sulphide gold ore processing

Bacterial heap leaching of refractory gold/sulphide ores

Low-grade refractory sulphide gold ores exist in which the gold values are too low to economically justify the use of pre-concentration processes The pre-concentration process (usually flotation) is followed by the oxidation of the sulphidic concentrate to render the gold amenable to a subsequent cyanide leach Oxidation

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Glossary Eldorado Gold Corporation

A whitish to steel gray coloured arsenian mineral (FeAsS) Au Gold Australasian Code The Australasian Code for Reporting of Identified Mineral Resources and Ore Reserves autoclave The equipment used in an oxidation process in which high temperatures and pressures are applied to convert refractory sulphide

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Gold extraction - Wikipedia

Recovery from solution typically involves adsorption on activated carbon then stripping (eluting) the gold from the carbon and passing the pregnant solution through electrowinning and then onto the smelting process Froth flotation is usually applied when the gold present in an ore is closely associated with sulfide minerals

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Sulphide Gold Ore Treatment by Leaching and Flotation Process

Jan 11, 2018 Problem with gold recovery from sulphide ore: How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return This latter point is most important In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all

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evaluating process options for treating some refractory ores abstract

'locked' in sulphide minerals The majority of gold ores are classified refractory because the gold mineralogy is contained in sulphides This type of gold is typically very fine gold or locked in solid solution within sulphide minerals pyrite and arsenopyrite (FeAsS) The arsenic bearing pyrite is commonly known as arsenian

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Gold extraction - Wikipedia

Recovery from solution typically involves adsorption on activated carbon then stripping (eluting) the gold from the carbon and passing the pregnant solution through electrowinning and then onto the smelting process Froth flotation is usually applied when the gold present in an ore is closely associated with sulfide minerals

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Metals extraction strikes gold IOM3

Oct 1, 2008 Sample of a sulphide ore containing gold A sulphide reduction process (SRP) that enables 'fast and cheap' extraction of gold from sulphide ores is available from Haber Inc, based in Arlington, USA Most gold extraction uses toxic chemical leaching involving mercury or cyanide The SRP approach does

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Process to Recover Gold from Sulfide Ores - GOLD PROSPECTING

This subject is a little off the topic of this website but I'm trying to get some feedback on a technology I have been working on the past few years that was focused on remediation of toxic waste I believe it has an application to recover gold from sulphide ores by eliminating the current roasting requirements to

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Bacterial heap leaching of refractory gold/sulphide ores

Low-grade refractory sulphide gold ores exist in which the gold values are too low to economically justify the use of pre-concentration processes The pre-concentration process (usually flotation) is followed by the oxidation of the sulphidic concentrate to render the gold amenable to a subsequent cyanide leach Oxidation

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Preg-robbing phenomena in the cyanidation of sulphide gold ores

Dec 1, 2017 Pyrite was also strongly preg-robbing, and in cyanide deficient solutions adsorbed the majority of the gold in preference to activated carbon The degree of adsorption onto the ore or the activated carbon was a function of the kinetics of the adsorption process The role of the cyanide complexes of copper,

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How do i separate gold from sulphides without using chemicals or

many years ago I found a litle of that stuff too I mean of sulphates ore concentrates in an abandoned and almost dismantled gold mine processing plant I just put that green yellowish powder in an an old iron pot an roasted it on a camp fire until turned black and magnetic I won't do that any more because generates an awful

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Sulphide Gold Ore Treatment by Leaching and Flotation Process

Jan 11, 2018 Problem with gold recovery from sulphide ore: How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return This latter point is most important In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all

read more +

Pretreatment Process on Refractory Gold Ores with As - J-Stage

But it is easy to form secondary wrapping to reduce leaching rate of gold in the roasting process, and at the same time produces gases of SO2 and As2O3 polluting environment seriously In ores with a high sulphide content this treatment involves the production of sulphuric acid This is an undesirable feature, due to the

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US3174848A - Process for treating high antimonybearing gold ores

A well established method for treating refractory gold ores in which the gold is locked up inside fine sulphides is to treat the sulphide concentrate produced from the ore by an oxidizing roast, followed by cyanidation of the resulting calcine to recover the gold Gold recoveries in the order of 95 are obtained by this method at

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Leachox Refractory and Sulphide Gold Process Maelgwyn

MMS has successfully developed the Leachox Process for the treatment of sulphide gold ores The Leachox process flowsheet can be designed to treat refractory or double refractory ores that contain preg robbers It can also be used to treat standard, non refractory, flotation and gravity concentrates in a more cost

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Pretreatment Process on Refractory Gold Ores with As - J-Stage

But it is easy to form secondary wrapping to reduce leaching rate of gold in the roasting process, and at the same time produces gases of SO2 and As2O3 polluting environment seriously In ores with a high sulphide content this treatment involves the production of sulphuric acid This is an undesirable feature, due to the

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Rcovery of gold in pyritic ores

Much of the referenced studies and case applications discussed in this brief article came from USMB reports, which even after they ceased to exist, still continue to provide some good scientific information to those working in the mining and mineral processing industries Sulfide ores, and pyrites in particular, have caused

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Leachox Refractory and Sulphide Gold Process Maelgwyn

MMS has successfully developed the Leachox Process for the treatment of sulphide gold ores The Leachox process flowsheet can be designed to treat refractory or double refractory ores that contain preg robbers It can also be used to treat standard, non refractory, flotation and gravity concentrates in a more cost

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Arsenic in Gold Processing: Mineral Processing and Extractive

The processing of gold bearing sulphide minerals which contain arsenopyrite and other complex arsenic sulphide minerals results in arsenic containing emissions and effluents which must be given careful consideration in relation to clean air and clean water standards The sources of arsenic and the various process

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ESTABLISHING THE PROCESS MINERALOGY OF GOLD ORES

of refractory gold minerals and locking of submicroscopic gold in sulfide mineral structure etc Gold process mineralogy helps address issues and problems related to gold ore processing It provides useful information on process selection, flowsheet development, recovery improvement and reagent consumption

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Pre-treatment of a refractory gold sulfide ore by means of

Abstract Cyanidation is a relatively simple and cheap technology to treat gold-containing ores However, this process is not completely effective in refractory gold-bearing sulfide ores In the case of very low-grade ores, biooxidation is an attractive alternative pre-treatment to render the gold amenable to extraction

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Process to Recover Gold from Sulfide Ores - GOLD PROSPECTING

This subject is a little off the topic of this website but I'm trying to get some feedback on a technology I have been working on the past few years that was focused on remediation of toxic waste I believe it has an application to recover gold from sulphide ores by eliminating the current roasting requirements to

read more +

Gold recovery from sulphide minerals: a bioprocessing - CiteSeerX

Stirred tank bio-leaching process applied in this work was carried out in a typical procedure described elsewhere (At- tia and El-Zeky, 1989) Where, the key components of the process involve concentration of a ground ore, usually by flotation, followed by oxidation of the gold-bearing sulfides to the required extent in a

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Sulphide Gold Gekko

Because cyanide cannot always leach sulphide-associated gold, regrinding the ore is typically required to expose the free gold for recovery by intensive leaching Critically, the size at which one can efficiently liberate gold from the host mineral of the particle will determine the process to use for optimal gold recovery

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Gold processing Britannica com

Exogenetic gold can also exist as oxidized ore bodies that have formed under a process called secondary enrichment, in which other metallic elements and sulfides are gradually leached away, leaving behind gold and insoluble oxide minerals as surface deposits Endogenetic gold ores include vein and lode deposits of

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Leaching of a gold bearing partially roasted sulphide Laboratory

An usual approach for processing complex refractory gold ores is a pre-oxidation treatment prior the gold leaching step and the most known options are roasting, pressure oxidation and bioxidation6-8 Pressure oxidation is a technology where sulfuric acid can play an important role for oxidising arsenopyrite effectively9-11

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Smelting and Roasting Ores to recover gold, silver and other metals

The process works best when the ore is crushed to small pieces before roasting Additives, such as common rock salt are often added to the mix before it is heated to enhance the reaction of the sulfides Once the ores are fully roasted, and the sulfur is driven off, the extraction of the gold or silver from the ore is not especially

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Gold mineral processing - Hatch

Do they process large, low-grade deposits or look for smaller, often more complex ones in remote, often hard-to-reach locations? To complicate matters further, these ore bodies are often refractory, where the gold is locked within sulphide minerals; or double refractory, in which gold is locked within sulphide minerals and

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Rcovery of gold in pyritic ores

Much of the referenced studies and case applications discussed in this brief article came from USMB reports, which even after they ceased to exist, still continue to provide some good scientific information to those working in the mining and mineral processing industries Sulfide ores, and pyrites in particular, have caused

read more +

Mineral Processing - KCGM

Golden Mile ore is of two main types: weathered oxide ore from near the surface which is free-milling with the gold easy to extract, and sulphide ore in deeper ore bodies where the majority of the gold is locked as inclusions in tellurides and pyrites and is difficult to extract In the sulphide or telluride ore, the gold is chemically

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sulfide gold ore beneficiation - YouTube

May 25, 2016 Any further queries please feel free to contact me at: Email:sales1@frjig com WhatsApp:+86 18037167566 website:, ,

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Characterizing gold in refractory sulfide gold ores and residues

Gold is present in refractory sulfide gold ores mainly in arsenian pyrite and arsenopyrite, where it occurs in both the chemically bonded state and as nano-size Chloridecontaining gold ores can generate soluble gold chlorocomplexes during hydrometallurgical processing and the dissolved gold can be sequestered on the

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Characterizing gold in refractory sulfide gold ores and residues

Gold is present in refractory sulfide gold ores mainly in arsenian pyrite and arsenopyrite, where it occurs in both the chemically bonded state and as nano-size Chloridecontaining gold ores can generate soluble gold chlorocomplexes during hydrometallurgical processing and the dissolved gold can be sequestered on the

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Gold Process Mineralogy - Semantic Scholar

with other minerals; coatings; presence of cyanicides, oxygen consumers, and preg-robbers; presence of refractory gold minerals; locking of submicroscopic gold in sulfide and sulfarsenide mineral structures Gold process mineralogy address all issues related to gold ore processing by the detailed study of an ore or a mill

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Gold recovery from sulphide minerals: a bioprocessing - CiteSeerX

Stirred tank bio-leaching process applied in this work was carried out in a typical procedure described elsewhere (At- tia and El-Zeky, 1989) Where, the key components of the process involve concentration of a ground ore, usually by flotation, followed by oxidation of the gold-bearing sulfides to the required extent in a

read more +

The reasons of gold refractory, Gold ore classification, and

Nov 28, 2016 In the process of cyaniding, gold grain surface contact with cyanide pulp, it may produce sulphide film, peroxide membrane(such as Calcium peroxide membrane), oxide film, Insoluble cyanide membrane, etc And they make the metal surface passivation, significantly reduce the oxidation and the leaching

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Metals extraction strikes gold IOM3

Oct 1, 2008 Sample of a sulphide ore containing gold A sulphide reduction process (SRP) that enables 'fast and cheap' extraction of gold from sulphide ores is available from Haber Inc, based in Arlington, USA Most gold extraction uses toxic chemical leaching involving mercury or cyanide The SRP approach does

read more +

Topic 3: Ore processing and metal recovery - SlideShare

May 17, 2009 Amenable ores are oxidised If not, oxidising bacteria may be used first to decompose sulphide minerals to facilitate the leaching process No fine tailings are generated by heap leaching probably its single most important advantage over conventional vat leaching 15 Heap leaching applied to gold

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US3174848A - Process for treating high antimonybearing gold ores

A well established method for treating refractory gold ores in which the gold is locked up inside fine sulphides is to treat the sulphide concentrate produced from the ore by an oxidizing roast, followed by cyanidation of the resulting calcine to recover the gold Gold recoveries in the order of 95 are obtained by this method at

read more +

Sulphide Gold Gekko

Because cyanide cannot always leach sulphide-associated gold, regrinding the ore is typically required to expose the free gold for recovery by intensive leaching Critically, the size at which one can efficiently liberate gold from the host mineral of the particle will determine the process to use for optimal gold recovery

read more +