Download or read book Mineralogy and Chemical Behaviour of Some Refractory Gold Ores from the Barberton Mountain Land written by and published by . This book was released on 1966 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: The object of this project was to investigate certain aspects of the problems relating to gold extraction that have forced many small mines in the Barberton Mountain Land, Eastern Transvaal, to close down, mainly because the unoxidized ores have not responded to the conventional methods of treatment. The results of a detailed mineralogical examination of ores from sixteen localities in the area are followed by a brief literature survey on the nature of refractory gold ores and their treatment. The ores considered include the present chief gold producers - those from the Agnes, Fairview, New Consort, and Sheba Mines. The following fifty five ore minerals are present, gold being associated with twenty five of them: Ankerite, native antimony, argentite, arsenopyrite, berthierite, metallic bismuth, bornite, bournonite, chalcocite, chalcopyrite, chloanthite-skutterudite (types 2 and 3), chromite, cobaltite, native copper, corynite, covellite, cubanite, electrum, enargite, famatinite, franklinite, galena, graphite, goethite, native gold, hematite, ilmenite, jamesonite, lepidocrocite, leucoxene, linnaeite, loellingite, magnetite, malachite, marcasite, maucherite, melnikovite-pyrite, millerite, molybdenite, neodigenite, niccolite, pentlandite, pyrite, pyrrhotite, safflorite, siderite, native silver, sphalerite, stibnite, tetradymite, tetrahedrite, (two types), trevorite, and ullmannite. The paragenesis of these minerals is discussed briefly. An attempt was made to correlate the mineralogical properties of some of the ores with their expected behaviour. Chemical processing tests carried out included conventional cyanidation, dilute leaching, cyanidation in the presence of kerosene, and cyanidation of roasted ores. The results obtained showed that, in general, the agreement between the predicted and the actual figures for gold extraction was reasonably good. Explanations are given for discrepancies between these values. The chief cause of the refractory nature of the gold ores from the Barberton Mountain land was found to be the locking of gold particles in sulphide minerals, mainly pyrite and arsenopyrite. Other important causes are the precipitating effect of carbonaceous material, the presence of pyrrhotite, and the presence of unusual alloys of gold, which exhibit a pinkish tinge in polished section and may be refractory to cyanide solutions. The results of preliminary investigations of this 'pink' gold by an electron microprobe are included. The best extraction results for most ores from the area are generally obtained by leaching roasted sulphide concentrate.
Download or read book Mineralogical Features of Gold Ores in South Africa written by and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Gold in the Witwatersrand System is discussed with respect to geological aspects, a macroscopic description of the conglomerate, mineral composition of the conglomerate, occurrence and composition of the gold, distribution of gold and heavy minerals, chemical composition of gold, refractory properties of the ores, and genesis of the gold. Gold in the Barberton Mountain Land is considered in terms of geological aspects, gold production, mineralogy of the ores, composition of the gold, paragenesis of the ore minerals, and refractory properties of the ores and their treatment.
Download or read book The Metallogeny of the Barberton Greenstone Belt South Africa and Swaziland written by J. H. W. Ward and published by . This book was released on 1996 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geochemical Studies written by Bozzano G Luisa and published by Elsevier. This book was released on 2012-12-02 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geochemical Studies is a collection of papers dealing with ore petrology, particularly on the genesis of ores found in sediments. One paper describes the minor elements in metal deposits in sedimentary rocks, focusing on geochemical work on certain classes of ores in sediments and on the theories of origin of the deposits. With better techniques of microprobe analysis of trace elements, the paper notes that ore deposits in sedimentary rocks can be characterized by their minor element suites. One paper points out that large ore deposits cannot possibly be formed by a migration of substances (known as "negative" diffusion). The paper estimates that the quantities of material that can be accumulated in a sediment horizon with a great affinity for these materials, say in a period of one billion years, will still not be sufficient to produce a large ore deposit. The paper estimates the necessary diffusion coefficients that occur in deep structures, where increased mobilities of various substances occur. Geologists, geochemists, and engineers working with fossil fuels will find the collection highly significant.
Download or read book Geological Survey Professional Paper written by and published by . This book was released on 1981 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gold written by Nathaniel Arbiter and published by CRC Press. This book was released on 1990 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: The eight articles first appeared as volume 6 (no date) of Mineral processing and extractive metallurgy review. They review new methods of recovery for gold, and to some extent, silver, focus on the particular challenges of extraction from carbonaceous ores and from various sulfide-bearing ore, and the treatment of refractory gold ore, and discuss high-temperature and biological oxidation, high- temperature chlorination, and removing metals from leach liquor. Book club price, $40. Annotation copyrighted by Book News, Inc., Portland, OR
Download or read book Supergene Gold Enrichment in the Barberton Mountain Land with Particular Reference to the Lily Mine written by C. R. Anhaeusser and published by . This book was released on 1966 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Professional Paper written by Geological Survey (U.S.) and published by . This book was released on 1981 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Geological Survey Professional Paper written by and published by . This book was released on 1980 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book S A Geology and Mineralogy for Metallurgists written by and published by . This book was released on 1983 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Scientific Bibliography of the Far Northern Drakensberg written by Rodney Moffett and published by UJ Press. This book was released on 2023-04-14 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Scientific Bibliography of the “Far Northern Drakensberg” is a continuation by the Afromontane Research Unit of the University of the Free State (ARU) to document published and other similar works on the mountains of the summer rainfall area of South Africa. It follows “A Scientific Bibliography of the Drakensberg, Maloti and Adjacent Lowlands” which was published in 2020 (Moffett 2020), and which covered the area between the North-Eastern Cape and the North-Eastern Free State. The current work extends this northward by including articles and publications dating back to 1875 (E.Cohen, on the Lydenburg goldfields) reaching as far as the Wolkberg and Woodbush near Tzaneen in Limpopo Province. Figure 1 shows the boundary of the area covered, and although referred to as the Far Northern Drakensberg in this work, it is identical to that described as the LMEE, Limpopo, Mpumalanga & Eswatini Escarpment by Clarke et al (2022). Although slightly separate from the “lower” escarpment, the mountainous Barberton and adjacent Eswatini area, as well as the Leolo Mountains in eastern Sekhukhuneland are also included. Details on how the boundary in figure 1 was determined are given in Clark et al (2022). Bibliographies on two further ranges in the summer rainfall area, viz. the Magaliesberg in Gauteng province and the Soutpansberg in Limpopo province are to be the subject of future compilations.
Download or read book Geology and Mineralogy of the Principal Goldfields in South Africa written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This chapter gives a very comprehensive account of the South African goldfields, starting with a summary of the history of gold in South Africa and ending with 145 references. As pointed out, a total of 39 849 502 kg of fine gold was produced in South African mines up to the end of June 1985. This includes the production from gold mines in the Barberton Mountainland, mines extracting gold as a byproduct, and small mining corporations, which together contributed about 1 per cent of the total gold output. If the gold production for the second half of 1985 is taken at 320 000 kg of fine gold, the total output of gold for the period 1884 to 1985 surpassed 40 million kg of fine gold. The geology of the sediments in the Witwatersrand Triad is detailed, special attention being paid to the placers, which are the dominant gold-bearers, to the nature and mode of occurrence of the gold, to the distribution of the gold and heavy minerals, and to the chemical composition of the gold. As a small amount of the gold is not extracted by the processes of gold recovery currently practised on the Witwatersrand (0,1 to 1,0 g/t from a gold content of 5 to 15 g/t), attention is paid to the gold in the residues, which consists of gold enclosed by other minerals, or coated gold, thus shielded from contact with the lixiviant; gold dissolved during leaching then adsorbed by other minerals or by extraneous matter in the mill pulp; large gold particles incompletely dissolved when the residence time in the lixiviant was inadequate; or incompletely dissolved grains as a result of galvanic interaction between gold in contact with certain minerals, causing a decrease in the dissolution rates. Apart from the gold and silver minerals, other minerals of economic importance in these ores are uranium-bearing constituents, platinum-group minerals and cobalt-bearing and nickel-bearing sulpharsenides, and abundant pyrite (used for the production of sulphuric acid). In the current economic climate, they cannot be exploited on their own but are valuable byproducts of the gold. The gold of the Barberton Mountainland is described in a similar way, an account being given of the geological setting, the distribution and ore genesis of the gold mineralization, the mineralogical characteristics of the gold ores, and their refractory nature and treatment. The chapter is illustrated by seven line drawings and 24 photomicrographs. It also contains numerous tables.
Download or read book Unrestricted Mintek Publications written by and published by . This book was released on 1966 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book School Mineralogy for Minerals Processing written by and published by . This book was released on 1992 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book SME Mining Reference Handbook 2nd Edition written by Heather N. Dougherty and published by Society for Mining, Metallurgy & Exploration. This book was released on 2020-02-01 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt: The go-to resource for professionals in the mining industry. The SME Mining Reference Handbook was the first concise reference published in the mining field and it quickly became the industry standard. It sits on almost every mining engineer’s desk or bookshelf with worn pages, tabs to find most used equations, and personal notes. It has been the unequaled single reference and the first source of information for countless engineers. This second edition of the SME Mining Reference Handbook builds on that success. With an enhanced presentation, new and updated information is represented in a concise, well-organized guide of important data for everyday use by engineers and other professionals engaged in mining, exploration, mineral processing, and environmental compliance and reclamation. With its exhaustive trove of charts, graphs, tables, equations, and guidelines, the handbook is the essential technical reference for mobile mining professionals. With its exhaustive trove of charts, graphs, tables, equations, and guidelines, the handbook is the essential technical reference for mobile mining professionals.
Download or read book Quarterly News Bulletin written by Geological Society of South Africa and published by . This book was released on 1965 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
