SciDev’s MaxiFlox® chemistries are to be used in the tailings thickener at the Las Bambas copper mine, in Peru, following a trial purchase order from mine owner MMG.
The commercial trial follows on from earlier successful technical evaluations that SciDev conducted during 2019, it said.
The aim of the trial is to improve water recovery and, ultimately, increase the available volume in the mines tailings storage facility, according to SciDev.
SciDev Managing Director and CEO, Lewis Utting, said: “The order from MMG Ltd at their Las Bambas operation represents SciDev’s first entry into the copper sector in South America. With both water and available land at a premium in the region, SciDev’s technology could add value to our customers.”
MaxiFlox is specifically designed for use in solid liquid separation processes, SciDev says. Products in the MaxiFlox range are supplied in both liquid and powder form across an extensive range of molecular weights and charge densities to solve industrial challenges. Products include:
MaxiFlox organic liquid coagulants (based on synthetic organic monomers and naturally occurring polysaccharides);
MaxiFlox inorganic liquid coagulant blends;
MaxiFlox cationic and anionic flocculant emulsions;
The Mining Peru Congress is now less than three months away and the organisers are ready to welcome more than 300 attendees from key mining enterprises, regulatory authorities, government, technology and equipment suppliers, and investors.
Taking place on April 1-2, in Lima, Peru, Vostock Capital, the organisers, describe the event as a “strategic congress and exhibition for the leaders of the mining industry”.
Vostock says the conference highlights include:
New concessions and projects: learn about the conditions for individuals or corporations to acquire mining concessions during the next public tender process;
Technology, safety and productivity: learn how innovative technologies in exploration and mine development are helping mining companies increase their productivity;
Funding and investments: cooperating with local and international banks and financial institutions, private investors, project financing. How to gain the most favourable lending conditions and how to ensure a quick return of investments;
Beyond licensing: the benefits of mining in a socially and environmentally responsible manner;
Where’s Peru heading? Obtain the most up to date insights into key projects and opportunities;
Dedicated exhibition of cutting-edge equipment and technologies for the mining industry delivered by local and global leaders from around the world;
One-to-one business meetings and networking opportunities: talk to key decision makers, develop new business contacts, take part in networking round tables, cocktail reception and interactive discussions.
TOMRA Sorting Mining says Peru’s Minsur SA has felt the benefit of its X-ray Transmission (XRT) sensor-based ore sorting technology, with its San Rafael tin mine having seen an increase in reserves, plant capacity, overall recoveries and mine life since it was introduced.
Part of the Breca Group of companies, Minsur owns and operates the largest underground tin mining operation in the world, San Rafael. Located in the Eastern Mountain chain of the Andes in Peru at an altitude of 4,500-5,200 m above sea level, the mine contributed about 6% of the total world production of tin in 2015, with about 1 Mt of ore at an average grade of 2.13% mined and processed, resulting in 20,000 t of tin concentrate.
That same year, Minsur initiated a number of activities to ensure the future value of its asset, addressing challenges that included declining head grades and rising operating costs, according to TOMRA.
One of these activities involved an ore sorting project.
Started in 2015, in collaboration with TOMRA Sorting Mining, the project’s objective was to reject low-grade material in coarse particle size.
“By separating sub-economic material before entering the more cost-intensive wet processing, the project would address the bottleneck at the wet section and improve productivity by increasing the feed grade,” TOMRA explained. An added benefit expected from the project would be the longer life of the mine.
Three main factors indicated that sensor-based particle sorting for waste rejection would be effective at San Rafael:
The high absorption of transmitting X-rays of tin contained in cassiterite;
The structures of cassiterite, which are large enough to be detected by XRT technology; and
The significant degree of liberation of sub-economic waste on the particle level that may be subject to sensor-based particle sorting.
In order to assess the feasibility of the project, TOMRA conducted metallurgical tests on geological samples from San Rafael, followed by performance test work. The tests showed the deposit to be amenable to XRT ore sorting due to the presence of 70-80% of uneconomic particles that can be rejected over a wide size range, from 6 to 70 mm, TOMRA said.
The project was approved and, in view of the significant economic potential, was fast tracked and completed in just 14 months. TOMRA and its partner in Peru, which supplied and installed the XRT sorting system, worked closely with Minsur throughout the six-month ramp-up period.
The ore sorting project with TOMRA’s XRT system has delivered significant financial benefits from the beginning, with Minsur realising payback on its capital expenditure in just four months, according to TOMRA. In 2017, the ore sorting project contributed around 36% of Minsur’s total production with about 6,000 t of tin concentrate, the company said.
The project has reduced capital and operating costs at San Rafael in a number of ways:
Added value – TOMRA’s XRT sensor-based ore sorting is converting uneconomic waste material into economic ore, as material below the cutoff for the main plant can be treated with lower operating costs and converted into reserves;
Increased plant capacity – The main plant capacity has gone from 2,950 t/d before implementation to 3,200 t/d today, as a result of the crushing operation at the XRT sorting plant;
Significant improvement in the overall recovery in the main plant – from 90.5% to 92.5%. This is due to sensor-based ore sorting rejecting particles with very fine mineralised cassiterite that is too small for detection by the XRT system, resulting in higher grade and size of mineralisation;
Extended life-of-mine – today, about 24% of the feed to the sensor-based ore sorting plant come from low grade ore from underground, which in the past would have been below the cutoff. This increase in reserves significantly extends the life of mine;
Elimination of liabilities through the treatment and proper disposal of 100% of the stockpile; and
Decreased tailings disposal due to the sensor-based ore sorting system reducing the amount of waste by increasing the grade in the feed to the plant.
TOMRA concluded on the San Rafael case study: “The success of the project has demonstrated the high potential of TOMRA’s XRT technology, and as a result, the company plans to include XRT sensor-based ore sorting as a possible process route in all future projects.”
Minnovare has signed on Lima-based Core Tech as its official sales and support agent for the Azimuth Aligner® product throughout Peru.
Used in mining exploration and civil construction, the Azimuth Aligner automates the drill-rig alignment process – substantially increasing accuracy and efficiency, while reducing downtime and costs by up to 90%, according to Minnovare. It has previously been tested out at LKAB’s Kiruna mine, among other operations.
Established in 1996, Core Tech offers solutions for mining exploration, surface mining, underground mining and construction, providing customers with the best products, brands, services and prices in the region, Minnovare said.
Minnovare Commercial Director, Mick Beilby, said: “We’re very pleased to be able to sign this distributor agreement with Core Tech. Core Tech have built a solid reputation in the Latin American mining sector over the past 20 years. Their cultural fit aligns well with Minnovare’s and we look forward to collaborating with them in the years to come.”
The screens and feeder contract will see all design completed at Schenck’s vibrating equipment design centre in Sydney, Australia, manufacture and testing in the company’s Chinese plant, custom-made screen panels from the South Africa production facility and commissioning by the aftermarket services team in Chile. The project is being managed and coordinated by the Australia-based Project Management team, Schenck said.
The screens include several mechanical and operational improvements developed on a prototype vibrating screen now undergoing site testing at an iron ore mine in Western Australia, according to the company.
“The five larger screens feature laminated side plates to maintain structural integrity and reduce stress concentrations associated with the projected process tonnages,” Schenck explained. “Additionally, machined transition flanges are welded in a low stress area to the cross beams to actively reduce fatigue, and a unique spring removal system has been fitted to facilitate and reduce downtime during spring change-outs.”
The six feeders have been designed to account for site conditions and feature a more robust design. They are also equipped with exchangeable liners and an upgraded transition hopper to improve operational availability and performance, the company said.
Each of the vibrating feeders and screens for Mina Justa is equipped with CONiQ, the company’s proprietary continuous six-dimension condition monitoring system, to track and alert operators to abnormal operating conditions. Feeder control systems have been electronically aligned with the screen’s installation, Schenck added.
Project manager, Lauren Williams, said: “This is a truly international project and, from our point of view, it is the best way to give our customer the equipment that will deliver higher process efficiency and longer service life.
“Although based on standardised platform designs for screens and feeders, each unit has been subject to a customising process to meet site and processing capacity requirements. We are delivering an integrated package of screens and feeders to optimise availability and productivity and represent the best value for money.”
“It’s clear that the pressures on us are unsustainable, whether it is around our carbon footprint, water footprint, or physical footprint, and we are always looking for different ways to push us in this future direction where our footprint will be very different.”
Tony O’Neill, Anglo American Technical Director, knows the company he works for is up against it when it comes to retaining its reputation as one of the world’s leading sustainable mining companies.
It’s clear from the company’s 2018 sustainability report – which saw it achieve a best-ever performance in terms of injuries, a cut in energy use and an increase in greenhouse gas emission savings – that Anglo is going down multiple paths to reach its goals. O’Neill, who joined the company almost six years ago, believes Anglo’s FutureSmart Mining™ programme will play a major role in confronting and overcoming many of the issues it (and the industry) is facing.
“If you look at FutureSmart Mining, at its absolute essence, it is about footprint; how do you change the footprint of mining? How do you have a mine that draws no fresh water? Mines without tailings dams? Mines that look very different?” he told IM.
“It’s getting people to believe there is a different way for mining in an industry that has, to this point, been quite traditional. It is not going to happen overnight, but I think we have a genuine vision that is, in my view, quite feasible.”
IMspoke with O’Neill and Donovan Waller, Group Head of Technology Development, this week to get to the bottom of how technology is making Anglo ever more sustainable.
IM: Could you explain how the Anglo operating model facilitates and fosters innovation within the context of FutureSmart Mining?
TO: The Anglo American operating model is the chassis that underpins everything, giving us certainty in the delivery of our work. When you have got that stability – and the lack of variability – in your business outputs, it is much easier to overlay new technologies and processes. When you then see a difference in operating or financial results, you can confirm it is down to what you have implemented, rather than the underlying processes.
I look at it a little bit like a three-legged stool: you have the operating model on one leg, the P101 benchmark-setting on another, and technology and data analytics on the third leg. They all co-exist in this system and work off each other. Without one, the stool falls over.
The operating model has given us a drumbeat of delivery, and we get the licence to innovate because of this drumbeat.
IM: Do you think FutureSmart Mining is starting to be understood and valued by investors?
TO: They’re awake to it now. I think it is still in the early stages of the story, but they can see what we are doing and the ambition behind it. Ultimately, it will result in a different investment profile, or more investors because of it, but I am not sure that it’s translated in full up to now. The recognition has been more around the general results of the company.
With all these technologies coming through – much of them driven by higher levels of data and the ability to interrogate that data – the vision we imagined way out into the future, I think, is a lot more tangible than when we started out four years ago.
IM: Out of all the tailings dam elimination work you are carrying out (around passive resistivity, fibre-optics, micro-seismic monitoring, coarse particle recovery, polymers, and dry stacking), which innovation will have an impact on Anglo’s operations in the next three-to-five years?
TO: All of them. We started out with our tailings programme in 2013; in fact, our group technical standards were re-issued at the beginning of 2014 and they are now one of the main guidelines the ICMM (International Council on Mining and Metals) uses.
Tailings dams have always been at the back end of the mining process and, in a way, the science behind them has never been part of the mainstream operation. Our view, internally for many years, is tailings dams are one of the industry’s greatest risks.
Ultimately our aim is to eliminate tailings dams. Period. Coarse particle flotation – getting that coarser particle size that drains much more freely – is core to that and you can see a development pathway there. For example, with some of these new flotation techniques, we now only need 1% exposure of the mineral for it to be effective. In the past, it was much higher.
When we upgraded the capability of our tailings organisation, it became clear we needed to get a lot more data off these tailings dams. About three years ago, we started putting fibre-optic sensors into the dams. We have since developed, through our exploration arm, passive resistivity seismic monitoring, which basically tells you where your water sits in the dams. And, we’re putting into Quellaveco micro-seismic measuring techniques, which will be more granular again. You can see the day coming really quickly where tailings dams are a real-time data source for mining companies.
We’re also, with our joint venture partner Debswana, building the first polymer plant in Botswana, which could have an impact on dry tailing disposal.
The thing we need to crack – both ourselves and the industry – is how to dry stack at scale. At the moment, that is still a work-in-progress, but it is doable in the long term.
TO: With the bulk sorter, we’re taking packages of tonnes rather than individual rocks to enable us to get both speed and volume. At El Soldado, we are sorting in four tonne packages. You can adapt the sorting profile by the characteristics of the orebody. We’re generally looking to sort tonnages that are less than you would put in a haul truck body or bucket.
If you step right back, in the past, most processing plants wanted to blend to get an average feed. We are going the other way. We want to use the heterogeneity of the orebody to its advantage; the less mixing we can get ahead of these sorting processes, the better it is for recoveries.
Being able to remove an orebody above the cut-off grade alongside waste tonnages and upgrade the latter has led to an effective lift in head grade. It has been enabled by new sensing technology with a particular type of neutron sensor.
What we have seen in early results has surprised us on the upside. We thought we would see a 5% uplift in head grade, but in fact we have seen about 20% – to qualify that, it’s in its early stages.
If you take this to its logical conclusion, you can see the day coming where you would cut the rock – no drilling and blasting – immediately sort the rock behind the machine cutting it and distribute said rock efficiently into its value in use; you don’t have stockpiles, you have plants sensing the material right through and adapting in real time to the change in mineralogy. I think there is another 3-4% increase in recovery in that whole process when we get it right.
Our sweet spot when we created FutureSmart Mining was always the orebody and processing plants, more so than automation (although that is part of the potential mix). That was different to a lot of the other players in the industry. This focus could lead to the development of different types of plants; ones that are flexible, more modular and you can plug and play.
IM: Do you see these type of neutron sensors being applied elsewhere across a mine site?
TO: Yes, through processing plants and conveyors. In fact, we’re preparing for this on conveyors right now.
What we have found with all this new technology is that, when we implement it, quite often another opportunity arrives. They end up playing off each other, and that is the context for the bulk sorting and coarse particle flotation.
IM: How have Anglo’s Open Forums played into these developments?
TO: We have held eight Open Forums on sustainability, processing, mining, exploration (two), future of work, energy and maintenance.
Out of those eight, I think we have got around 10,000 ideas from them. These forums have been specifically designed where only about a third of participants are from the mining industry, with the other two thirds coming from the best and brightest analogous industries we can tap into – automobile, oil & gas, food, construction, even Formula 1 racing and NASA.
The reality is that out of those 10,000 ideas, the success rate is about 1:1,000, but the one that makes it is quite often a game changer.
IM: Going back to the bulk sorters, am I right in thinking you plan to put these into Mogalakwena and Barro Alto too?
TO: The aim is to have them across our business. At El Soldado, the copper angle is very important. The technology – the sensing and using the data – is probably a touch more advanced in copper, but we are building one currently in our PGMs business at Mogalakwena and a bit behind that, but ready to be built, is one in nickel, yes.
In terms of our programme, you will see them spread across our business in the next, hopefully, 18 months.
IM: Where does your approach to advanced process control (APC) fit into the FutureSmart Mining platform?
TO: We want to have APC in some form across all our business by the end of this year. We have probably come from a little behind some of the other players in the industry, but we’re pushing it quite aggressively to give us the platform for data analytics. The upside we have seen just by putting the process control in so far has surprised me a bit – in a good way; power reductions, throughput, having this different level of control. All of it has been pleasing.
We spent about 12 months looking at the whole data analytics space to see how we were going to implement our solution. If you look around at the sector, everyone wants to be involved and profit share. If you add it all up, you could end up with not a lot of profitable pieces at the end. We have strategically chosen the pieces we think are important to us and our profit pool and have been happy to be a little looser on some of the non-core areas.
The other key plank to the APC is that we own the data. The reality is, in the new world, data is like a new orebody and we’re not willing to let go of that.
TO: Initially, we couldn’t make renewables work from an investment criteria perspective – it was always close, but never quite there. Donovan’s team then took an approach where they said, ‘forget the normal investment criteria. All we want to do is, make the business case wash its face.’ In doing so, it enabled them to oversize a renewable or photovoltaic energy source – the power plant – using that extra power to produce hydrogen and putting that hydrogen to use in the haulage fleet. Re-engineering the haulage fleet gave us the business outcomes we were looking for.
DW: These business cases bring you to temporary barriers. When you hit that temporary barrier, people normally stop, but what we said was, ‘OK, just assume it is not there and go forward.’ That brought the whole business case back again by looking at it differently again.
IM: Where is this project likely to be situated within the group?
TO: We’re still not 100% fixed as the initial work will be done here (the UK). You are talking about quite specialist skills working with hydrogen.
When the system has gone past its initial testing, it will go to a site, probably in South Africa, but we are not 100% locked into that at this point.
IM: On the 12-month timeline you have given, when would you have to be on site?
TO: The infrastructure will be pre-built here in the UK. We’re effectively testing it here. In a way, the physical truck is the easy bit.
It’s going to be using a 300-t class truck. The guys have already done quite a bit of the detailed measuring and the design elements are well under way.
We’ve also taken the approach to use pre-approved technology, which Donovan can talk about.
DW: This minimises the risk on the first go and allows us to, later, tailor it. For example, if you don’t have a right sized fuel cell currently available off-the-shelf, you just use multiple standard-size fuel cells for now. Then, when you get into the final version you could tailor them into something more specific.
IM: On mechanised cutting, you recently mentioned the building of a “production-sized machine” for at least one of your mines in South Africa. Is this a variant of the Epiroc machine – the Rapid Mine Development System – you have been using at Twickenham?
TO: It’s the next generation of machines. It’s fair to say that, in the last 12 months, the technology has come to the point where we are confident it is viable.
What we’re looking for is a fundamental breakthrough where, for example, we can take the development rates up three or four times from what you would usually expect. That is what we’re chasing. It would involve some sort of pre-conditioning of the rock ahead of the cutting, but the cutting, itself, works.
For us, mechanised cutting is a real solution to some of the safety issues we have had on our plate. Regardless of whether it goes into South Africa or another underground mine, we see it as a key part of our future underground design and operation.
IM: What type of rock pre-conditioning is this likely to be?
TO: I think around the world, people are looking at electricity, microwave, laser, a whole suite of things. None of them have yet quite landed, but they all have potential.
IM: Where does haul truck automation fit into the pipeline for Anglo American?
TO: All the equipment we buy, going forward, will be autonomous-capable, which means we can run it in either format (manned or unmanned). You are then left with a number of decisions – have you got the design to retrofit automation? Is there a safety issue to be considered? Is there a weather issue to contend with? There are a whole series of gates that we’ll take it (automation projects) through.
It’s good to go back to P101 here. Where P100 is getting all of our key processes to world-class benchmarks, P101 is about establishing a new benchmark. By definition, if you get your operations to that point, the gap between that manned performance and autonomous performance is not that great.
GIW Industries says it is to deliver four MDX 600 cyclone feed pumps to Anglo American’s Quellaveco copper project in Peru.
GIW, a subsidiary of KSB, won the order based on the reputation of its centrifugal slurry pumps and the firm’s commitment to customer support, it said. “Decades of experience in slurry transport means GIW is in the perfect position to partner with Quellaveco.”
Anglo American plans on first copper production coming out of Quellaveco in 2022, which, with a reserve of 1,300 Mt at 0.58% Cu, is expected to have a 30-year mine life at an average production capacity of 127,500 t/d. This could see the mine produce around 300,000 t/y of copper.
The Quellaveco project marks a significant milestone for GIW as it continues to invest in the region, the company said. In 2018, it expanded its service capabilities in South America to meet the needs of current and future customers.
Local GIW technicians will be on-site to assist Quellaveco for the installation, commissioning, and start-up of the four MDX 600 cyclone feed pumps, according to the company.
“The MDX pump was selected for the Quellaveco project because of its success in copper and gold applications around the world,” GIW said. “The MDX product line has undergone extensive development; in fact, the latest technology features a remotely adjusted mechanical suction liner.
“The pumps for Quellaveco are specially designed to operate in the most extreme duty conditions. Critical wear parts are made of GIW’s proprietary white-iron alloy, Endurasite. This material extends wear life and optimises pump performance.
“These features combined have a direct impact on Quellaveco’s total cost of ownership – proving the MDX is the most reliable pump on the market.”
Hernan Palavecino, South America Region Manager for GIW, said economic stability and continuous growth in the country have facilitated the investment of new mining projects in Peru, with the country, over recent years, becoming a key player in the global market.
“GIW recognises the importance of the Quellaveco mine to the region,” he said. “The greenfield project solidifies Peru’s position as a substantial player in the South American and global mining markets. The award is a result of GIW’s drive for continuous improvements in slurry technologies. We are committed to offering high-quality service while building a long-term partnership with Quellaveco.”
Having just commercialised its bulk ore sorting technology at Teck Resources’ Highland Valley Copper (HVC) operations in British Columbia, Canada, MineSense is looking to show the wider industry just how effective this pre-concentration process can be.
IM spoke with President and CEO, Jeff More, to find out more about the company’s ShovelSense and BeltSense technologies and how the Vancouver-based startup has been able to secure investment from the likes of ABB, Caterpillar and Mitsubishi.
IM: Can you explain in a little more detail how your ShovelSense and BeltSense solutions work?
JM: The base technology for both is X-ray Fluorescence (XRF) – a technology that has been around for some time. What we have done to this existing technology, which is quite unique, is three things:
One, we have extended dramatically the range of XRF. Traditionally XRF would almost have to be held to the surface of a rock to get accurate measurements. The range extension allows us to work in the shovel environment where we are working across metres of volume;
Second is speed. Our system is extremely fast. High speed analysis is required on our conveyor belt applications, but this is even more important in the shovel, where we’re measuring dynamically; as the material is flowing into the shovel, to get a representative reading, you have to be able to take very fast readings of the material as it is moving past the sensors;
The third is robustness. On a shovel, you are in a nasty environment from a shock and vibration perspective. We developed a system with sensitive components – the XRF itself, as well as the computing devices around it – that can stand up to that very high shock- and vibration-type environment.
IM: The most high-profile examples of the application of your ShovelSense technology have been at copper mines (HVC, in particular); is the detection technology particularly effective in these ores? Is it being trialled elsewhere?
JM: The current sensing we have with the XRF is very effective in a certain section of the periodic table, which nicely covers the major base metals. We’re focused on copper, nickel, zinc and polymetallic versions of those three. The fourth area of focus is iron ore.
We’ve selected copper as our first focus because of the size of the market and the geography. We have done most of our work in copper, but we now also have operating systems in nickel and zinc.
On a lab scale, the technology has been very effective in iron ore, but iron ore is a very different flow sheet, so we have purposely set it as our fourth market in what we call our primary clusters.
We have five mine site customers at the moment – three copper, one zinc-lead and one nickel-polymetallic.
We were very much focused on North America and, in particular, British Columbia for our first pilots and trials as it was quite easy for us to service in our back yard. The first international market was Chile, for obvious reasons in terms of copper production, and we now have a full MineSense entity and team operating in Chile and Peru.
We’re staggering the rest of our global expansion. We’re now quite active from a business development perspective in southern Africa – South Africa, Zambia, DRC – and have activity in Australia.
We have Systems installed at two different copper mines in British Columbia, one at a very large nickel-polymetallic complex in Sudbury, Ontario, and will have a fourth system operating in Alaska. We also have two mines, but four systems, operating in Chile. By the end of Q2, we will have another three systems operating in Chile.
We did all our development work for the system at Teck’s HVC operation and we’re now completely commercial there. We officially commissioned our first system in December, the second system is being commissioned as we speak and the third and fourth will be installed and commissioned in late-March. This will completely equip their fleet.
IM: Teck has previously said the use of ShovelSense has resulted in “a net measurable increase in the amount of ore (and the associated head grade)” it has available to feed its mill at HVC. Are these results in keeping with your expectations for the technology?
JM: Yes, absolutely. We base everything on, what we call, our value model. Very early in our engagement process, we set out a detailed model that calculates the profit improvement that mine will see – we did the same for Teck HVC.
We agreed on a target at HVC and are actually exceeding that estimate. Most importantly, Teck is also seeing that value and is estimating a great overall impact at that mine.
This is an abridged version of a Q&A to be published in the ore sorting feature in the March issue of International Mining.
Epiroc has been awarded a “significant” order from Anglo American for its new copper mine in Moquegua, Peru, Quellaveco.
The diversified miner has ordered multiple drill rigs and related equipment to be used at the planned open-pit copper mine as it looks to build an operation with optimal safety, productivity and efficiency, Epiroc said.
The order totals about $44 million, with most of the contracted value booked in the December quarter of 2018 and a smaller portion booked in the current quarter, Epiroc said.
Helena Hedblom, Epiroc’s Senior Executive Vice President Mining and Infrastructure, said: “We are proud to once again team up with Anglo American and play a key role in making sure that its new mine in Peru is operated in the most productive, safe and cost-efficient manner possible.”
The order includes Pit Viper 351 and SmartROC D65 drill rigs, BenchREMOTE remote operator stations (pictured), rock drilling tools and HB 10000 hydraulic breakers.
“The machines incorporate state-of-the-art technology features,” Epiroc said, adding that operators are, for example, able to run rigs remotely from a safe distance.
Delivery of the machines will start in early 2020 and continue through 2021, in line with Anglo American’s plan of first copper production during 2022.
Tahoe Resources has reported what appears to be attempted theft at its La Arena gold mine after discovering five “significant” holes cut into the top of the pregnant solution pipeline at the operation in La Libertad, Peru.
The cuts on the pipeline that transfers solution from leach pad 4B to the pregnant solution pond caused discharge of solution from the pipeline into a storm water collection pond designed to discharge clean water into the nearby Sayapampa Creek, which runs through part of the property.
Tahoe said: “Based on a preliminary internal investigation, the company believes that in an apparent theft attempt, holes were cut into the top of the pipeline in order to place bags of carbon inside of the pipeline to absorb gold from the solution. One of the bags of carbon blocked the pipeline and the solution sprayed from the hole onto the top of the raincoat sitting above the pipeline.”
Subsequently, the solution flowed across the raincoat into the storm water collection pond.
The company’s initial investigation estimates around 600 cu.m of pregnant solution may have flowed into the Sayapampa Creek via the storm water management system.
“Upon identification of the discharge, the company immediately initiated our emergency response protocols including conducting extensive inspections of the surrounding areas from the operation and assessing the potential impacts to the communities and environment downstream,” Tahoe said.
Tahoe reported the incident to the Agency for Environmental Assessment and Control (OEFA), the Ministry of Energy and Mines, the police, the public prosecutor and surrounding communities. The police and OEFA were both expected on site on August 29 to conduct investigations.
“Given that the impacted pipeline is a gravity-flow line and the holes are at the top of the pipeline, the company is able to safely maintain solution flow from pad 4B without leakage into the storm water management system now that the obstruction has been removed,” Tahoe said.
“The company expects that the damage to the raincoat and pipeline will be repaired over the next several days, once all relevant authorities have conducted their initial investigations. Equally important, the company is already in the process of addressing the contamination to the storm water management system. As a result, the company does not anticipate a material impact to production at this time.”
A full internal investigation and review of security procedures will be conducted in order to avoid and prevent future incidents, Tahoe said.
The La Arena heap leach operation was previously slated to produce 160,000-185,000 oz of gold in 2018 at all-in sustaining costs of $950-1,050/oz.