Ihlenfeld C.,Anglo American |
Keays R.R.,Monash University
Mineralium Deposita | Year: 2011
Diamond drill core traverses across the Platreef were carried out at Tweefontein, Sandsloot, and Overysel in order to establish the relationship between crustal contamination and platinum group element (PGE) mineralization. The footwall rocks are significantly different at each of these sites and consist of banded iron formation and sulfidic shales at Tweefontein, of carbonates at Sandsloot, and of granites and granite gneisses at Overysel. As demonstrated in this study, Platreef rocks are characterized by two stages of crustal contamination. The first contamination event occurred prior to emplacement of the magma and is present in Platreef rocks at all three sites, as well as in the Merensky Reef. This event is readily identified on trace element spidergrams and trace element ratio scattergrams. The second contamination event was induced by interaction of the Platreef magma with the local footwall rocks. It is most easily identified at Tweefontein, where there is a large increase in the FeO content of the Platreef rocks, and at Sandsloot, where there is a large increase in their CaO and MgO contents, relative to Bushveld rocks that are uncontaminated by the local footwall rocks. At Overysel, the second contamination event did not result in pronounced changes in the major element composition of the Platreef rocks, but can be detected in their trace element chemistry. A strong inverse relationship between PGE tenors and S/Se ratios is interpreted to suggest that the PGE-rich sulfides were formed prior to emplacement of the Platreef magmas through assimilation of crustal S and became progressively enriched in the PGE during transport. Rather than promoting S-saturation, interaction of the Platreef magma with the footwall rocks diluted the metal tenors of the sulfides. Although both the Platreef and the Merensky Reef magmas were contaminated by the same crustal contaminant and were probably PGE-rich, they have radically different Pd/Pt ratios. Their Pd/Pt ratios suggest that whereas the Merensky Reef magma became PGE-rich due to dissolution of PGE-rich sulfides segregated from a pre-Merensky magma that had undergone relatively little fractionation prior to reaching S-saturation, the pre-Platreef magma had undergone greater fractionation prior to the sulfide saturation event, thereby increasing its Pd/Pt ratio. We suggest that the magmas that formed the Platreef and Merensky Reef may have simply been carrier magmas for sulfides that had formed elsewhere in the plumbing system of the Bushveld Complex by the interaction of earlier generations of magmas with the crustal rocks that underlie the Complex. © 2011 Springer-Verlag. Source
Dworzanowski M.,Anglo American
Journal of the Southern African Institute of Mining and Metallurgy | Year: 2012
The beneficiation of fine iron ore will increase in importance in the future because most new iron ore resources will be in the form of lower grade ore deposits that will require liberation of iron ore minerals at finer sizes. Generally this fine iron ore will be beneficiated to produce a pelletizing concentrate with very strict chemical and physical specifications. In addition, because of the increasing demand for iron ore there are now more opportunities to produce by-product iron ore from mining operations producing other commodities. In the past the associated iron ore minerals would report to final tailings but now there is potential value to be realised from by-product revenue. These by-product iron ore opportunities are almost all centred on producing pelletizing concentrate. Currently pelletizing concentrates are produced mainly by various combinations of flotation and magnetic separation. The selection of the beneficiation route will depend on ore mineralogy and considerations around plant capacity and final concentrate quality. The main economic iron minerals are magnetic, haematite being paramagnetic and magnetite being ferromagnetic. This, therefore, means that magnetic separation can be applied, in principle, to all fine iron-ore beneficiation plants. While flotation has a considerable capacity advantage over magnetic separation, the real advantage of magnetic separation over flotation in fine iron-ore beneficiation is that treatment of -10 μm iron ore is possible-in flotation, the feed is deslimed at 10 μm and the -10 μm stream is considered to be final tailings, even though there is often a significant amount of contained iron ore. This paper describes a study around the recovery of fine magnetite in the form of a pelletizing concentrate. The study is based on an evaluation of an iron ore by-product opportunity from an iron oxide copper-gold (IOCG) deposit. Experiments were conducted to quantify the differences in magnetic separation performance with decrease in particle size treated. A mineralogical evaluation of all the test work products was undertaken to facilitate the interpretation of the test work results. These results were then used to propose an economically viable flowsheet for maximizing fine magnetite recovery using magnetic separation. © The Southern African Institute of Mining and Metallurgy, 2012. Source
« BMW Group developing self-driving robots for supply logistics; recycled BMW i3 batteries for power | Main | Faurecia using flax-based composite in Urban Liftgate demonstrator » A group of companies in the UK is aiming to set two new records for hydrogen fuel cell electric vehicles (FCEVs) as part of Hydrogen Week (11-18 March), with a continuous five-day and five-night drive around the M25 highway. Working together, the partners of the government-backed London Hydrogen Network Expansion project (LHNE) will attempt to set new records for the longest journey on one tank of hydrogen (existing record 435 miles/700 km) and the longest continuous FCEV journey (6,024 miles/9,695 km). The record attempts, which will start on Monday, 14 March, are part of the project’s efforts to increase awareness of the benefits of hydrogen-fueled cars. A series of drivers, including members of the media, will take the wheel of a Hyundai ix35 Fuel Cell vehicle which will complete approximately 50 clockwise laps of the M25 between Monday and Friday next week. LHNE, co-funded by Innovate UK, was set up in 2012 to create the UK’s first hydrogen-powered transport system across London and the South East. The project is being undertaken by a consortium, led by Air Products, and has delivered a publicly accessible, state-of-the-art fast-fill 700 bar renewable hydrogen fuelling station as well as upgrading a second refueling station to 700 bar. LHNE has also deployed new hydrogen vehicles in London; including a number of Hyundai hydrogen fuel cell vehicles and Revolve hydrogen-fueled vans. Hyundai Motor’s ix35 Fuel Cell car has been commercially available since 2014 and, last year, Toyota introduced its Mirai FCEV to the market. The LHNE partners are now keen for the adoption of hydrogen fuel cell technology to accelerate in the UK but one of the main challenges is the limited coverage of refueling stations to support the vehicles. There are currently six stations in the UK, including the two public Air Products SmartFuel stations in London and funding is in place for at least 12 to be operational in England and Scotland within the next 12 months. The LHNE consortium comprises Air Products, Anglo American, Cenex, Commercial Group, Element Energy, the Greater London Authority, Heathrow Airport Ltd, Hyundai Motor UK Ltd, Johnson Matthey Fuel Cells Ltd, Revolve Technologies Ltd, and Shell. The project is co-funded by the UK’s innovation agency, Innovate UK. It is one of five research and development projects selected by the Technology Strategy Board in 2012 to help accelerate the adoption of energy systems using hydrogen and fuel cell technologies, bringing them into everyday use. The Mayor of London and the Greater London Authority have played a supporting role in the project.
News Article | April 22, 2016
(Reuters) - California Public Employees' Retirement System (Calpers) said its proposal for Anglo American Plc to report on environmental risks associated with climate change was passed at the miner's annual shareholders meeting.Anglo American
News Article | November 11, 2015
Drastic times call for drastic measures. Shares of mining giant Anglo American remained friendless for most of the session, touching a 16-year low of 481.45p before closing a penny dearer at 492.75p and still a million miles away from the May 2014 peak of 1678p. Numis analyst Matthew Hasson said chief executive Mark Cutifani must get his finger out and make some bold decisions and soon. The investor day is on December 8. Hasson admits that he, along with many other number crunchers, has been bearish on Anglo for some time as the mining giant struggled with travails at Kumba Iron Ore, depressed platinum and diamond prices and volumes, and the troubled Minas-Rio iron ore project in Brazil which has proven to be a drain on cash, which has further stretched the balance sheet. Weak coal prices have exacerbated the problems. Cutifani needs to stop the rot and Hasson says Anglo is still an asset-rich company and so he has number of options to slash group debt which stands at around £8.6bn. He is of the opinion that Cutifani’s best bet would be to sell 30 per cent of De Beers to the market in the form of an IPO. That would rake in between £1.3bn and £1.98bn and if you add in a suspension of the dividend which would save £662m and the sale of the niobium mine for £330m, the balance sheet would look very manageable. If Cutifani does not get his act together and the share price falls further in the short term, former Xstrata boss and now X2 chief Mick Davis could be waiting in the wings. Anglo cut 53,000 jobs or 35 per cent of its workforce and incurred a loss of £1.98bn in the first half of 2015. Still fearing a dividend cut and spiralling compensation costs following Friday’s devastating collapse of two tailings dams at the Samarco iron ore mine in Brazil, which it operates in a 50-50 joint venture with Brazil’s Vale, BHP Billiton lost 22.8p more to 923.7p. Helped by news that UK’s unemployment rate fell to its lowest level since 2008 and earnings grew more slowly than expected, suggesting that the Bank of England is in no hurry to hike UK interest rates, the Footsie rose 21.92 points to 6297.20, while the FTSE 250 put on 61.95 points to 17101.77. Wall Street provided little in the way of inspiration on Veterans Day, slipping 55.99 points to 17,702.22. Many fund managers in are keeping their powder dry, fearing the Fed will next month raise US interest rates for the first time in seven years. Branded sports group Nike lost ground due to the escalating doping scandal involving Russian athletes. British wealth manager St James’s Place, which recently reported record third-quarter inflows of £1.48bn, up 17 per cent, advanced 24p to 971p while Merlin Entertainments added 10p at 410.3p after UBS advised clients to buy and raised its target price to 485p, from 440p. Cyber security company Sophos, which floated in June at 225p, jumped a further 22.5p to 274.3p. Buyers piled in again after the Oxford based company increased its outlook for 2016. Like-for-like billings growth is now expected to be in the range of high teens to 20 per cent, well up on the ‘mid-teens’ forecast made earlier in the year. Billings grew 24.2 per cent in the first-half of the year. On a day when Victoria ‘Posh Spice’ Beckham was featured in the press wearing ridiculous four-and-a-half inch stiletto heels on her £585 shoes, shares of the quoted luxury shoes retailer and wholesaler Jimmy Choo pulled up lame at 152p, down 3p. Liberum Capital put the boot in, downgrading to hold from buy and slashing its target price to 160p from 210p. The broker cited increasing competition in the luxury goods market, particularly shoes. It slashed its earnings forecast for 2015 and 2016 but believes Choo’s brand strength in the US and Europe, and growing strength in Asia underpins a sound long-term strategy with white space in which to grow. Profit-taking following strong interim results left Workspace 5p cheaper at 925p. The provider of flexible office space in London reported a 65 per cent leap in trading profits to £20.4m and a 25 per cent hike in the dividend to 4.86p. Total net rental income rose 28.7 per cent to £35.9m. A FinnCap sell recommendation dragged Fidessa 38p lower to 1937p. Technology analyst Andrew Darley downgraded to sell from hold and cut his target price to 1750p from £23 as he thinks the 25 times price earnings ratio rating remains eye-watering for a stock with negligible growth since 2011. Gulf Marine Services fell 15p to 95p on talk of a lost contract. The appointment of Guy Millward as chief financial officer from next month failed to excite Imagination Technologies, 2.75p easier at 215.5p. Broker N+1 Singer is a buyer and says Millward was a strong addition to the Advanced Computer Software Group until its sale in mid-2015 and that he should prove to be a good appointment. Software and consulting services provider First Derivatives jumped 87p to 1540.5p after positive interims. Pre-tax profits rose 27 per cent to £4.6m on revenues 44 per cent higher at £53.8m. The dividend rose 52 per cent. It reported a good demand in markets driven by complex and widespread regulatory change with pressure to introduce efficiencies and reduce costs. It is confident it will meet expectations for the full year.