Biological pre-oxidation to enhance gold and silver recovery from refractory pyritic ores and concentrates

Abstract Pre-oxidation of refractory pyritic concentrates by biological leaching to enhance the recovery of gold and silver in cyanida-tion has been investigated. The results of laboratory tests on three concentrates are presented. In all cases substantial increases in precious metal recoveries were obtained following the pre-treatment. For one concentrate, gold recovery of 81% was achieved following an 87% oxidation of pyrite, compared with 24% recovery by direct cyanidation of non-oxidized concentrate. Gold and silver recoveries from the other concentrates were increased from the range 60-78% to over 90% and from 80-86% to over 98% respectively. Operating parameters are discussed and methods of maintaining high oxidation rates are evaluated. Methods of employing this pre-oxidation technique in commercial practice are described.
Keywords: Gold extraction, Leaching, Biological leaching, Cyanide leaching, Gold recovery, Silver extraction, Silver recovery, Refractory ores, Porgera concentrate, Cinola concentrate, Ore mineralogy.
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Publication: CIM Bulletin
Author(s): J. ROTH
Keywords: Mineral exploration, Economic geology, Exploration geology, Plate tectonics, Tin-tungsten deposits, Lead-zinc deposits, Sulphide deposits, Gold deposits, Uranium deposits, Porphyry copper deposits
Issue: 857
Volume: 76
Year: 1983
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Summary: The junior mining company's bank account is depleted, but there are high hopes for the company's property. Where to get the necessary development funds is a common problem facing many juniors.
This month, Tax Notes discusses briefly the principal income tax implications of several alternative development plans that are typically available to the junior mining company and its shareholders.
Publication: CIM Bulletin
Author(s): ROBERT B. PARSONS
Issue: 857
Volume: 76
Year: 1983
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Summary: The object of the paper is to discuss the developments in Carbon-In-Pulp (C.I.P.) technology for gold recovery. The CIP process is comprised of four major operations:(a) adsorption of precious metals onto activated carbon;(b) elution (stripping) of precious metals from the loaded carbon;(c) electrowinning of the precious metals from the concentrated eluate;(d) regeneration of the eluted carbon before recycle to the adsorption process
A detailed review of the technological developments in each...
Publication: CIM Bulletin
Author(s): AMYN S. DAHYA, DAVID J. KING
Keywords: Gold processing, Gold recovery, CIP Process, Merrill-Crowe Process, Carbon, Adsorption, Elution, Electrowinning, Zinc precipitation, Acid washing, Thermal reactivation.
Issue: 857
Volume: 76
Year: 1983
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Summary: The regional stratigraphy of the Lower Carboniferous Windsor Group in the Moncton Subbasin indicates that evaporites could be present in the Marysville Subbasin, part of what was formerly called the Central New Brunswick Platform. The Windsor Group consists of basement-fringing, algal build-ups (Gays River Formation), in places with intercalated siliciclastics (Parleeville), which are laterally equivalent to deeper-water, very thin to thinly bedded, euxinic limestone (Macumber). The Macumber...
Publication: CIM Bulletin
Author(s): S.R. McCUTCHEON
Keywords: Potash, Salt, Central New Brunswick Platform, Windsor Group, Moncton Subbasin, Marysville Subbasin, Gays River Formation, Parleeville Formation, Macumber Formation, Upperton Formation, Cassidy Lake Formation.
Issue: 857
Volume: 76
Year: 1983
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Summary: In the 1950s, Canada produced more than ninety-five per cent of the non-communist world's nickel and achieved dominance in terms of production, technology and pricing policies.Over the past thirty years there have been dramatic changes in the nickel industry to the extent that Canadian production is now less than thirty per cent of the total.
In this document we have presented statistics relevant to this transformation and reviewed the technology, particularly with regards to energy and...
Publication: CIM Bulletin
Author(s): E. OZBERK, W.G. DAVENPORT, N. GIBSON
Keywords: Nickel, Nickel production, Nickel industry, Supply, Demand, Extractive metallurgy, Inco Limited, Falconbridge Limited, Sherritt-Gordon Mines Limited.
Issue: 857
Volume: 76
Year: 1983
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Summary: The Superior Province of the Canadian Shield is the largest gold producing area within Archean greenstone rocks in the world, with total production of over 140 million ounces of gold. One hundred and fifty-five mines have individually produced more than 8,000 ounces, although only a relatively limited number of deposits (33) produced more than one million ounces of gold. The output from these 33 deposits accounts, however, for 85% of total gold production. The majority of grades (68%) ranges...
Publication: CIM Bulletin
Author(s): C.H. BERTONI
Keywords: Gold, Gold deposits, Gold production, Superior Province, Canadian Shield.
Issue: 857
Volume: 76
Year: 1983
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Summary: The possibility of spoilpile failure at the Kara Kara bauxite strip mine, Guyana, South America, is of major concern to the mine operators. The current mining technique requires the continuous operation of an 11 m3 bucket capacity walking dragline on top of 18 metres of freshly spoiled uncompacted overburden material consisting of varying mixtures of kaolinitic clay and quartzitic sand. A field biased geotechnical study of undisturbed overburden and corresponding spoiled material has...
Publication: CIM Bulletin
Author(s): H. GEORGE, D.F. VanDINE
Keywords: Spoilpile, Slope stability, Prediction, Shear strength, Dragline, Strip mine, Overburden, Standard Penetration Test, Pull-back, Vane Shear Test.
Issue: 857
Volume: 76
Year: 1983
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