Thursday, 21 September 2017

Metplant '17 awards to two young JKMRC researchers

Although MEI was a media partner for this month's Metplant '17 in Perth, unfortunately we were unable to attend. Which was a pity as I would have liked to have seen Dr. Grant Ballantyne, of the University of Queensland's JKMRC, receive the award for the best conference paper. Juan Jose Frausto Gonzalez, who is a JKMRC PhD candidate, received the Best Presentation award.
Juanjo and Grant with Janine Herzig, of the AusIMM board and Joe Pease, of Mineralis Consulting, and Chairman of CEEC
Grant is a regular contributor to MEI's comminution conferences and has been invited to take on the role of one of the new Assistant Editors for Minerals Engineering. His paper looked at Recent Improvements in the Milling Circuit at Tropicana Mine and was co-authored by Mike Di Trento, Ivka Lovatt and Brian Putland from AngloGold Ashanti and Orway Mineral Consultants (OMC).  OMC have conducted two surveys at Tropicana mine in 2015 and 2016 and these formed the basis for the paper.  Due to their high power costs, Tropicana operate a high pressure grinding roll (HPGR), ball milling comminution circuit.  In 2015 they were achieving results close to design, but more recently the throughput was increased by 20% following a substantial optimisation process where the HPGR closing screen size was reduced to 2.5 mm, the recycle conveyor capacity was increased and the HPGR speed was increased.  This paper utilised the new Size Specific Energy (SSE) and Comminution Energy Curve methodologies to present this data and communicate the benefits achieved.
Juan Jose’s presentation was titled The Impact of Classification Efficiency on Comminution and Flotation Circuit Performance and was co-authored by Grant, Kym Runge, Malcolm Powell and Roman Cruz from the JKMRC and Frensillo’s Minera Saucito mine.  The operation of cyclones versus fine screens in the ball milling node at Minera Saucito was presented.  The implications of classifier type was presented in terms of comminution performance, mineral deportment, mineral liberation, flotation recovery, concentrator footprint and maintenance. This was the kind of comprehensive study into fine screens that has been called for by many practitioners.  Juan presented this information with clarity, and succinctly, this being all the more impressive due to the fact that English is his second language.
Congratulations Grant and Juan from all at MEI, and we hope to see you in April at Comminution '18.
Twitter @barrywills

Saturday, 16 September 2017

See who will be at Flotation '17 this November

Things are looking good for November's Flotation '17 in Cape Town (see also posting of 5th July), and the timetable will be finalised within the next few weeks.
If you are thinking of registering, you might wish to take a look at who is already committed to attending. This delegate list will be updated regularly as we approach the event.
The exhibition will provide a focal point for networking, as the booths, and the poster displays, will be in the coffee and lunch break-out areas. Currently 4 booths are still available for rental.
Enjoying local wines in the exhibit area at Flotation '15

Flotation '17 will provide a great opportunity to discuss the latest developments in this essential field with the world's leading experts.
I surely benefited from this conference and enjoyed my time at Cape Town. As a young researcher, this conference gave me not only a unique opportunity to meet the top scholars and specialists in the flotation area, but also a better understanding of the current hot topics in flotation research, so thank you, Flotation ‘15.
Ming Zhang (PhD student from the University of Queensland)

See more testimonials

Friday, 15 September 2017

A welcome return to Falmouth's Chain Locker

The 17th century Chain Locker pub, by Falmouth's inner harbour, has in recent years become the premier meeting place for Cornish mining people and their visitors to this beautiful part of Britain. It is the preferred summer venue for the Cornish Mining Sundowners and MEI's Falmouth conferences. But not this summer, however, as the pub re-opened only this month after many months of refurbishment.
Last night I had a couple of pints in the bar with one of Camborne School of Mines' most dedicated alumni. Since graduating from CSM in 1983 Sam Wood has had an interesting career in mining and quarrying, in west Africa, but mostly in the north of England, latterly being involved with geotechnics and the reclamation of mining sites, surveying and tunnelling.  Sam is a real Camborne stalwart, travelling up to four times a year to Cornwall for CSM functions from his home in Sheffield, 350 miles away.
Chain Locker Falmouth
I will be in China next week so will miss the September sundowner, but if any of you are in the area you will find a great Cornish welcome at the splendidly restored Chain Locker on Thursday evening, commencing at 1730.
Twitter @barrywills

Thursday, 14 September 2017

High technology metals: Facts, Fiction and Recycling

Less than half a century ago the rare earth elements were classed as minor metals - who had even heard of neodymium, now essential in the production of powerful rare earth permanent magnets, used in wind turbines and many other applications? Lithium was essentially a curiosity, the third element in the Periodic Table, and the lightest metal. Now, of course it is in high demand for light, powerful batteries, and the increasing prevalence of electric cars (posting of 30 August) will increase the demand for this once minor metal.
The rare earths and lithium are primary mined, but some of the once minor metals, such as gallium, germanium and indium, which are essential for our modern way of life, are by-products of base metal mining.
Jens Gutzmer
The importance of all these metals cannot be overestimated, which is why we are looking forward to next years MEI Conference in Cape Town Developments in the Processing of the "Hi-Tech" Metals. We are also pleased to announce the first keynote speaker, Prof. Jens Gutzmer, the founding director of the Helmholtz Institute Freiberg for Resource Technology, and professor of economic geology and petrology at the Department of Mineralogy, TU Bergakademie Freiberg, Germany.
In a paper co-authored by Max Frenzel and MEI Consultant Markus Reuter, Jens will examine the number of expressions used to describe this group of commodities that are considered essential ingredients for technology development and economic prosperity. In some publications, these are referred to as “high technology metals”, in others they are named “strategic” or even “critical raw materials“. To add confusion the actual composition of this large and disjointed group of commodities is subject to on-going change – depending largely on perspective, technology and material development, geostrategic positioning and market status. Prof. Gutzmer will address reasons for the apparent confusion – and the inherent weakness of processes to identify “critical raw materials”. Furthermore, results of current efforts to quantify global resource potentials especially of by-product metals – many of which are regarded as “critical” - will be discussed.
Crucially, he will consider the role of recycling vs. primary production in the near- to mid-term supply of high technology metals. This aspect is vital as we have to get smarter at recovering and reusing the vast quantities that we have already extracted from the earth, rather than relying on continued pursuit of new reserves of ever poorer quality and at substantial environmental cost. Recycling of these critical elements, which are used in every smart phone, but in tiny quantities and often alloyed, is one of the great challenges facing mineral processing this century, and will also be a major topic at Sustainable Minerals '18 in Namibia.

Monday, 11 September 2017

Ro-Star ultrafine grinding mill to be highlighted by Maelgwyn Mineral Services at Comminution '18

It is good to welcome Maelgwyn Mineral Services (MMS) as a sponsor of Comminution '18. The small Welsh company will be using the conference and exhibition to highlight the progress on the development of the Ro-Star ultrafine grinding mill within its collaboration under the European Institute of Innovation and Technology (EIT) Raw Materials project.  This EU funded KAVA project, co-ordinated by the TU Bergakademie Freiberg - Institute of Mechanical Process Engineering and Processing Technology, is investigating upscaling of the Ro-Star mill from laboratory and pilot size to industrial size mills.
Apart from MMS and TU Bergakademie Freiberg, other collaborators include CEMTEC, Austria, University of Liege, Belgium, Sandvik, Sweden and Assarel Medet, Bulgaria.
Ro-Star Pilot Unit
The mill is a vertical fine grinding mill, where gravity force enables a higher filling level than in horizontal mills and a hydraulic pressure on the grinding beads. It is envisaged that the optimised milling system will be characterized by a 50 % increased operation period; 50 % lower maintenance needs and high energy efficiency (20-30 % less energy consumption than similar technologies).

Thursday, 7 September 2017

A Celebration of Cornish Mining

I spent this morning at an interesting conference at Heartlands, between Camborne and Redruth, in the heart of the old tin and copper mining district. The conference, which marked the centenary of the Cornish Chamber of Mines and Minerals,  was well attended by over 100 delegates, mostly members of the Cornwall Mining Alliance.
Prof. Frances Wall (4th left), former CSM Director, with members of the Women in Mining Group
Penda Diallo
A view of the future of mining was presented by short talks by five young lecturers who have recently joined Camborne School of Mines (CSM), including Penda Diallo, who commenced her lecturing duties at CSM only two days ago! Although she spoke for only 5 minutes, on the increasing importance of social issues for global mining opportunities, she put her points over very impressively and it is clear that she is going to be a great asset for the school.
Cornwall was once the world's biggest producer of copper and tin, and the last tin mine to close, in 1998, was South Crofty, just across the road from Heartlands, which ended 400 years of continuous copper and tin production. Canadian company Strongbow Exploration is now committed to dewatering and redeveloping the mine, which they hope to bring into full production in late 2020 or early 2021.  A year ago (posting of 19 August 2016) I and many others were very sceptical about a revival of mining at South Crofty, mainly because we had heard it many times before without anything coming to fruition. But now it really does look like this will happen; Strongbow has invested a lot of capital into this venture and has already run successful trials to dewater the mine, and, crucially, treat this water before discarding into the nearby Red River ( so called because of the contained hematite from the old mine tailings). A full water treatment plant is expected to be on-stream next June.
Owen Mihalop
Owen Mihalop of Strongbow gave an excellent presentation which inspired much confidence in the project. When South Crofty closed in 1998 the main use for tin was in the plating industry to produce 'tin' cans but now it has an important use in electronics, being alloyed with indium in touch screens for instance, and so can be regarded as a "High-Tech" metal (see also posting of 5th June). It is also now regarded as a strategic metal, as Asia, mainly China and Indonesia, account for 65% of world tin production, and there are very few tin mines now in the Western world. So all looks good for the go-ahead; planning permission has been granted for the surface plant, and the resources are certainly there, with an estimated 45,000 tonnes of tin in ore grading around 1.8%, giving an expected mine life of 8 years, but with much potential for expansion once dewatering is finished and further exploration can be carried out.
The new mine will bring jobs and prosperity to a fairly depressed area of Cornwall, and many local companies will benefit, not least Holman-Wilfley, a major supplier of shaking tables, represented at the conference by sundowner regular Dave Goldburn!
Jeremy Wrathall
All is looking good too for Cornish Lithium, focussed on the opportunity to extract lithium from 'geothermal brines' that occur throughout a large area of Cornwall. Evaporation plays a major part in treatment of lithium brines, but new technology  is helping to make other options more viable. Cornish Lithium CEO, and former CSM student, Jeremy Wrathall showed how it may now be possible to extract lithium from this source given recent advances in drilling, and extractive technologies such as reverse osmosis, ion-exchange and membrane technology, the latter being announced this week by International Lithium as a viable alternative to evaporation, used in arid countries such as Chile, Australia, and Nevada in the USA. The "new industrial revolution", the ending of the internal combustion era and the rapid adoption of electric cars and power storage batteries (posting of 30th August) is driving a significant increase in demand for lithium which has seen prices triple over the past two years.
After lunch there were presentations from two old friends. Nick Wilshaw, of Comminution '18 sponsor Grinding Solutions Ltd, presented "Cornwall - a centre of mining and processing innovation" showing that he is passionate about promoting the quality and volume of innovation in the industry that comes out of Cornwall.
Grinding Solutions marketing manager James Strong met with MEI's Jon Wills at the event to agree attending and exhibiting at a number of upcoming MEI conferences - Flotation '17, Comminution '18 and Biohydromet '18. Grinding Solutions has extensive experience and expertise in flotation and fine grinding and recently expanded their lab facilities to incorporate leaching and biohydromet labs, where they will be hosting the October Cornish Mining Sundowner.
Past CSM student Jim Turner of Micon International, Cornwall, with Grinding Solutions'
Nick Wilshaw, James Strong and Tom Naylor
Dr. Tony Batchelor, of Geoscience Ltd, the guru of geothermal energy in Cornwall, showed how systems generating electrical power can be built economically in Cornwall, the first system being currently developed at the United Downs Deep Geothermal Energy Project (see also posting of 18th August). It was particularly good to congratulate Tony on his award this week of a Fellowship of the Royal Academy of Engineers.
All in all a good day, and the future looks bright for major mining revivals in Cornwall.
Twitter @barrywills