, Ivanhoe said.

“At this future production rate, Kamoa-Kakula would rank as the world’s second largest copper mine,” the company said.

Clean TeQ DESALX plant up and running at Kirkland Lake’s Fosterville gold mine

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Clean TeQ Holdings Limited has formally handed over a Continuous Ion Exchange Desalination (DESALX®) plant to Kirkland Lake Gold’s Fosterville gold mine in Victoria, Australia.

Clean TeQ says it was engaged to design, supply and commission a two million litre-per-day Clean TeQ DESALX mine water treatment plant, with the plant designed to deliver a sustainable water management solution by treating mine process water.

The plant construction was completed in late 2019, with commissioning and operations commencing in early 2020. Now, Clean TeQ has confirmed the plant has passed the performance tests specified in the engineering, procurement and construction contract and the customer has issued a formal notice of acceptance and completion, it said.

Sam Riggall, Clean TeQ CEO, said: “After successfully demonstrating the world’s first ever commercial scale CIF plant in Oman late last year, this is yet another moment of great significance for Clean TeQ.

“Confirmation of the successful deployment of our innovative DESALX solution for this application, designed and delivered by Clean TeQ, is strong validation of our proprietary continuous ion exchange technology, and provides us with a firm foothold in the mining waste water treatment market from which we can continue to grow the business.”

The DESALX technology consists of two continuous ionic filtration (CIF®) modules in series removing divalent cations and anions present in the water through complementary processes. The modules contain ion exchange resins that are cycled between columns using air lifts, allowing for continuous operation and regeneration of the system. This system increases impurity removal efficiency, reduces chemical use, and provides protection against fouling, according to Clean TeQ.

The DESALX solution is well suited to purification of difficult to treat waste waters with high hardness, sulphate, and heavy metals as well as suspended solids which can foul reverse osmosis membranes. These types of waste waters are common in the mining industry, including acid mine drainage water, the company explained.

At Fosterville, the equipment provided by Clean TeQ includes a precipitation package to remove antimony and arsenic. The effluent from the clarifiers is treated by the DESALX plant to remove sulphate, calcium and magnesium with gypsum as the only by-product. The DESALX effluent is then further treated by reverse osmosis to produce water for re-use.

“The Clean TeQ system is a key enabling component of the customer’s overall water management strategy which includes a medium-term target of creating a true ‘zero liquid discharge’ solution that does not produce any saline brine and includes aquifer reinjection,” Clean TeQ said.

Clean TeQ Water is now focused on completing one additional key project at a copper-cobalt mine in the Democratic Republic of the Congo, and a number of pilot programs in China.

“This Clean TeQ system, as well as the plants recently completed in Oman and Australia, are the first of their type anywhere in the world and have been deployed as part of three different technical solutions,” the company said. “The successful delivery and commissioning of these plants provides strong demonstration of the efficacy of Clean TeQ’s suite of proprietary ion exchange technologies and their versatility for metal extraction and wastewater treatment. As commercial scale plants, the facilities provide a valuable platform from which to now rapidly grow Clean TeQ Water.”

MacLean Engineering up to the Africa mining challenge

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MacLean Engineering’s investment in Africa is paying off, with multiple production support vehicle sales recently secured on the back of an increased presence in South Africa.

Having last month bolstered its largest single fleet in Africa to 11 vehicles at the Kibali gold mine, in the Democratic Republic of Congo, the company is now busy assembling equipment for delivery at an underground mine in Namibia, while making manufacturing and delivery plans for a successful tender for five units that will head to a underground gold mine in Mali.

John-Paul Theunissen, MacLean’s General Manager for Africa, says recent sales could be put down to the company boosting its manufacturing and service capacity on the continent close to two years ago.

“We are now manufacturing for Africa out of South Africa,” he told IM. “Towards the end of 2018/beginning of 2019, we commissioned another 900 sq.m of manufacturing space at our South Africa facility. This means we now have 1,000 sq.m of workshop and assembly space.”

The Free State facility, the first international branch MacLean set up back in the 1990s, also offers maintenance and service support.

These attributes, plus the ability to access MacLean engineers across the globe for equipment troubleshooting, have allowed Africa-based mining companies to get comfortable with the Canada-based brand, according to Theunissen.

“We have really started to build momentum in Africa, increasing the level of service and support closer to home,” he said.

“It is this local aspect that really sells fleets, as opposed to individual machines.”

MacLean now has 1,000 sq.m of workshop and assembly space, Theunissen says

This increased local offering has arrived at just the right time.

While the stricter lockdown measures in South Africa have been lifted – the country has moved from Level 5 to Level 3, allowing mines to return to full capacity (with COVID-safe procedures in place) – companies procuring equipment for Africa are conscious intercontinental deliveries could face upheaval again if a ‘second wave’ of COVID-19 hits.

Some mining companies influenced by recent lockdowns are also making longer-term pledges to adjust their supply chains to take advantage of local expertise, at the same time reducing potential risks that come with buying machines and solutions from overseas suppliers.

This recently enlarged presence in Africa could see MacLean benefit from such moves.

Recent orders

The latest orders Theunissen mentioned could reflect this reality.

In securing a contract to supply three MacLean 3-Series Cassette Trucks (CS3) and four cassettes to the Murray & Roberts Cementation and Lewcor Mining joint venture set to establish the underground stoping horizon at the Wolfshag zone at B2Gold’s Otjikoto mine, in Namibia, the company achieved several ‘firsts’, he said.

“It’s a new customer, Murray & Roberts; a new country, Namibia; and a new miner, B2Gold,” he said.

These units will be assembled in South Africa – another MacLean first – and are due to be delivered to the mine by the end of the last quarter of the year, according to Theunissen.

And, as mentioned before, the company recently bolstered the fleet at the Barrick Gold/AngloGold Ashanti majority owned Kibali gold mine in the DRC.

The latest piece of equipment for the mine – which arrived at the end of July – was one of the company’s personnel carriers.

This adds to the three EC3 Emulsion Chargers, a WS3 Water Sprayer, a FL3 Fuel Lube Truck, and a BT3 Boom Truck – all from MacLean’s trusted Mine-Mate™ Series – that Byrnecut, the original mining contractor at Kibali, brought in from 2013 onwards.

When the Kibali mining model changed to ‘owner-operator’ under the management of Randgold (now Barrick), the fleet got bigger, with the miner adding four new rigs: another EC3, another BT3, an SL3 Scissor Lift with pipe handler attachment, and a TM2 Mobile Concrete Mixer.

MacLean says its expanding presence at Kibali, from the development phase all the way back in 2013 up to achieving record production numbers in 2019 and 2020, illustrates the “MacLean Advantage in action”.

It explained: “MacLean’s dedicated team in South Africa has worked closely with mine management and operators to provide the training, maintenance and support needed to keep Kibali running smoothly. With operations forecast to continue at Kibali through 2036, MacLean looks forward to providing dependable support for years to come.”

Tech take-up

Mines like Kibali – one of the most technologically advanced in Africa – are gradually becoming more and more automated in an effort to increase productivity and safety.

Already one of the world’s most highly automated underground gold mines, Kibali’s backbone is Sandvik’s AutoMine Multi Fleet system, supervised on surface by a single operator. This system, in a world first, allows a fleet of up to five LHDs to be operated autonomously, 750 m below the surface, within the same 6 m x 6 m production drive while using designated passing bays to maintain traffic flow, Barrick says. A similar system is used in the production levels to feed the ore passes, according to the company.

While MacLean’s production support vehicles often interact with these autonomous loaders, for the time being they are still manned by operators.

This is set to change into the future, according to Theunissen.

“The Advanced Vehicle Technology Team (AVT) in Canada is moving into the automation space,” he said. “We’re looking to integrate our own digitalised systems into those of OEMs such as Sandvik and Epiroc to ensure fully interoperable autonomous operation.”

Within the AVT, the Advanced Vehicle Technology group embedded at the MacLean Research and Demonstration Facility, in Sudbury, Ontario (pictured below), has over 20 engineering staff working on remotely controlled to fully autonomous vehicle operation, using radar, LiDAR, and vehicle monitoring technology, according to MacLean.

This team has already come up with vehicle telemetry hardware and software, and virtual reality training tools. It is also transitioning to a cloud-based platform for documentation, parts ordering, and training content called Documoto.

The Advanced Vehicle Technology group is embedded at the MacLean Research and Demonstration Facility, in Sudbury, Ontario (photo: James Hodgins)

While these technology developments will, in the future, underwrite the company’s transition to offering machines capable of fully autonomous operation, MacLean is already at the front of the pack when it comes to facilitating the industry’s electrification movement.

In Canada, it has more than 30 battery electric mining vehicles (BEVs) working underground – at 10 mine sites, across four provinces, with more than 50,000 operating hours amassed.

While Africa as a whole might not yet have the energy infrastructure in place to fully leverage these ‘green’ BEVs – many mines remain off grid and reliant on diesel power – Theunissen has seen grid-connected miners in South Africa show interest in taking on these machines.

“In South Africa there is already appetite for BEVs,” he said. “We see it coming through in the RFIs (request for information) we get on projects.”

MacLean has an advantage over some of its competitors when it comes to converting these RFIs into sales.

Not only has it got thousands of operating hours under its belt, it also has engineers in place that can calculate the total cost of ownership savings a specific mine will achieve should they bring BEVs into their fleets. Due to the increase in upfront cost currently seen when comparing diesel- with battery-powered vehicles, this type of analysis is crucial to securing orders.

“We can show them how the machine will fit into the mining cycle and provide in-house calculations on ventilation and mine design savings,” Theunissen said. “This helps assist end users when it comes to long-term decision making for the mine.”

For countries in Africa to get on board the electrification train like those mines in Canada have, Theunissen thinks governments will need to introduce incentives for mines to change their energy inputs and adopt BEVs.

Should this happen, MacLean will be equipped both within the continent and internationally to take on that challenge.

AVZ readies infrastructure tenders for Manono lithium project

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AVZ Minerals has issued a raft of ‘pre-mining’ infrastructure package tenders for its Manono lithium-tin project in the Democratic Republic of the Congo.

The tenders, which will be awarded once AVZ makes a final investment decision on Manono, are estimated to be collectively worth about $300 million.

Included are the process plants engineering procurement and construction package, the Kabondo Dianda intermodal staging station, diesel storage facilities and supply package, site buildings and enterprise resource systems.

AVZ’s Managing Director, Nigel Ferguson, said: “We will have final pricings on our various tenders back in July and August and then expect to be in a position to award these contracts, pending COVID-19 travel restrictions being lifted and a financial investment decision being reached.”

The Manono project is owned by AVZ (60%), La Congolaise d’Exploitation Minière SA (30%) and Dathomir Mining Resources SARL (10%).

An April feasibility study highlighted a 20-year mine open-pit mine life producing 700,000 t/y of high-grade spodumene concentrate lithium and 45,375 t/y of primary lithium sulphate. Within this plan, the pre-production capital expenditure of $545.5 million included transport upgrade and rehabilitation of the Mpiana Mwanga Hydroelectric Power Plant.

Zest WEG signs up Panaco to grow footprint in key DRC mining hub

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Zest WEG, in an effort to strengthen its Africa footprint, has appointed Panaco as its value-added reseller (VAR) in the Katanga region of the Democratic Republic of Congo (DRC).

According to Zest WEG’s Africa Business Development Executive, Taylor Milan, Panaco is a 100% locally-owned business that has successfully serviced the region, known for mining, for over 40 years.

“Panaco is a well-established and respected company with strong business relationships with nearly all of our current clients,” Milan said. “Its business methodology and culture are closely aligned with ours, and this synergy will aid us in supporting our current installed base, client network and growth expectations.”

Milan highlighted the increasing importance of local content in the supply of equipment and services across the continent. Therefore, Zest WEG has prioritised closer partnerships with local firms as a key element of its sustainable growth strategy in Africa, a strategy Zest WEG Group CEO, Siegfried Kreutzfeld, mentioned shortly after being appointed to the role in 2019.

Milan also emphasised the importance of VARs in this strategy.

“Going beyond the role of just a distributor, a VAR is a local business chosen to promote and support the wide range of Zest WEG’s offering,” he said. “It carries the whole Zest WEG brand into local markets.

“Panaco has the ability to assist us in growing the comprehensive WEG product portfolio well beyond our traditional low-voltage motor and drive business,” he said. “It has business facilities in Lubumbashi, Kolwezi and Kinshasa – bringing our services and support closer to customers in this fast-growing region.”

The VAR partnership will provide locally accessible support and skills, substantial stockholding, and quality products at competitive pricing, the company said. It will also build strong and service-oriented customer relationships, according to Milan.

Zest WEG has also appointed DRC firm AEMI as a WEG-accredited repair facility, after AEMI successfully met its OEM standards. The company has a full repair facility in Likasi, and another in Kinshasa.

Zest WEG keeps DRC mining project on track in face of COVID-19 restrictions

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The Zest WEG Group, a subsidiary of leading Brazilian motor and controls manufacturer WEG, is intent on keeping its customers’ projects on track despite COVID-19-related travel restrictions and has devised a way to complete the final step in the manufacturing process remotely.

In an innovative first to keep a customer’s mining project in the Democratic Republic of the Congo on schedule, Zest WEG successfully conducted a remote witness test of medium voltage (MV) variable speed drives (VSDs) in WEG’s Brazil factory.

David Spohr, Business Development Executive for high-voltage equipment at South Africa-based Zest WEG, said these extraordinary times called for extraordinary measures.

“With the restrictions on international travel, we had to think creatively about how to complete this final step in the manufacturing process – the witnessed factory acceptance test (FAT) – before the equipment could be shipped to the DRC site,” he said.

Under normal circumstances, these tests would require the customer to travel to Brazil and spend a week at the factory witnessing and signing off a range of detailed test and equipment requirements.

This order comprised two 7 MW, 3,300 V WEG MVW01 VSDs for the ball and SAG mill drive application and two 1.2 MW, 3,300 V WEG MVW01 VSDs for the high pressure grinding roll (HPGR) mill application. Both applications required non-standard features, according to the company, namely “frozen charge protection” software on the ball and SAG mill application and a “master and follower” configuration on the HPGR mill application, it said.

Spohr said: “It was essential that we did not delay the customer’s project, so we arranged to conduct the witness test using web-based communication software. This allowed the participation of Zest WEG experts, the engineering contractor and the end user, all from the safety of their homes in Johannesburg – communicating with five testing technicians in the WEG factory in Brazil.”

Using a high-definition camera and web-based communication software, the factory technicians were able to walk the contractor and end user through each element of the FAT, with clear and real-time visual images of the test results and equipment on the factory floor, according to the company.

The tests continued for three days, beginning at 13:00 and ending at 19:00 to account for time zone differences. Testing covered three key areas – PLC communication software integration, full functional testing and full load testing, according to the company.

“As with any other witnessed FAT, the customer was provided with a comprehensive results report by WEG,” Spohr said. “This enabled the customer to check, in exactly the same way, that the remote FAT results were within the required tolerances.”

Spohr noted that this pioneering step is likely to influence the way these tests are done in future.
“It has shown that the testing can be done to the same standards, but with significant savings in time and cost,” he said.

Kibali automation journey to be discussed at SME Conference

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One of the most autonomous underground mines in the world, Barrick Gold’s Kibali operation in the Democratic Republic of the Congo (DRC) recently hit another annual production record.

The mine soared past its 2019 production guidance of 750,000 oz of gold, with 814,027 oz being delivered. This topped the previous 2018 record of 807,251 oz.

At this year’s SME MineXchange Annual Conference & Expo, in Phoenix, Arizona, on February 26, Ismali Traore, Kibali Technical Services Manager, is to reveal more about how the operation has continued to surpass expectations and how safety has become front and centre at the mine, owned 45% by Barrick, 45% by AngloGold Ashanti and 10% by SOKIMO.

In his conference abstract, Traore said, in recent years, the mine has made significant progress by implementing a fully automated production level and material handling system (MHS) at the underground mine.

This sees up to three LHDs operated simultaneously from ore passes to the crusher and multiple LHDs from the stope to the finger raises. The entire automation system is remotely operated from a control room located on surface.

In a recent presentation, the Kibali partners said the system was designed to have autonomous Sandvik LH621 LHDs work in combination with a Sanvdik AutoMine loading system (ALS). The ALS Mission Control System is incorporated with features such as traffic management, auto-loading and tipping with real time tonne-kilometres/h, and a real-time bucket weighing system that is within 3% accuracy level for each bucket trammed to the coarse ore bins (COB) at the operation.

The MHS, meanwhile, uses data obtained from the ALS to interface with SCADA via an OPC interface, according to the partners. COB levels from the SCADA system are then interfaced with ALS to manage the loading of the bins.

All information is interfaced to achieve the nameplate capacity of the hoisting system – which WorleyParsons provided the operating philosophy for and Winder Controls (member of the SIEMAG TECBERG Group) provided the winder design for – while taking into consideration the availability of the ALS to equate the total MHS availability, they said.

In its objective of becoming one of the most efficient Tier One mines globally where safety is a focal point of the operation, a significant amount of time was spent on the traffic management and human interaction with the autonomous mining equipment, Traore said.

This is something Barrick President and Chief Executive, Mark Bristow, picked up on last month, saying the mine is continuing its technological advance with the introduction of truck and drill training simulators and the integration of systems for personnel safety tracking and ventilation demand control.

Traore is to expand on the important safety protocols implemented to mitigate the risk of collision between this equipment and humans within the automated system during his presentation.

Barrick continues to adopt new technologies at Kibali gold mine

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Barrick Gold says its 45%-owned Kibali gold mine in the Democratic Republic of the Congo is continuing its technological advances with the introduction of truck and drill training simulators and the integration of systems for personnel safety tracking and ventilation on demand.

The mine, which is owned 45% by AngloGold Ashanti and 10% by SOKIMO, surpassed its 2019 guidance of 750,000 oz in 2019, delivering 814,027 oz in another record year, Barrick said this week.

Barrick President and Chief Executive, Mark Bristow, told a media briefing that Kibali’s continuing stellar performance was a demonstration of how a modern, Tier One gold mine could be developed and operated successfully in what is one of the world’s most remote and infrastructurally under-endowed regions.

He also noted that, in line with Barrick’s policy of employing, training and advancing locals, the mine was managed by a majority Congolese team, supported by a corps of majority Congolese supervisors and personnel.

Kibali is already one of the world’s most highly automated underground gold mines, with the operation’s backbone being Sandvik’s Automine Multi Fleet system, supervised on surface by a single operator. In a world first, it allows a fleet of up to five LHDs to be operated autonomously, 750 m below the surface, within the same 6 m x 6 m production drive while using designated passing bays to maintain traffic flow, the company says. A similar system is used in the production levels to feed the ore passes, according to Barrick.

The company said it had now introduced truck and drill training simulators and integrated systems for personnel safety tracking and ventilation demand control, adding that the simulators will also be used to train operators from Barrick’s Tanzanian mines.

Bristow also said that the company was maintaining a strong focus on energy efficiency at the mine through the development of its grid stabiliser project, scheduled for commissioning in the June quarter of 2020.

He said: “This uses new battery technology to offset the need for running diesel generators as a spinning reserve and ensures we maximise the use of renewable hydro power. The installation of three new elution diesel heaters will also help improve efficiencies and control power costs. It’s worth noting that our clean energy strategy not only achieves cost and efficiency benefits but also once again reduces Kibali’s environmental footprint.”

Bristow said despite the pace of production and the size and complexity of the mine, Kibali was maintaining its solid safety and environmental records, certified by ISO 45001 and ISO 14001 accreditations.

TLT-Turbo launches new range of ‘superfans’ for mine ventilation

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TLT-Turbo GmbH has redesigned its auxiliary and booster fan range to improve both efficiency and cost-effectiveness for ventilation applications in the mining industry.

The development of the new fan range concept began in early 2015, according to the company.

Following a global study to gain an understanding of the market requirements, the range was defined in mid-2017, with the fabrication of the first units taking place shortly thereafter, the global ventilation fans and systems manufacturer said.

Michael Minges, Technical Director at TLT-Turbo Africa, who headed up the fans’ designs, said: “The development of the auxiliary and booster fan range would not have been possible without the input of clients. This ensured that we focused on key market-driven requirements including energy efficiency, noise reduction, cost-effectiveness and turnaround time.

“To sell these products, we needed to ensure close customer relationships and visibility. We are striving to change the industry’s mindset on the use of such fans to ensure proper fan selection for the ventilation required. In optimising mine ventilation, efficient, high-quality auxiliary and booster fans can add as much value as surface fan installations.”

TLT-Turbo started commissioning of the first iterations of the fan range towards the end of 2017 within the Sub-Saharan market through its Africa office. From there, it based the development of the various fan sizes of the new range on market interest.

The fan range is being rolled out in phases. The preliminary testing at sites located in Sub-Saharan Africa has been launched successfully. The next phase is globalisation as the new range will be rolled out in the USA, Canada, Europe, Russia and Australia.

Following this, product supply and support will be extended to TLT-Turbo offices in South America and India. In the interim, though, Minges said these fans can be supplied to clients worldwide from TLT-Turbo Africa.

Minges said as energy efficiency is one of the main drivers of industrial equipment usage, and minimum efficiency requirements on certain equipment are often legislated, TLT-Turbo identified the need and opportunity in the market for “more efficient mining fans compared to what is currently in use”.

The new designs include several innovative additions to enhance performance in order to provide “exceptional” underground ventilation, the company said.

“The fan range was developed using the latest in engineering flow technology which allowed TLT-Turbo to improve the aerodynamics, and thus the efficiency of the fans. A unique stator design and aerodynamic fairings, all manufactured from wear-resistant composite materials, resulted in improved efficiencies and reduced noise levels.”

Meanwhile, the modularity of the fan casings allow for quick and easy assembly with interchangeable ancillary fan parts, according to the company.

“The motor mounting, in coherence with a machined impeller track, ensures low and controllable blade tip clearances for improved performance and efficiencies,” TLT-Turbo said. “Pad mount motors are used for all fan sizes and help reduce vibration levels in the axial direction of the motor significantly which leads to longer motor bearing life and lower maintenance requirements.”
Minges said all possible measures are taken to ensure the highest quality and best possible performance of every fan supplied by TLT-Turbo.

“All fans are ISO 5801 tested unless the client agrees to type testing on higher volume orders,” he said. “We ensure the client quoted performance is met before the fans leave the factory. Test certificates on both raw data and calculated performance can be provided on request.

“Fan efficiency is determined with the performance test and this quality check ensures we deliver on what we promised the client. Clients are regularly invited to witness the performance tests to sign off on acceptance. The fans also come with pressure ports that can be hooked up to a calibrated handheld measuring device to measure performance in-situ.”

In addition to performance and efficiency, ease of maintenance was also a major consideration in developing the new range.

The modularity of the product design and the interchangeable standardised parts allows for quick turnaround time on parts supply, according to the company.

“For example, we only have two blade types for the full product range and generally only one motor barrel per fan size accommodating various motor sizes and types,” Minges said.

“Standardisation on the product is the key to successfully managing maintenance and repair as it allows ample supply of spares for companies certified to do the repair work. The design track record has indicated a longer mean time between failures than previous products.”

TLT-Turbo Africa has received a number of orders for these fans since the end of 2017. These orders include South Africa clients seeking a solution for deepening a gold mine and for Kamoa Copper in the DRC as an exclusive supplier.

Minges said: “The feedback that we have received, thus far, has been that the fans are meeting our and our client’s expectations. I am proud to say that one EPC consultant used the phrase ‘superfan’ to describe the new range and indicated that he has not heard a fan of this size so quiet before.”