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refractory gold ore

  • US4559209A   Leaching refractory gold ores   Google Patents

    US4559209A Leaching refractory gold ores Google Patents

    A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 MPa. The terminal pH value of the pulp is controlled to be 10 or less than 10.

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  • Gold mineral processing   Hatch Ltd

    Gold mineral processing Hatch Ltd

    Refractory gold ore pretreatment Treatment of refractory gold ore (whole ore and flotation concentrates) has become more prominent since the 1980s, with many gold discoveries often including ores that are wholly or partially refractory.

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  • Gold processing  Britannica

    Gold processing Britannica

    Gold processing, preparation of the ore for use in various products. Native gold is the most common mineral of gold, accounting for about 80 percent of the metal in the Earths crust. It occasionally is found as nuggets as large as 12 millimetres (0.5 inch) in diameter, and on rare occasions

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  • John T. Boyd Company  Refractory Ore Specialist

    John T. Boyd Company Refractory Ore Specialist

    Refractory Ores. It is well known throughout the mining industry that direct leaching gold deposits are becoming far less common and that the percentage of gold produced from refractory ore deposits will continue to increase for the foreseeable future.

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  • Diagnostic Leaching for Refractory Gold Ores   SRK

    Diagnostic Leaching for Refractory Gold Ores SRK

    A diagnostic leach test can be very useful to qualitatively assess how gold occurs within the ore and the extent to which it may be refractory. Several different permutations of diagnostic leach tests depend on specific objectives, but they generally involve the sequential leaching of a gold ore sample with progressively stronger reagents, producing a qualitative assessment of the gold

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  • Refractory Gold  Mining  SGS

    Refractory Gold Mining SGS

    Also, grinding the ore to an extremely fine particle size can liberate gold encapulsated in sulfides. SGS has very extensive experience with all the unit operations involved in the processing of refractory gold ores, and in selecting the optimum flowsheet for a particular ore. Our gold metallurgy expertise is second to none. Chemical interference

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  • Processing of refractory gold ores   ScienceDirect

    Processing of refractory gold ores ScienceDirect

    More ore bodies have been found where the gold is not amenable to simple cyanidation alone, and low recoveries have resulted from metallurgical testwork. In the simplest of terms these are refractory ore bodies. Reasons for ores being refractory will be highlighted.

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  • Microbial Pretreatment of Refractory Gold Ore   Xinhai

    Microbial Pretreatment of Refractory Gold Ore Xinhai

    Gold ore which is difficult to concentrate often referred to gold or refractory gold ore, which use conventional cyanide process cannot effectively extract most of the gold ore. Therefore, it is commonly said that the treatment of gold is the case of the cyanide method.

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  • Refractory ore trouble Russian gold miners   Mining South

    Refractory ore trouble Russian gold miners Mining South

    Refractory ore trouble Russian gold miners . Nowhere is this problem of complex ore more prevalent than in Russia, where approximately 80% of gold reserves are refractory or partly so, according to figures from Petropavlovsk PLC.

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  • Commercial heap biooxidation of refractory gold ores

    Commercial heap biooxidation of refractory gold ores

    Carlin type ore is typified by microscopic or dissolved gold disseminated in pyrite, arsenopyrite, or arsenian pyrite hosted within carbonaceous sediments. Concerns regarding increasing sulfide content in Gold Quarry ore at that time justified an examination of biooxidation as an alternative processing strategy for low grade refractory ore. 2.

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  • Refractory Gold Ore Treatment Methods

    Refractory Gold Ore Treatment Methods

    Where gold is associated with arsenic, antimony, tellurium, and certain other minerals, it is often only partly soluble in cyanide solution. The difficulty is usually more of a physical than a chemical one but special methods of treatment may be required.

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  • Mach Reactor  Gold Ore

    Mach Reactor Gold Ore

    The MACH REACTOR is particularly suited to pre oxidation and boosted leach applications in gold plants. EFFECT OF MACH REACTOR ON LEACH KINETICS AND RECOVERY. MACH REACTOR technology also finds application in the proprietary Gold Ore Hexate Refractory Gold Process Gold Ore Hybrid Detox

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  • treatment of refractory gold ore   perkinspreschool

    treatment of refractory gold ore perkinspreschool

    Dec 30, 20170183;32;Processing of refractory gold ores ScienceDirect. This paper will review some of the existing techniques and operations that are being used for the treatment of refractory gold ores, with particular emphasis on

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  • Process for treating refractory gold ores by roasting

    Process for treating refractory gold ores by roasting

    Microscopic gold inclusions in sulfide minerals cannot typically be extracted by conventional cyanidation. The gold ore must be pretreated to oxidize sulfide minerals associated with gold and to remove other minerals and chemical compounds that interfere in the cyanidation leaching process.

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  • Roasting and Refractory Gold Ore   MGS Precious Metals Blog

    Roasting and Refractory Gold Ore MGS Precious Metals Blog

    As we have discussed previously on this blog, gold cyanidation can be a very effective means of extracting gold from mined ore. However, the process is ineffective for refractory gold ores which are made up of sulfide minerals that block the cyanide solution from leaching the gold out of the ore.

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  • A Breakthrough For Chinese And Russian Gold Miners

    A Breakthrough For Chinese And Russian Gold Miners

    However, there is a lot of gold and silver in the massive Russian land expanse and if miners can ship refractory ore to China at AISCs lt; $600 per ounce, then this could have important implications.

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  • ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

    ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

    Refractory gold ores present a number of problems to the gold producer. Much has been written about the suitability of particular pretreatment processes for specific gold ores. We at Hazen Research have had the opportunity to participate in the development and application of

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  • The reasons of gold refractory, Gold ore classification

    The reasons of gold refractory, Gold ore classification

    The reason of the gold mineral refractory There are so many types of reasons that caused the difficulty of gold ore processing, including physical element, chemical element, and mineralogical element.

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  • pressure oxide technology to process refractory gold ore

    pressure oxide technology to process refractory gold ore

    pressure oxide technology to process refractory gold ore Oxy hydrogen Flame Manual Ampoule Glass Sealing Ampoule . Working Pressure kg/cm2, 1.3, 1.3 Does not generate hydrocarbons, carbon monoxide, or carbon dioxide.

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  • Recovery Refractory Resources   sgs

    Recovery Refractory Resources sgs

    refractory gold ore is gold containing ore that is resistant to recovery by direct cyanidation and carbon adsorption processes. More specifically, it is an ore that has a gold recovery rate of less than 80% when direct cyanidation is applied to it. Dr Chris Fleming, senior metallurgical consultant at

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  • MICROBIAL PRE TREATMENT OF DOUBLE REFRACTORY

    MICROBIAL PRE TREATMENT OF DOUBLE REFRACTORY

    In this study, microbial pre treatment of double refractory gold ore (sample A) and concentrate (sample B) was investigated using a white rot fungus, Tramestes versicolor (ATTC 20869). Pulp density, temperature, pH and retention times were the process variables considered.

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  • ALTA Gold 2012 E Doc   albionprocess

    ALTA Gold 2012 E Doc albionprocess

    ore reserves. Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either through the presence of naturally occurring preg robbing carbonaceous materials or gold

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  • Refractory ore trouble Russian gold miners   Mining South

    Refractory ore trouble Russian gold miners Mining South

    Refractory ore trouble Russian gold miners . Nowhere is this problem of complex ore more prevalent than in Russia, where approximately 80% of gold reserves are refractory or partly so, according to figures from Petropavlovsk PLC.

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  • Processing Refractory Gold   Hydrometallurgy Leaching in

    Processing Refractory Gold Hydrometallurgy Leaching in

    Refractory ores are normally have either a high sulfide content that masks the gold preventing cyanide leaching of the gold, or high organic content that also block gold leaching (reabsorbs the gold), or it can have a high clay content that also soaks up the cyanide.

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  • Chemical Used in Gold Mining   quot;Refractory Gold orequot;

    Chemical Used in Gold Mining quot;Refractory Gold orequot;

    Chemical Used in Gold Mining Refractory Gold Ores The gold also occurs as sub microscopic particles in sulphides or as absorbed gold onto surfaces of carbonaceous matter. Because of the variation of these refractory ores, gold occurrence is ore specific and before process decisions are made, competent mineralogical and metallurgical

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