Download or read book A Mineralogical Investigation of Refractory Gold Ores and Their Beneficiation written by Peter Michael Swash and published by . This book was released on 1986 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Mineralogical Investigation of Refractory Gold Ores and Their Beneficiation written by and published by . This book was released on 1986 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: A mineralogical investigation of the main causes of refractoriness of metallurgically complex gold ores in South Africa is reported. It is suggested that this refractoriness is related to the presence of submicroscopic gold, carbonaceous material, pyrrhotite, and base-metal sulphides. Means by which problems in the beneficiation of these ores can be overcome were also investigated, and some possible solutions to these problems are offered. A study of beneficiation products from the Fairview Mine showed that submicroscopic gold is associated mainly with arsenopyrite, the gold content of which can be up to 2700 g/t. During miling of the ore, the grains of arsenopyrite, which are smaller than 150 um and have a low resistance to attrition, are selectively broken down. The response of the ultrafine sulphide particles to flotation is relatively poor, and they are preferentially lost to the final tailings together with the gold they contain. It is suggested that the overgrinding of auriferous sulphides can be minimized by the removal of the coarse sulphides from the comminution circuit by flotation or gravity separation. At high rates of aeration in the scavenger and cleaner flotation cells, ultrafine gangue and pyrrhotite are selectively recovered. This material may be recirculated and build up in the flotation circuit, where it may have a detrimental effect on the flotation of the sulphides. Hence, if the amounts of these components can be minimized, the recovery of the gold and the sulphides in these refractory ores can be improved. Means by which this might be accomplished are suggested.
Download or read book A Mineralogical Investigation of Refractory Gold Ores and Their Beneficiation with Special Reference to Arsenical Ores written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A mineralogical investigation of the main causes of refractoriness of some metallurgically complex gold ores in South Africa is reported. It is shown that this refractoriness is related to the presence of submicroscopic gold, carbonaceous material, pyrrhotite, and base-metal sulphides. Gold ores can be classified according to their content of these components. Electron-microprobe analysis shows that gold occurs in arsenopyrite and pyrite, the gold contents of which can be up to 2700 g/t. The gold and arsenic contents of these minerals are closely correlated. Furthermore, within zoned arsenopyrite grains, the concentration of gold closely follows that of arsenic. Mossbauer spectroscopy carried out on samples of concentrate from the Barberton area indicates that the submicroscopic gold within the sulphides is in a non-metallic form. The mineralogical examination of beneficiation products is important, since it sheds light on some fundamental aspects of the behaviour of the ore and gangue components during milling and flotation. Such basic information will lead ultimately to a better understanding of the problems in the beneficiation of these ores. Investigations have shown that the overmilling of the auriferous arsenopyrite and the disseminated nature of the sulphide mineralization are the main problems during beneficiation.
Download or read book A Mineralogical Investigation of a Refractory Gold Ore and of a Sulphide Concentrate and Calcined Tailing from that Ore written by Jussi Tuomas Ollila and published by . This book was released on 1983 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Gold Ore Processing written by Mike D. Adams and published by Elsevier. This book was released on 2005-12-02 with total page 1077 pages. Available in PDF, EPUB and Kindle. Book excerpt: The gold processing industry is experiencing change. As free-milling and oxide ores become depleted, more complex polymetallic and refractory ores are being processed, coupled with increasing pressure for stricter environmental compliance. Recent years have also seen a steady reduction in mineral processing and metallurgy graduates and a gradual loss of older operating experience. A contribution to documenting current and future best practice in gold ore processing seems timely.The focus of this volume is on advances in current gold plant operation, from conception to closure; chapters also cover innovations at the bench and pilot-scale level that would be expected to find commercial application at some stage. Sufficient coverage is also given to the chemistry and engineering aspects. The general principle behind the structure of the volume is that of flowsheeting based on unit operations and applied to a mineralogical classification of gold ore types. From concept to closure, this book covers all unit operations, mineralogies and processes that are relevant to dealing with today's complex orebodies.Practical experience is vital to the successful development, operation and closure of any operation. The 42 chapters have been contributed by a total of 66 authors and co-authors who are experts from countries spanning the globe, and representing exhaustive practical knowledge covering many disciplines relevant to gold processing.* Current best practice as elucidated by a select panel of experts in the field* Innovations at the bench and pilot-scale level that would be expected to find commercial application at some stage* Mineralogical-based approach to flowsheeting
Download or read book A Mineralogical Investigation of a Refractory Gold Ore and of a Sulphide Concentrate and Calcined Tailing from that Ore written by and published by . This book was released on 1983 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report covers an investigation into the manner of occurrence of gold in an old mine dump of calcined tailings at the Fairview Mine. Previous investigations had not revealed the whereabouts of the gold still present in this dump, which amounts to between 10 and 12 ppm. In the present investigation, in which heavy-liquid separation was combined with X-ray, microscope, and electron-microprobe investigations, it was found that a significant proportion of the gold is adsorbed on carbon, and that a smaller proportion is present in pyrite that escaped complete calcination. An enigma is the occurrence of ferrosilicon, some of which contains gold. Although this study produced new information, a more detailed quantitative investigation is required in which an image analyser should be used to provide reliable quantitative data.
Download or read book Investigation of Refractory Gold Ores Examination of the Ore from Golden Hill Mine Barberton District written by and published by . This book was released on 1965 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ore from the Golden Hill Mine is a refractory ore in that less than 8 per cent of the gold can be extracted by conventional cyanidation. Mineralogical examination has shown that over 99 per cent of the gold is included in the sulphide minerals, in particular in the pyrite. The average particle size of the gold is small, being 7 by 5 microns. Chemical tests have shown that there are two causes for the refractoriness of this ore: (1) Lock-up of the gold in the sulphidic minerals. (2) Precipitation of the gold from solution by the carbon present (0.6 per cent) in the ore. Good extractions (96 per cent) of the gold could be obtained only after roasting a sulphide concentrate of this ore before cyanidation. This is the only method of treating this ore that has been effective to date. The conditions and results of all tests conducted on this ore are given in an appendix.
Download or read book Gold Ore Processing written by Mike D. Adams and published by Elsevier. This book was released on 2016-05-03 with total page 1050 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gold Ore Processing: Project Development and Operations, Second Edition, brings together all the technical aspects relevant to modern gold ore processing, offering a practical perspective that is vital to the successful and responsible development, operation, and closure of any gold ore processing operation. This completely updated edition features coverage of established, newly implemented, and emerging technologies; updated case studies; and additional topics, including automated mineralogy and geometallurgy, cyanide code compliance, recovery of gold from e-waste, handling of gaseous emissions, mercury and arsenic, emerging non-cyanide leaching systems, hydro re-mining, water management, solid–liquid separation, and treatment of challenging ores such as double refractory carbonaceous sulfides. Outlining best practices in gold processing from a variety of perspectives, Gold Ore Processing: Project Development and Operations is a must-have reference for anyone working in the gold industry, including metallurgists, geologists, chemists, mining engineers, and many others. - Includes several new chapters presenting established, newly implemented, and emerging technologies in gold ore processing - Covers all aspects of gold ore processing, from feasibility and development stages through environmentally responsible operations, to the rehabilitation stage - Offers a mineralogy-based approach to gold ore process flowsheet development that has application to multiple ore types
Download or read book Investigations on Refractory Gold Ores written by H. W. Mcculloch and published by . This book was released on 1963 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Investigation of Refractory Gold Ores Examination of the Ore from the New Consort Mine Barberton District written by and published by . This book was released on 1965 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ore from the New Consort Mine was submitted to the Laboratory as one of a number of refractory gold ores from the Barberton district. The results of conventional cyanidation tests and roasting tests carried out in the laboratory led to the conclusion that the sample of ore received is not in fact refractory, because extractions of approximately 96 per cent of the gold have consistently been obtained by conventional cyanidation techniques. This result is in agreement with the predictions of a mineralogical examination carried out in the Laboratory. The results obtained indicate further that roasting before cyanidation, which is the treatment at present given to the ore at New Consort, is, in fact, detrimental to gold extraction.
Download or read book Bioextraction and Biodeterioration of Metals written by Christine C. Gaylarde and published by Cambridge University Press. This book was released on 1995-05-11 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research in metal-microbe interactions is reviewed, for researchers and engineers.
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 A Mineralogical Examination of an Antimony bearing Gold Ore and Its Beneficiation Products written by Peter Michael Swash and published by . This book was released on 1986 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Mineralogical Examination of an Antimony bearing Gold Ore and Its Beneficiation Products written by and published by . This book was released on 1986 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the ore and beneficiation products from the Consolidated Murchison Mine, aurostibite is found either as naturally occurring inclusions within antimony-rich minerals, or as synthetic reaction rims, which form round grains of gold that are roasted in intimate contact with antimony-bearing minerals. These particles can have a poor response to flotation and a low rate of dissolution during cyanidation. An examination of samples of the final flotation tailings indicated that losses of antimony and gold occur mainly in the size fraction smaller than 25 micrometers. Further antimony is lost as middlings particles and as free particles of berthierite and stibnite, which may be coated with antimony oxide. The use of gravity-separation methods is recommended to maximize the recovery of gold and antimony. These methods will : (i) remove antimony minerals from the plant circuit as early as possible, thus preventing over-grinding, and (ii) remove any grains of free gold from the sulphide gravity and flotation concentrate, thus minimizing the formation of gold-antimony alloy.
Download or read book Biomine 93 written by and published by . This book was released on 1993 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Chemistry of Gold Extraction written by John Marsden and published by SME. This book was released on 2006 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extensively revised and updated, this edition provides the broad base of knowledge required by all working in the gold extraction and gold processing industries. It bridges the gap between research and industry by emphasizing practical applications of chemical principles and techniques.
