Tuesday, 10 July 2018

Copper-Cobalt Africa off to a great start

The bank of the Zambezi River was a perfect setting last night for the welcoming cocktail party at the SAIMM conference, held in association with the 9th Southern African Base Metals Conference.
MEI's Amanda was, of course, very much involved with the great networking opportunities, and has sent these photos, just a few of many that she will be posting on a 'people' blog when she returns from Zambia next week. I look forward to that, as over 290 delegates are registered for the event!
Conference chairperson Kathy Sole, with Lennart Scheunis of Umicore
Amanda with the Outotec delegation
 

Monday, 9 July 2018

Sizzling Sunday

The UK is basking in its longest heat wave in 5 years, and yesterday was particularly hot. I took a long slow bike-ride, passing two of Falmouth's main beaches, which looked splendid under a clear blue sky.
Falmouth's Swanpool Beach
Gyllyngvase Beach

Jon, along with 10,000 other cyclists, was enduring the 88 mile Velothon Sportive in Wales, said to be the most spectacular cycling event in UK, with temperatures over 30 C enhancing the challenge of the elevation gain of over 5000 feet.
Jon and his friend Matt in Wales

Amanda, meanwhile, was relaxing in Zambia, at the Avani Victoria Falls Resort in Livingstone. This is Amanda's first visit to the land of her birth since she left Chingola in 1973 as a one-year old. She is representing MEI at the SAIMM Copper-Cobalt Africa conference, which begins this evening.
Amanda and friends relaxing by the pool
A great view of The Smoke that Thunders, from the bank of the Zambezi
 

Friday, 6 July 2018

A brief visit to Cornwall by Magotteaux's Chris Greet

Every mineral processor is, or should be, aware that flotation efficiency is very much linked to the product from the upstream comminution circuit. Nevertheless it is common at large conferences, such as IMPCs and SMEs, for flotation and comminution sessions to run in parallel, such that there is little opportunity for specialists in these two areas to discuss comminution-flotation as a single entity. 
I am also aware, of course, that MEI's focussed comminution and flotation conferences, by attracting specialists in these two fields, do not encourage potential fruitful collaboration. This is something that we are trying to change by inviting specialists in comminution to present appropriate work at flotation and vice-versa. It is happening only slowly however, but one company that sets an example is Magotteaux, regular sponsors of MEI's comminution and flotation series. Dr. Chris Greet, Manager Metallurgy-Minerals Processing Research at Magotteaux Australia, has presented papers at most of the flotation conferences, and in recent years the comminution conferences, highlighting the intimate link between flotation and comminution, not only in regard to the size and liberation of particles, but also to pulp chemistry.
Chris (right) in full flow at Flotation '13
So important is pulp chemistry that Magotteaux designed a laboratory mill which reproduces the pulp chemical conditions of the plant grinding mill in the laboratory. The Magotteaux Mill® allows the user to investigate the impact of grinding chemistry on their metallurgical process. The product generated in the laboratory has nominally the same physical properties (particle size distribution) and pulp chemical properties (Eh, pH, dissolved oxygen, oxygen demand and EDTA extractable iron) as an equivalent sample taken from the plant. This signifies a distinct advantage in testing as the results produced in the laboratory are more representative of those that would be observed in a plant.
The UK company Grinding Solutions Ltd (GSL), regular sponsors of MEI's Comminution conferences, are also very aware of the link to flotation, and a couple of years ago took possession of the Magotteaux Mill in their rapidly expanding premises in Cornwall.  They have found that the mill enhances significantly the ability to monitor chemical conditions during milling, which allows greater understanding, and improvement, of flotation performance response.
Chris spent the day with GSL yesterday, a first and very brief visit to Cornwall, a welcome detour on his way from Dusseldorf to Johannesburg, and Barbara and I enjoyed a great meal with him, and Nick and Flee Wilshaw of GSL, in the most beautiful of settings overlooking Falmouth's Swanpool Beach.
Me, Chris, Barbara, Flee and Nick at Hooked on the Rocks, Falmouth
Twitter @barrywills

Wednesday, 4 July 2018

Provisional programmes for Process Mineralogy '18 and Hi-Tech Metals '18 published

Process Mineralogy '18 and Hi-Tech Metals '18 will run back to back at the Vineyard Hotel in Cape Town in November.
Sundowner in the Vineyard Hotel Gardens

Process Mineralogy '18 is the 5th in the well established series, and is sponsored by ZEISS, Bruker, Thermo Fisher Scientific and iMin Solutions. The media sponsor is International Mining. The provisional programme can be found here.
Current Process Mineralogy '18 sponsors
Hi-Tech Metals '18 is a brand new MEI Conference, and, as expected, is off to a fairly quiet start. The provisional programme can be found here.
Programmes for both conferences will evolve over the coming weeks, so if you would like to present papers at either, or both, events, please let me have your short abstracts as soon as possible.
The very latest updates on the conferences can be found at #ProcessMineralogy18 and #HiTechMetals18.
 

Sunday, 1 July 2018

Wheal Peevor- a forgotten historical mining gem

Remarkably few people that I talk to in Cornwall have heard of Wheal Peevor, which is situated in a remote area 1.5 miles north-east of the once rich mining town of Redruth. Largely overgrown and forgotten until 2003, Wheal Peevor was the subject of an £810,000 grant to repair, protect and preserve this important site, which was open to visitors in January 2008.
The mine site is extraordinary because it is a rare example of what was once ordinary, and the network of tracks and trails around the site, along with way finder points and very informative information boards, give a real insight into the history behind the landscape and the present-day diversity of the wildlife and flora.
Strategically placed information boards
So impressed was I when I first saw it, only a few weeks ago, that we will be incorporating a visit into the programme of next year's Physical Separation '19.
The once impressive entrance to Wheal Peevor
The five hectare site is unusual because it is the only 3 engine house mine site in the important central mining District around Camborne and Redruth. It contains the remains of three engine houses: the largest engine, with a 72 inch cylinder, was used for pumping water out of the mine; the second, used for winching material in and out of its shaft and the third, with a 32 inch engine, operated 48 heads of Californian stamps for crushing the ore, which was then treated in buddles, and the concentrate calcined to remove arsenic, the ruins of the processing plant also being part of the trail.
The stamps, pumping, and winding engine houses
The winding engine house viewed from the pumping engine house interior
The remains of 20th century Frue vanner foundations in front of the Stamps House
Wheal Peevor was a very wet mine underground, records stating that there were at one stage three Newcomen Engines working on the sett in an attempt to de-water the mine. By the early 19th century it also had the advantage of being drained by the Great County Adit, a network of over 40 miles of interconnected adits which drained over 100 mines in the district, before emptying into the Carnon River near the village of Twelveheads.
The mine was being worked for copper at shallow depth in the late 18th century, but when the copper price slumped after 1788, rich tin deposits were discovered at depth underlying the copper. The tin ore assayed at about 4% as opposed to the more usual 1-2% and fortunes improved, and in its heyday Wheal Peevor employed 186 men underground and about 135 people on the surface. The mine struggled on through the 1880s but by the late 1880s it was no longer economically viable and was abandoned. However attempts were made to re open it in 1912 and 1938 primarily for the extraction of wolfram.
Although Wheal Peevor was a relatively small mine it had been extremely rich, producing 3280 tons of cassiterite, 5 tons of 4% copper ore, 7 tons of pyrite and 12 tons of arsenopyrite between 1872 and 1889.

Twitter @barrywills  #PhysicalSeparation19