Search Documents

By R. Immele-Meziou, G. J. Long, D. G. C. Robertson, O. A. Pringle

The reduction of naturally weathered ilmenite concentrate occurs in two steps: reduction of Fe3+ to Fe2+, followed by reduction of Fe2+ to Fe. Small amounts of a magnetic phase were also observed and may correspond either to an Fe3O4-FeTiO3 ilmenite phase or to an Fe3O4-Fe2TiO4 spinel phase. The total amount of metallic iron produced after 12 hr was only 50% of the total iron present in the sample.

Jan 4, 1992

By C. A. Pickles

Mixtures of silver chloride and copper chloride are produced during gold refining by the Miller process. A study was carried out into the reduction with iron of a synthetic Miller chloride containing 13.64 mass% Ag and 2.42 mass% Cu. The effects of smelting temperature and time and of additions of iron and borax were investigated. The results were interpreted in terms of metal recovery and quality. Temperature did not have a significant effect on metal recovery above the melting point of the metal product. Borax additions reduced vapour losses and improved metal recovery. With excess iron it was possible to achieve silver recoveries of about 100% and copper recoveries of about 70%. The metal product contained on average 76.1 mass% Ag, 7.5 mass% Cu and 12.8 mass% Fe.

Jan 4, 1993

By J. J. Mackay

The Parliamentary Under-Secretary of State at the UK's Department of Transport introduced the symposium, approved its emphasis on environmental planning and the mitigation of environmental impact, discussed the publicity resulting from the recent opening of the Channel Tunnel as well as the role of private financing, and pointed out the leading role played by the Department of Transport in the introduction of the New Austrian Tunnelling Method to projects such as the Jubilee Line extension and the Heathrow Express (an editor's footnote, however, mentions with regret the Heathrow subsidence that occurred just before the journal went to print)

Jun 16, 1905

By Dean S.

Further discussion at the The Midland Counties Institution of Engineers' general meeting held in Nottingham on 6th May 1916, of the paper published in Trans. I.Min.E., vol.L, 1915, p.179, included brief oral contributions by Bragge G.S., Lewis W.H. and Hepplewhite W.H.

Dec 1, 1916

By G. Richards

Application of the Internet of Things (IoT) technologies - the interconnection of uniquely identifiable embedded computing devices within the existing internet infrastructure - to the mining industry is discussed. IoT technologies are aimed at making projects safer, better optimised and more economic and are applicable to current or new underground or open-pit mines, regardless of size. Two examples are presented of successful implementation of IoT technologies, the Chelopech gold, copper and silver mine in Bulgaria, where production has increased from 500 000 to 2 000 000 tonnes/y and communication costs have been reduced by US $2 500 000 over 2 y, and the Pilbara project in Western Australia, where remotely controlled wirelessly connected autonomous trucks have covered ca. 3 000 000 miles and hauled almost 250 000 000 t of ore since 2008

Apr 1, 2015

By K. M. Kinealy, A. R. Ramsden, D. H. French

A negative correlation exists between sphalerite composition and gold content when gold is transported as Au(HS)2(-); however, there are spatial and temporal differences within a single deposit. A previous model for the formation of volcanogenic massive-sulphide deposits within thermally intensifying and waning hydrothermal sytems in much the same way as is observed around modern sea-floor vents is supported. The results also emphasise that recognition of the mechanisms of gold transport in ancient deposits depends critically on an understanding of their mineralogy and stratigraphy

Jan 1, 1991

It was intended to show a film on Dust Suppression in the South Wales Coal-mines. Unfortunately, owing to a breakdown, only a small portion of the film was shown.

Jan 1, 1947

By P. A. Wright

The note describes the steps involved in the combination of results reported by Shiraishi and Bell in 1968 and 1970 and by Mills and Turkdogan in 1964. Shiraishi and Bell derived from their vapour-pressure measurements an expression for the activity coefficient of tin implying that the miscibility gap in the two-liquid region is symmetrical about the N = 0-5 axis. The limits of the miscibility gap were reported by Shiraishi and Bell and measurements were reported graphically by Mills and Turkdogan. Least-square parabolas are fitted to the transformed results of Shiraishi and Bell and of Mills and Turkdogan for the miscibility gap in the liquid tin-iron system. Back-transformation from these curves gives limits at 1438 K and equations are derived that appear to be a fair average of existing data, although a third term for the activity coefficient equation needs to be investigated

Dec 1, 1971

By D. H. Watkinson

Paper presented at the IAGOD international symposium on mineralisation related to mafic and ultramafic rocks held in Orleans, France, 1-3 September 1993. Part of the contact of the 4b orebody with the enclosing Murray granite is characterised by the presence of recrystallised and biotitic Sudbury Breccia; in places the contact is faulted and sheared. In other areas of the contact partly silicified granite contains disseminated chalcopyrite and quartz-chalcopyrite veins with other minor minerals. Both ore and veins contain platinum group minerals (PGM); predominant PGM are michenerite, kotulskite, merenskyite and sperrylite with Au, galena and Bi-tellurides. At some silicified-granite contacts Mn-rich garnets, some containing inclusions of PGM and quartz, are associated with biotite + epidote + stilpnomelane + quartz. PGM and Au also occur within Cl-rich biotite and ferropyrosmalite in massive sulphide and in siliceous ore. Quartz, chalcopyrite and feldspar in the contact rocks and in veins contain abundant, highly saline fluid inclusions. Studies showed that the fluids were trapped at intermediate temperatures. The 4b orebody is surrounded by a sheath of brecciated granite but is close to the Contact Sublayer. During and after emplacement of sulphide magma, saline formational fluid that was resident in the breccia interacted with hot massive sulphides in and near the Sublayer and remobilised Cu, Au and PGE. This fluid reacted with cooler rocks and ore in footwall fractures, enriching the 4b protore and producing the adjacent Cu- and PGE-enriched quartz veins. Exploration for Cu and PGE enrichment in footwall rocks of the Sudbury South Range is warranted not only in zones of magmatic ore in the Contact Sublayer but also in fractures and permeable units within Sudbury Breccia

Jun 16, 1905

By P. A. Rossouw, G. A. Fourie

The correction to the paper published in Trans. IMM A, vol.105, 1996, p.A162-A165 stresses that figs. 4 and 5 had been interchanged, reproduces them with their correct captions for clarity and encourages readers to comment on the Delft proposal

Jun 19, 1905

By T. Guyaguler

An analytical technique using computer-based multiple-regression methods was employed to determine the relation between the dust-producing index and inherent rock properties of typical samples from a coal-producing area, one of the aims being to provide a preliminary predictive tool for practical use. The investigation demonstrated that factors varied in their influence under different conditions, the brittleness:toughness ratio and the hardness being the most significant inherent properties with hardness showing the highest positive correlation coefficient

Jun 13, 1905

By I. Garba

The Bin Yauri deposit in the Zuru schist belt of northwestern Nigeria is a vein-type quartz-sulphide-carbonate gold mineralisation hosted by a brittle fault zone. The occurrence of the mineralisation in a contact zone of a Pan-African granitoid was believed to be sufficient evidence of deposition from magmatic fluids. However, studies may now indicate a metamorphic source for the mineralising fluids. A study of rare earth element geochemsitry was used to investigate the nature of the fluid-rock processes involved and identify the sources of the auriferous mineralising fluids.

Jan 12, 1992

By D. L. Buchanan, ed. sci.

The issue comprises 10 contributions on PGE mineralisation, of which 9 were presented at the symposium organised by the IAGOD Commission on Ore Deposits in Mafic and Ultramafic Rocks and the BRGM-CNRS University of Orleans research group. The editor's introduction and summary of the papers is presented together with the title page, contents list and cover photograph of a harzburgite ridge, dunite boundary and chromite quarry in the Shetland ophiolite on Unst

Apr 1, 1994

By T. D. Jones

Describes the facilities in South Wales for routine control and research work on all the various aspects of the dust problem. Considers mining and medical research, inspection and control, education, and plans for the future.

Jan 1, 1947

By M. J. Matos, W. Patruk

The correct version of Equation 1 is represented and Tables 3 and 6 are revised to consider all size fractions, including those coarser than 300 micrometres, in calculating the total liberation from King's fractional liberation

Jun 18, 1905

By P J. Borrington

Offering 1000 hour salt spray protection, the KEYCOAT 1000 coating presents no chipping, cracking or deformation when hammered or flexed through 90 degrees or more. This cost-effective metal protection system features lubrication performance equal to molybdenum disulphide and Poly Tetra Fluoro Ethylene (PTFE) grease providing complete anti-seize protection whilst aiding assembly and disassembly. In addition, the coating is impervious to acids, alkalis, solvents and attack by oils and all fuels. KEYCOAT 1000 has been exhaustively tested in three main industry sectors - automotive, heavy earthinoving vehicles and chemical - where it lias been proven to outperform conventional systems in all respects and as the film formed is less than one thousandth of an inch thick (typically 20 microns), it rarely presents the engineer with any tolerance difficulties. KEYCOAT 1000 is one of a w ide family of products which offer protection and lubrication to a wide industry base, from aerospace to food and with temperatures ranging from minus 190 C to plus 30 C.

Jan 4, 1997

By T. Guerin

More than 370 million litres of oil leak from hydraulic equipment every year, excluding all other sources of plant fluid losses. This item analyses the causes of fluid spills from plants and equipment on resource construction sites, and offers some possible solutions.

Apr 1, 2015

By Black J.

Further discussion at the Mining Institute of Scotland's general meeting held in Edinburgh, 12 February 1916, with D.W. Mowat, president, in the chair, of a paper published in Trans. Inst. Min. Engrs., 1915, vol. L, p.449 included written contributions by Dron R.W., Riddell W., Hamilton J. and Mowat D.W.

Dec 1, 1916

By G. Richards

Following on from the article in Materials World February 2015 (Asset 997) this article is the second half of a special focus on graphite. It looks at graphite's market prospects over the next few years. Natural graphite is used in refractories, which accounts for ca. 20% of global demand and is forecast to grow by 2-4%/a to 2020, while the largest growth in demand (increases of 10-15%/a) is estimated to come from its application in anodes for lithium-ion batteries, especially those in hybrid electric vehicles. High-grade natural graphite deposits that are either coming back on stream or are in the pipeline are discussed including Woxna mine in Sweden, Bissett Creek project in Ontario, Canada, Balama mine in Mozambique and Lac Knife project in Quebec, Canada

Mar 1, 2015

By E. A. Brocchi, P. K. Jena

Complete extraction of copper from Salobo chalcopyrite concentrate can be achieved in less than 10 minutes by chlorination of the dry concentrate with Cl2 at 450 degrees C and in 5 minutes by chlorination of an aqueous slurry containing 5 wt% concentrate at 30 degrees C. In general, slurry chlorination appears to be faster than dry chlorination. The kinetics of dry chlorination of copper sulphide are controlled by an adsorption mechanism with an activation energy of 6.1 kcal/mole. The rate is independent of chlorine partial pressure when pCl2 exceeds 0.4 atm. In slurry chlorination the dissolution of copper sulphide follows a topochemical reaction model and the rate of chlorination decreases with increase in pulp density and also temperature. Dissolved chlorine appears to take part in the reaction in atomic or ionic form.

Jan 4, 1992