Monday, 31 March 2025

Sunday in Cape Town

Sunday 30th March

The Vineyard Hotel has been filling up over the weekend with delegates from 28 countries arriving for tomorrow's Comminution '25

Delegates from Germany and Sweden relaxing on the Vineyard terrace

There was much pre-conference activity today. Our industry advocate, CEEC: Coalition for Minerals Efficiency, ran a whole day workshop, The Future of Comminution, sponsored by Metso, which was well attended by 57 delegates.

This was followed by a short course  the capability and application of the Isamill from GlencoreTechnology. The course, attended by 34 delegates, celebrated the 30th birthday of the IsaMill, which has led the way in energy efficient ultra-fine grinding since its development in the early 1990s, and I was pleased to be invited to cut the celebratory cake!
Cutting the IsaMill cake with Glencore's Cedric Walstra, , Hans De Waal, Ion Gurnett and Kai Johnston

And then in the late afternoon the welcome reception for Comminution '25 got underway, a great way to start the week and meet the 28 exhibitors.

Friday, 28 March 2025

March summary: Trump, Ukrainian minerals and WFH

At the end of last month I was in Denver for MINEXCHANGE 2025. Now I am in Cape Town, for Comminution '25. In between. much has happened.

The beginning of the month was dominated by the shameless bullying in the Oval Office of President Zelensky of Ukraine by President Donald Trump and his sycophantic Vice-President JD Vance. In front of the world's media Trump and Vance ganged up on the man who has led three years of war effort, his crime, according to Vance, being that he had not said thank you enough, despite having endlessly thanked allies for their support. Declaring that this was good TV, Trump then had the brave Zelensky ejected from the White House like one of the contestants from the TV reality show The Apprentice, which Trump hosted for the first 14 seasons. At the start of the war, Zelensky stayed in Kyiv when Russian forces were closing in and the city was under bombardment. Tough guy Vance, by contrast, chose to move to a secure location when confronted with a few protesters on a skiing trip the day after the White House confrontation.

Four days after the disgraceful episode the deplorable Trump paused all military aid to Ukraine, leaving the West vulnerable to Putin's potential advances. The suspension of American military aid, and also intelligence, was one of the worst setbacks for Ukraine since the start of the full-scale invasion, and a huge boost to Russia's chances.

Two weeks later, after a USA-Ukraine summit in Saudi Arabia, Trump reversed his decision and allowed military aid and intelligence to resume. The original White House meeting was supposed to announce an agreement under which Ukraine would provide US companies with access to critical minerals deposits in exchange for military aid. In describing the proposed deal, Trump quickly zeroed in on the rare earths, for which the US has for years been spending billions of dollars in an attempt to secure stable supplies. China dominates production of numerous critical metals and minerals, but none so completely as the rare earths, a group of 17 elements that aren’t actually that rare but are extremely difficult and expensive to extract and separate. 

The real challenge with rare earths is in their processing, which is a complex, energy-intensive process, using mainly fossil fuels and causing much pollution, occasionally producing radioactive waste. More than 95% of industrially useful rare-earth metals are produced by China, and whole communities have been affected by the processing and the waste produced. Hidden out of sight behind smoke-shrouded factory complexes lie vast, hissing cauldrons of chemicals in tailings lakes that are often very poorly constructed and maintained. Throughout the extraction process large amounts of highly toxic acids, heavy metals and other chemicals are emitted into the air that people breathe, and leak into surface and ground water.

However there are no deposits of rare-earth ore in Ukraine known to be mineable in an economically viable way, and that would be true even if full-scale warfare were not raging in the country’s east, where a great deal of its mineral resources are concentrated. It would take years to get projects off the ground, possibly much more than a decade.   

Ukraine does have other valuable commodities that are not rare earth elements but the US still identifies as critical, such as graphite and titanium.  Ukraine has some of Europe’s largest deposits of critical minerals, including lithium and titanium, much of which is untapped so that turning Ukraine's reserves of lithium and other critical minerals  into operating mines and constructing processing facilities is a mammoth undertaking, and companies would have to invest huge sums, likely a billion dollars or more, to develop critical minerals and rare-earths mines in Ukraine. 

Ukraine's mineral resources haven't been mapped since the Soviet era but it could be the largest lithium resource in Europe and Ukraine's reserves of graphite, a key component in electric vehicle batteries and nuclear reactors, are estimated to represent 20% of global resources. 

But it is unclear what kind of security guarantees companies would require to risk working in Ukraine, even in the event of a ceasefire. And no one knows for sure what kind of financing agreements would underpin contracts between Ukraine and US companies. Mining also requires a robust electricity infrastructure and it is not really a competitor given the state of the country's infrastructure and being a huge security risk. A phone call between Trump and Putin on the 18th of the month led to an agreed 30 day halt to strikes on Ukraine energy targets but immediately after the call mutual strikes on Ukrainian and Russian infrastructure targets continued. The end to this war is a long way off.

Trump's imposition of universal tariffs is also causing much concern, with worldwide condemnation, and the UK is pushing for a trade deal with the US as tariffs imposed on imports of steel and aluminium take effect.The tariffs mean US businesses wanting to bring steel and aluminium into the country will have to pay a 25% tax on them. Trump hopes the tariffs will boost US steel and aluminium production, but critics say it will raise prices for US consumers and dent economic growth. Critical metals such as nickel, cobalt, and platinum-group elements are also indispensable to the US economy, yet the country is overwhelmingly reliant on imports, often from nations it is now targeting with trade restrictions and US markets sunk mid-month in response to recession fears.

I feel for my American friends at the collapse of respect for their country since the narcissistic Trump ascended the throne. It is telling that the Financial Times reports a record number of Americans applying for British citizenship! 

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Due to atrocious weather Barbara and I missed the last day of the International Mining Games which were held last weekend at the King Edward Mine (KEM) museum in Camborne. The Games were first held at KEM in 2012 and 2018 when teams from Australia, Brazil, USA and Europe were welcomed.

The Camborne School of Mines team competing in the games in 2018

This year there were teams from Australia (WA, Queensland, NSW), USA (Missouri, Arizona, Montana, Nevada, Colorado, South Dakota), Canada (British Columbia), Germany (Freiberg, Bochum).  Belgium (Mons) also sent students to volunteer and learn for future participation. There were many local Cornish teams including four from Camborne School of Mines and KEM's own young team of volunteers.  Many congratulations to the Camborne School of Mines, the winners of both the men's and women's competitions.

The primary aim of the competition is to keep the "old-fashioned" mining techniques alive, many of which were developed in Cornwall. In many villages in the 20th century, men could be seem competing in hand-steeling competitions, as in the photo below, taken at KEM in 1910.

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Changing the subject completely, what are your views on working from home (WFH)? The Covid pandemic forced office workers to work from home, and this became an accepted new way of life for many. But after the pandemic the Conservative government set an expectation that civil servants spend at least 60% of their working week at a government building or on official business. The Labour government has maintained this expectation due to the “clear benefits of face-to-face working”. 

However, some civil servants have raised concerns about the 60% office attendance mandate. A recent report from the FDA,the trade union representing professionals and managers in public service, showed that 78% of respondents believe the 60% mandate overall has not been beneficial, failing to deliver on any of its own objectives to boost productivity, improve collaboration, and help younger workers.

I have been WFH now for 29 years, and love it. Amanda and Jon, my MEI partners, also thrive on WFH, devoid of rigid 9 to 5 hours of working and long journeys to and from an office.

I live in Falmouth and work each morning until lunch time, after which I walk the coastal path or cycle. Amanda lives 4 miles away in the little village of Mabe, and works in between gig-rowing, walking her two dogs and looking after her two sons, who live at home. She is a great traveller and finds time to work even in remote locations.

Jon lives in Luxembourg. his partner Kathryn working at the Luxembourg Institute of Science and Technology.  Jon works when he is not taking the children to and from school, cycling or presenting his weekly 15 minute music update on ARA City Radio Luxembourg. So successful has this been that this month he began a fortnightly 3-hour slot, talking about and playing music.

WFH works very well for us, and we keep in touch daily via email and WhatsApp. It would be good to hear of your experiences with WFH.

But we don't work totally from home of course. Barbara and I are now at the Vineyard Hotel in Cape Town. Jon and Amanda join us tomorrow in time to welcome delegates to Comminution '25 on Sunday. There will be daily updates on the blog next week.

Arriving in Cape Town 2 hours ago

Monday, 24 March 2025

Comminution '25 is only a week away

MEI's 14th international comminution symposium, Comminution '25, begins next Monday at the Vineyard Hotel in Cape Town and it's not too late to register and join the 220+ delegates from 28 countries to learn about the latest developments in comminution from the 65 technical presentations and 30 poster presentations, which include three high profile keynote lectures.  There are also two associated workshops next Sunday prior to the welcoming reception.

Table Mountain from the conference centre

There will be plenty of time to network and mingle with the 28 exhibitors during the long coffee and lunch breaks, as well as the evening sundowners in the Vineyard Gardens, and the dinner at the Groot Constantia Wine Estate.

Groot Constantia
Simon's Restaurant, Groot Constantia

This is going to be a special conference, made possible by the support of our many sponsors and our media partners, International Mining and Minerals Engineering and industry advocates the CEEC: Coalition for Minerals Efficiency and the Critical Minerals Association

Try to make it to Cape Town next week- you won't regret it!

#Comminution25 

Friday, 21 March 2025

March Cornish Mining Sundowner with news of mining developments in Cornwall

There were only 10 present for last night's Cornish Mining Sundowner at Falmouth's Chain Locker, but there was interesting news of developments in Cornwall.

The South Crofty tin mine is scheduled to come back into production at the end of 2027 and last night it was good to talk to the COO of Cornish Metals, Owen Mihalop, and Mike Hallewell, Consulting Metallurgist, on the latest developments. Mike has been working on the proposed flowsheet, which is based on the original flowsheet used at Wheal Jane in the 1990s, but is adapted to incorporate modern separation technologies that were not available 30 years ago.

Pre-concentration is a key feature to reduce downstream processing and pastefill costs and incorporates the latest TOMRA XRT technology for the coarser fractions and Gekko jigs for the finer fractions. DMS is replaced by jigs due to the considerable cost savings. The Gekko jig metallurgy is currently being tested but is anticipated to provide Cornish Metals with a much more attractive option.

Spiral concentration is incorporated into the grinding circuit as it was at the old South Crofty, so that coarse cassiterite is recovered prior to ball milling and around 20% of the cassiterite is estimated to be recovered via this simple route.

Multi spigot hydrosizers and Holman Wilfley shaking tables will make up the majority of the downstream circuit as it did at Wheal Jane, but Mozley MGS technology will be used on the finer size fractions where shaking table efficiency is compromised.

The Wheal Jane deslime and tin float circuit will be replaced with much simpler, lower cost and easy to operate Falcon "continuous" units for roughing at high G force and MGSs for cleaning at a lower more discerning G force.

In the photo below I am with Dave Mildren, of Gravity Mining Ltd, the Cornish company who will supply the MGS machines, Owen Mihalop, Mike Hallewell and Dave Goldburn of Holman Wilfley.

It was good to hear this month that Cornish Lithium has been granted planning permission to build the UK’s first commercial lithium production facility in Cornwall, to be established at the Cross Lanes Lithium Project, near Chacewater. The facility, which will include a demonstration plant phase, will enable Cornish Lithium to implement multiple phases of testing and enhancements, with a long-term aim of achieving full commercial production at the site. I talked to Jonny Coad and Tim Richard, Process Operatives at Cornish Lithium, about developments.

Jonny and Tim

Phase One of the project will involve drilling and testing two 2,000-metre-deep production-scale geothermal wells, which will build on successful exploration drilling at the site. Lithium-enriched geothermal waters will be extracted from the first well using state-of-the-art Direct Lithium Extraction (DLE) technology. Once the lithium has been extracted, the water will then be returned underground via the second well. These production-scale wells will also allow the Company to assess the potential for harnessing heat from the same geothermal waters to provide heating for local homes and businesses.

In Phase Two, a temporary demonstration plant will be constructed and operated to validate the production of lithium compounds at the Cross Lanes site. This phase will evaluate the opportunity to provide samples for battery and electric car manufacturers. Following successful testing and evaluation, Cornish Lithium intends to construct a commercial plant at this location.

Having drilled and tested an exploration borehole at Cross Lanes in 2023, Cornish Lithium has already established that lithium-enriched geothermal waters circulate naturally within the permeable geological structures that underlie the area. This, together with the progress made at its pilot plant facility at United Downs, where the Company has been evaluating numerous DLE technologies since 2021, affirms the feasibility of building a demonstration plant, and subject to further evaluation, a commercial-scale lithium processing facility at the Cross Lanes site. With planning consent now in place, work on the Cross Lanes Lithium Project is expected to begin this spring (see also posting of 18 September 2020).​​​​‌‍​‍​‍‌‍‌​‍‌‍‍‌‌‍‌‌‍‍‌‌‍‍​‍​‍​‍‍​‍​‍‌​‌‍​‌‌‍‍‌‍‍‌‌‌​‌‍‌​‍‍‌‍‍‌‌‍​‍​‍​‍​​‍​‍‌‍‍​‌​‍‌‍‌‌‌‍‌‍​‍​‍​‍‍​‍​‍‌‍‍​‌‌​‌‌​‌​​‌​​‍‍​‍​‍‌‍​‌‍‌​‍‌‍‍‌‍‍‌‌​‌‍‍​​‍‌‌‍​‌‍‍‌‌‌​‌‍‍​‌‍‍‌‌‌‌‌‍‌​‍‍‌​‌‍​‌‌‍‍‌‍‍‌‌‌​‌‍‌​‍‍‌​‌‌​‌‌‌‌‍‌​‌‍‍‌‌‍​‍‌‍‍‌‌‍‍‌‌​‌‍‌‌‌‍‍‌‌​​‍‌‍‌‌‌‍‌​‌‍‍‌‌‌​​‍‌‍‌‌‍‌‍‌​‌‍‌‌​‌‌​​‌​‍‌‍‌‌‌​‌‍‌‌‌‍‍‌‌​‌‍​‌‌‌​‌‍‍‌‌‍‌‍‍​‍‌‍‍‌‌‍‌​​‌​​​‌‍​‌‌‌‍‌‌‌‍​‌‍​‍‌‍‌​​​​​‍‌​​​​​​‍​​‌‍​‍‌​‌​‌‍‌‌​​​‌‍​‍​‍‌​‍​‌‍​‌‍​‍​‌​‍‌‌‍​‍‌‍‌‌‌‍‌​‌‍​‍​‍‌​‌​​‌‌​‌​​‌‌‍​​‍‌​‍‌​‍‌‌​‌‍‌‌​​‌‍‌‌​‌‌​​‌‍‌​‌‌​​‍‌​​‌‍​‌‌‌​‌‍‍​​‌‌​​‌‍​‌‌‍‌‌‍‌‌‌​​‍‌‌‌‌‍‍‌‌‍​‌‍‌​‌‍‌‌‌​‍​‍‌‌​‌‌‌​​‍‌‌‌‍‍‌‍‌‌‌‍‌​‍‌‌​​‌​‌​​‍‌‌​​‌​‌​​‍‌‌​​‍​​‍‌‍‌​​‍​​​‍‌‍‌‍‌‍​‌​‌​‌‍‌‍‌‌​​​​​​​‌‍​‍​‍‌‌​​‍​​‍​‍‌‌​‌‌‌​‌​​‍‍‌‌​‌‍‌‌‌‍​‌‌​​‍‌‌​‌‌‌​​‍‌‌‌‍‍‌‍‌‌‌‍‌​‍‌‌​​‌​‌​​‍‌‌​​‌​‌​​‍‌‌​​‍​​‍​‌‍​

Founded in 2016, Cornish Lithium now has 105 employees, many of then graduates from the Camborne School of Mines (CSM), including Chairman and CEO Jeremy Wrathall. In 2021 Camborne was placed world number 8 in the field of Minerals & Mining Engineering in the QS World University Rankings, its highest ranking ever. All the more ironic as two months earlier, following 5 months of deliberations, Exeter University decided to discontinue the  Mining Engineering undergraduate degree programme.

The 2025 Rankings have now been published and not surprisingly Camborne's ranking has dropped to a still respectable #19, its great rival, the Royal School of Mines at Imperial College now in 8th position, and the "other CSM" the Colorado School of Mines in its usual top spot. It is to be expected that Camborne will climb up the ladder again in future years now that the mining degree has been reinstated, commencing again this October.

It was good to catch up with Ben Williamson, who was a lecturer at CSM for 15 years, but is now going solo, launching his own business in Bristol. GEOXPERT HUB is a new web platform designed to connect mining companies with expert consultants, streamline recruitment and to promote specialist services. The website will officially launch in the next few weeks. In preparation for this, he is  offering promotional rates for small companies to grow their business. 

Ben is left on the photo below, with 1967 CSM graduate Pete Shepherd (right) and in the centre a new face at the sundowners, Dave Cadwell of Gravity Mining.

An interesting evening with a smallish group of people. The next sundowner is on Thursday April 17th, from 5.30pm at the Chain Locker.

Sunday, 16 March 2025

CSM Reunions in St. Ives

Next year it will be 30 years since I left Camborne School of Mines (CSM) after 22 years as a mineral processing lecturer. And it will be 60 years since I graduated in metallurgy at the University of Leeds.

I can guarantee that there will be no 60 years reunion in Leeds, as there was none for 50, or for any other year, and I have only been able to keep in touch with three of my fellow alumni. Unfortunately I have no feelings of nostalgia to my almer mater.

How different it is with CSM, with its annual dinners and other various reunions. I would be interested to know how alumni from other institutions around the world keep in touch.

This weekend Barbara and I have been in St. Ives, 25 miles from Falmouth, on Cornwall's north coast. On Friday evening we had been kindly invited to join the reunion of the CSM class of 1980. This was one of my favourite years at CSM, as many of the graduates that year were involved with my sporting activities, particularly squash, cricket and sub-aqua. They were a fun bunch, and now 45 years later, with a few grey hairs, they still are, as was very evident on Friday. Many thanks must go to Felicity Wilshaw, wife of 1980 mineral processing graduate Nick Wilshaw, for organising the reunion dinner.

There were only three mineral processing graduates present; Nick Wilshaw and Phil Moore are now retired, but Charlie Northfield came all the way from Malaysia for the reunion.  Charlie is General Manage at the Selinsing Gold Mine, in Pahang State, approximately 158 km north of Kuala Lumpur. 

With Charlie, Phil and Nick

St. Ives is a picturesque fishing harbour and seaside town renowned for its famous quality of light, which has drawn artists to the area for over a century. 

Bordering the town is the small seaside village of Carbis Bay, serviced by one of Cornwall's notoriously narrow lanes, and if asked to choose a least likely venue for a G7 summit of world leaders then Carbis Bay would be high on the list. But this was where the summit was held in June 2021 at the height of the Covid pandemic (posting of 1st July  2021)

The main road into Carbis Bay

The meeting was held at the Carbis Bay Hotel, alongside a massive security operation, police erecting a "ring of steel" around large sections of the resort.  Over 5000 police staff from across the UK were drafted into Cornwall, around 1000 being accommodated in a large cruise ship moored in Falmouth harbour near the National Maritime Museum, host to the hundreds of international media representatives. Joining the thousands of police officers were hundreds of British troops, including bomb disposal teams and a navy warship, a 400 strong US Secret Service team, and a number of patrol vessels and rigid inflatable boats to help with surveillance. Perhaps the greatest achievement of the summit was as a "super-spreading event" for Cornwall, Covid cases rocketing 2,450% in areas of Cornwall where the G7 events were focused.

Yesterday Barbara and I walked the beautiful stretch of coastline to the Carbis Bay Hotel, where G7 leaders had been met by British Prime Minister Boris Johnston with staged socially distanced greetings, with obvious lack of social distancing at other events. 

Leaving St. Ives via Porthminster Beach
The magnificent Carbis Bay Beach
Relaxing in the Carbis Bay Hotel

The G7 leaders were housed at the Tregenna Castle Hotel in St. Ives, which some of you will remember as being the venue for Minerals Engineering '95.

The Tregenna Castle was the venue for the CSM Annual Dinner last night, attended by alumni from all over the world.

Predrinks were in front of the big screen in the hotel bar, to savour the England rugby team thrashing Wales with a record score of 68-14.

Cornish Lithium Founder and CEO Jeremy Wrathall graduated from CSM in 1985 with an MSc in Mining Geology and he had organised a reunion for the class of 1985. It was particularly good to see Dr. Ebenezer Aliu Damisa who had come all the way from Nigeria, where he teaches at the Ahmadu Bello University, for the reunion. He graduated in 1985 with a degree in mining engineering.

With Jeremy and Ebenezer

It was also great to talk to  one of my mineral processing degree students for the first time in 40 years. Jonathan Evans had travelled from South Carolina for the reunion.

Also good to catch up with other 1985 mineral processing alumni, Paul Morgan and Pete Flitcroft, and 1984 graduate Jim Turner.

With Jim, Paul and Pete

We are back in Falmouth now after a great weekend, and thank the organisers of the dinner, Nicola Wilton, the new CSM Association secretary and Andy Wetherelt, of CSM, for a very enjoyable Saturday night.

Thursday, 13 March 2025

Material World by Ed Conway

Critical minerals, such as lithium, copper, cobalt, graphite, nickel, manganese, and rare earth elements, are indispensable to the low-carbon energy transition, driving a global surge in demand that shows no signs of abating. Paradoxically, the foundation of clean energy lies in the mining industry. While the raw value of these minerals is significant, their true impact emerges through refinement and integration into high-value technologies, fueling markets worth billions. Electric vehicle batteries, wind turbines, and solar photovoltaics demand significantly higher quantities of minerals and rare earth elements compared to their conventional counterparts. 

However, the extraction processes alone generate billions of tons of CO2 emissions, comparable in some instances, such as lithium mining, to the carbon footprint of coal mining. Virtually every industrial process produces carbon, or at the very least is very energy intensive, which makes attaining net zero such a challenge

If there is one book that I would recommend in order to understand the intricacies of the modern world it would be Material World by Ed Conway, in which he explains the scale of the environmental problem and the irony of new demand created by efforts to wean ourselves off oil on to batteries. In 2019 more materials were extracted than in the years to 1950 combined and this is the story of the modern world (and a bit of our history and some glimpses into the future) told through the eyes of the materials we couldn't do without. 

Conway traces the history of humanity and also its potential future through the remarkable stories of six essential substances, which built our world and will transform our future: 

Sand, the world's most mined commodity, at around 50 billion tonnes per year, the foundation of the modern world, the silicon substrate from which we make glass, concrete and ultra pure single crystals of silicon for our computers.

Salt, the chemical without which life couldn’t exist. An enormously underrated material which still provides the backbone for much of the chemical, agricultural and pharmaceutical world today.

Iron, the skeleton of the built world, from which we make steel.

Copper, from which the electrical networks of the world are made. It is hard to overemphasise how much copper matters, especially given we are steaming towards a green energy transition which will depend largely on intensive electrification.

Oil (and gas) - even in today’s world, we still depend enormously, massively, on oil and gas. The world is still mostly propelled by oil. Oil products are in our batteries, in our plastics, in pretty much every consumer product.

Lithium, the element without which nearly all of the world’s most advanced batteries would not work. 

According to the author, these are the six most crucial substances in human history. They took us from the Dark Ages to the present day. They power our computers and phones, build our homes and offices, and create life-saving medicines. But most of us take them completely for granted. As we wrestle with climate change, energy crises and the threat of new global conflict, Conway shows why these substances matter more than ever before, and how the hidden battle to control them will shape our geopolitical future. 

In the course of three years’ research Ed Conway travelled the globe - from the sweltering depths of the deepest mine in Europe, to spotless silicon chip factories in Taiwan, to the eerie green pools where lithium originates - to uncover a secret world we rarely see. Revealing the true marvel of these substances, he follows the mind-boggling journeys, miraculous processes and little-known companies that turn the raw materials we all need into products of astonishing complexity.

The book combines history, technology, analysis and vibrant description of the virtuosity of the materials geniuses that have laid the foundations for the world we live in. It also reminds the reader constantly of the interconnectedness of everything, how different commodities and manufactures combine to create the objects that make modern life what it is. The striking thing about the world we live in today is just how far and wide we range across the periodic table. The earliest circuit boards contained 11 elements, those in modern smartphones contain more than 60.

Humans have become extraordinarily good at turning seemingly simple substances into products of amazing intricacy and effectiveness, such as silicon chips containing billions of transistors. each smaller than a virus and literally invisible, and this is why Ed Conway’s Material World is such an important and fascinating read.

Monday, 10 March 2025

Flotation '25 update: short course and new keynote

Flotation is becoming of increasing importance as ore grades across the world have started to fall significantly over the past few decades. Copper is of a particular concern, since this is the most critical metal for the renewable energy sector of the future. The average copper ore grade has decreased by approximately 25% in just 10 years. In that same period, the total energy consumption has increased at a higher rate than production, 46% energy increase over 30% production increase.

The trend of declining copper grades is unlikely to be reversed and less capital intensive oxide ore bodies are being exhausted across the globe. The copper in oxide ores is soluble, allowing direct extraction through leaching rather than physical separation, while sulfide extraction is more complex, requiring froth flotation after grinding. The volume of ore sent to concentrators has risen by 44% to 1.1 billion metric tons over the past 10 years. This volume would need to increase by another 44% by 2031 to produce enough copper necessary for the global energy transition.

The demand for all minerals and metals is rising, driving the need for high-grade ore beneficiation and sustainable mining practices, boosting demand for advanced flotation chemicals such as collectors, frothers, dispersants, and depressants. With advancements in flotation chemical solutions for ore beneficiation processes, mining companies are prioritising sustainability and efficiency to enhance metal recovery rates.

Developing nations, particularly in Asia-Pacific, Latin America, and Africa, are witnessing a rise in mining operations. The introduction of bio-based and eco-friendly flotation reagents is revolutionising the market, reducing the environmental footprint while maintaining performance.

Flotation '25, in Cape Town in November, will be immediately preceded by a one-day course on Flotation Chemistry:  Fundamentals and Practice delivered by the University of Queensland's Associate Professor Liza Forbes. The course will cover the crucial role of flotation reagents in mineral resource recovery, combining an accessible overview of theory and placing it in context with plant practice, with examples from real-world flotation operations.   Registration for the course is now open.

Liza is also one of the four keynote speakers at Flotation '25. She will review how flotation chemistry research has had a long history of successful innovation, from the use of simple oily reagents to the developing understanding of interfacial science to the design and implementation of sophisticated chemistries. However, Liza feels that in the last 20 years, metallurgists have become increasingly disillusioned with the discipline. The industrial approach to flotation chemistry optimisation became a search for a “silver bullet” reagent, with a string of expensive and disappointing trials. 

The high demand for “critical” metals, fuelled by the urgency to transition to renewable energy, has put increasingly more pressure on minerals processing operations. It is, therefore, imperative, says Liza, that flotation chemistry research moves beyond simple reagent trials towards a holistic approach that considers ore properties, surface chemistry, cell hydrodynamics and process water characteristics. The keynote will outline examples of such research and how they can build a more unified approach to flotation chemistry research with industrial applicability and impact. 

Flotation '25 is a conference not to be missed in this crucial period in the mining industry. As one of our other keynote speakers, Chris Greet, said in the previous update:  "I would encourage all those young and not so young mineral processors with a passion for bubbles to put their fingers to the keyboard and write an abstract for Flotation '25 in Cape Town. This conference is renowned for bringing academics and industry together to discuss the science of mineral froth flotation- an event not to be missed!"

So we encourage you to submit abstracts via the website portal, the deadline for submission being May 31st.

Due to the high level of interest in Flotation '25 the 23 booths in the exhibition area have now been allocated but we have been able to place extra 2x1m booths in the upstairs area of the conference centre, outside the room where the talks are held.

Finally a thanks to all our sponsors and our media partners, International Mining and Minerals Engineering and our industry advocate, the Critical Minerals Association. If you would like to sponsor, details are also on the website.

#Flotation25

Friday, 7 March 2025

Memories of Pyromet '05 and Biohydromet '05

Twenty years ago this month, MEI held two small conferences back-to-back at the Mount Nelson Hotel in Cape Town.

Pyromet '05, a 2-day conference, was the 2nd conference on pyrometallurgy, and was attended by around 50 delegates. Selected papers from the conference were published in Minerals Engineering, Volume 19 Number 3. A few photos from the meeting are shown below:

Following Pyromet '05 was the 3-day Bio and Hydrometallurgy '05 which included a conference dinner at the Groot Constantia wine estate and a challenging hike to the top of Table Mountain. Papers from the conference were published in Volume 18 Numbers 13-14 of Minerals Engineering. Photos from the meeting are shown below: