of refractory sulphide gold ores and concentrates

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of refractory sulphide gold ores and concentrates

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 Refractory pre treatment processes include pressure oxidation biological oxidation and various forms of.

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Potential pre treatment and processing routes for recovery

2.1 Microwave pre treatment of refractory gold ores Most of refractory gold occurs within sulphide minerals such as FeS 2 and FeAsS and are treated by roasting pressure leaching or bacterial leaching to render the gold amenable to recovery by

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Atmospheric alkaline pre oxidation of refractory sulphide

Four iron sulphide containing gold ores from the White Mountain mine in the Jilin Province China were studied to examine the benefits of using oxidative treatment prior to conventional cyanidation to leach gold This pre treatment consisted of bubbling air into an ore/water mixture for eight hours while adding enough caustic sodium hydroxide to maintain a pH of 11

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gold processing plant for sulphide ores

Of Refractory Sulphide Gold Ores And Concentrates Refractory gold ores in Archaean greenstones Western Australia Ora Banda sulphide ore has been blended with oxide and other ore sources before processing in a CIL plant sulphide gold ores in difference in

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process for the treatment of refractory gold concentrates

Cyanidation and concentration of gold and silver ores List Gold Refractory Process Methods The use of roasting for the oxidation of sulfides has declined over the years However Resolute Mining resurrected the Syama project in Mali by converting the process from a whole ore roast to flotation followed by concentrate roasting Read More

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sulphide gold ore processing

Apr 01 2021 Basically refractory gold ores gold recovery efficiency of 50 in average using direct cyanidation are classified into sulfide tellurium and carbon ores Sulfide gold ores account for a large proportion of refractory gold ores therefore it is very meaningful to recover gold from sulfide gold ores Ubaldini and Vegliò 2000 Saba 2011 Hammerschmidt 2016 .

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ALTA MetBytes

refractory sulphide gold ores and concentrates under atmospheric pressure without ultrafine grinding and at temperatures much lower than traditional roasting or autoclave pre treatment 14

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Bio oxidation of Arsenopyritic and Pyritic Containing Gold

The oldest and best understood is gold locked in sulphide and most frequently pyrite The second contributor to refractory behaviour is arsenic which causes high refractoriness even at low concentrations The presence of carbon in the ore is also a frequent cause of poor recovery.

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Effect of Pretreatment of Sulfide Refractory Concentrate

Keywords Refractory Gold Concentrate Hypochlorite Ox idation Pretreatment Pressure Cyanidation 1 Introduction 1.1 Background Many of the gold deposits contain finely disseminated gold in iron sulfide minerals such as pyrite and arsenopy rite Such deposits are called refractory gold ores due to

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Kibali Gold Mine sulphide concentrate treatment

1 Kibali Gold Mine sulphide concentrate treatment Understanding the pre oxidation of sulphide concentrates T Mahlangu1 F A Sumaili2 D.N Ayizi3 B.M Sindani4 and P Mande5 and M Verster6 1 Projects Metallurgist Kibali Gold Mines 4239 Avenue Tombal Baye 3eme Etage de l Immeuble Le

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gold sulphide ores

Gold–sulphide deposits of the Russian Arctic zone The ores distributed in gold–sulphide type deposits were conditionally classified into two types 1 low sulphide vein disseminated ores that are difficult to dress containing invisible native gold and increased silver content and 2 low sulphide–quartz veins with free native gold.

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GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES

reagent on cyanidation of refractory gold ore Cyanide leaching of the concentrate was performed at 20 w/w of solid 500 gram of refractory sulfide gold ore concentrate in a 2.5 liter glass reactor with aeration and stirred at 250 rpm Leach solutions were prepared using deionized distilled water at the prescribed concentration of reagents.

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Biooxidation‒thiosulfate leaching of refractory gold

21 07 2019  A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated Mineralogical studies on the concentrate showed that very fine gold grains <10 μm were encapsulated in pyrite and arsenopyrite while the proportion of monomer gold was only 21 The gold bearing sample was identified as a high sulfur fine sized wrapped type refractory gold

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Sulphide Gold Ore Processing

Sulphide Gold Ore Processing High sulfide gold ore refers to a certain gold ore with 20 30 of gold wrapped by sulfide mainly pyrite Because most of the gold in high sulfide gold ore exists in the form of sulfide encapsulated gold when using direct leaching process the consumption of gold leaching agent and cost of gold leaching production will increase and gold processing

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Specific Refractory Gold Flotation and Bio Oxidation

refractory sulphidic ores 2 Ore Mineralogy and Physico Chemistry Ore mineralogy coupled with physico chemical characteristics play a critical role in their response to mineral processing and extraction techniques The comprehensive mineralogy and physico chemistry of the two different gold ores alongside their flotation

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PRESSURE OXIDATION OF REFRACTORY GOLD ORES THE

PRESSURE OXIDATION OF REFRACTORY GOLD ORES THE METATES GOLD PROJECT EXPERIENCE By 1Gary Parkison 2Art Ibrado 3Grenvil Dunn 3Nelson Mora and 3Yong Yong Teo 1Chesapeake Gold Corp Canada 2M3 Engineering and Technology USA 3 Orway Mineral Consultants WA Pty Ltd Australia Corresponding Author

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PRESSURE OXIDATION OF REFRACTORY GOLD ORES THE

PRESSURE OXIDATION OF REFRACTORY GOLD ORES THE METATES GOLD PROJECT EXPERIENCE By 1Gary Parkison 2Art Ibrado 3Grenvil Dunn 3Nelson Mora and 3Yong Yong Teo 1Chesapeake Gold Corp Canada 2M3 Engineering and Technology USA 3 Orway Mineral Consultants WA Pty Ltd Australia Corresponding Author

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Pretreatment Process on Refractory Gold Ores with As

1 Introduction Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80 even after fine grinding 1 Arsenic bearing refractory gold ore has stones extremely difficult to deal with In the stones gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.

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sulphide gold ore processing

sulphide gold ore processing High sulfide gold ore refers to a certain gold ore with of gold wrapped by sulfide mainly pyrite because most of the gold in highsulfide gold ore exists in the form of sulfideencapsulated gold when using direct leaching process the consumption of gold leaching agent and cost of gold leaching production will increase and gold processing

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The reasons of gold refractory Gold ore classification

28 11 2016  III Classification of refractory ores 1 Carbonaceous gold ore There is organic carbon which can do Rob gold in gold and silver ore and it causes that gold

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Effect of Pretreatment of Sulfide Refractory Concentrate

The majority of the refractory gold and silver occurs in occlusion in sulphides then precious metal dissolution is possible by first oxidizing auriferous sulfide concentrate using sodium hypochlorite sodium hydroxide solution followed of pressure cyanidation of the oxidized concentrate for the extraction of precious metals This process was conducted and evaluated

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Refractory gold ores Challenges and opportunities for a

23 03 2021  Gold miners are facing a reserves crisis and what is left in the ground is becoming more and more challenging to process.Refractory gold reserves which require more sophisticated treatment methods in order to achieve oxide ore recovery rates correspond to 24 percent of current gold reserves and 22 percent of gold resources worldwide Exhibit 1 .

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Treatment of refractory gold more sustainable gold ounces

19 08 2020  The BIOXprocess designed for the treatment of refractory gold concentrates has been commercially available for over 30 years with a

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Review Pretreatment Process on Refractory Gold Ores with As

refractory gold ore.8 9 Haque K E used microwave to dis pose of arsenical pyrite and gold concentrate with pyrite the gold leaching rate reached 98 .10 Liu Quanjun etc made a test for a gold mine in Guizhou province The ore without micro wave pretreatment could be hardly leached in cya nide On the other hand the cyanide leaching of gold ore

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Leachox Refractory and Sulphide Gold Process

Refractory gold ores are generally defined as those ores that do not give economical recoveries in conventional cyanide circuits where the ore has been ground to around 53 to 75 microns The gold is normally present in refractory gold sulphide ores containing mainly pyrite arsenopyrite or pyrrhotite and occurs in both the chemically bonded state and as micro or nano size grains of metallic gold.

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Studies on the bioleaching of refractory concentrates

for the pre treatment of refractory gold ores and concentrates and the leaching of whole ore copper heaps In many cases it offers economic environmental and technical advantages over pressure oxidation and roasting1 2 However in order for bioleaching to compete successfully with other pre treatment processes it needs to be optimized

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Microbial oxidation of gold ores and gold bioleaching

01 06 1994  Bio oxidation of a refractory gold bearing high arsenic sulphide concentrate Biological pre oxidation to enhance gold and silver recovery from refractory pyritic ores and concentrates Bacterial oxidation technology a viable process for refractory gold ores and base metal recovery.

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The Leachox Refractory Gold Process The Testing Design

several refractory gold ores but on a relatively small scale In this paper the successful implementation of the process from initial testing through to commissioning at one of the world s largest refractory gold mines is described The Leachox plant has been designed to treat 50 tons per hour of a sulphide concentrate.

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Atmospheric alkaline pre oxidation of refractory sulphide

Atmospheric alkaline pre oxidation of refractory sulphide gold ores Creator Rego Alan Joseph Publisher University of British Columbia Date Issued 2018 Description Four iron sulphide containing gold ores from the White Mountain mine in the Jilin Province China were studied to examine the benefits of using oxidative treatment prior to

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Rebellious Ores Sulfides Selenides and Tellurides

Rebellious Ores Sulfides Selenides and Tellurides The early day miners feared it and it happened a lot more often than they would have liked the easily worked rich surface ores they discovered on the surface gave way as they mined downward to a vein full of sulfides base metals and other nasty rebellious and refractory ores.

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Mintek BacTech s bacterial oxidation technology for

sulphide ores The processes are aimed at both refractory gold bearing and base metal concentrates Previously BacTech had commercially implemented the refractory gold process at the Youanmi Gold Mine in Western Australia More recently the process has been incorporated in the Sulphide Treatment Plant at

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Processing of refractory gold sulphide carbonbearing ores

In connection with the depletion of mineral resources base of gold the engagement of refractory ores reserves in the processing becomes a necessary condition to stabilize gold market Standard methods of processing of refractory sulphide carbon bearing gold ores and float concentrates extracted from them include pressure oxidation and bacterial oxidation enabling

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TECHNICAL SESSION 2b Pre oxidation of refractory ores 1

11 09 2019  He came back to Academia in 2014 and his research interests are ore characterization hydrometallurgical processes of gold and copper rare earth elements biohydrometallurgy of refractory sulfide ores and novel sulfide oxidation processes recycling metals from urban resources mine water treatment repurposing mine tailing and biological

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Oxidation of a refractory gold concentrate using pressure

The gold group at SGS Minerals Metallurgy Malaga Western Australia has conducted a test programme in which a refractory gold ore sample was beneficiated by bench scale floatation to generate a bulk sulphide concentrate grading 10.6 g/t Au 13.1 S 11.4 Fe 0.18 C and 2.36 As Mineralogical analyses determined that gold in the ore was

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HYDROMETALLURGY OF GOLD NEW PERSPECTIVES AND

attention is given to the electrochemical treatment of refractory sulphide ores CYANIDATION The traditional hydrometallurgical process to recover gold from its ores and concentrates is cyanidation which consists in a cyanide leaching in basic media described by the following reaction 4Au 8CN– O 2 2H2O = 4AuCN2 4OH − 1

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Developments in the pretreatment of refractory gold

submicroscopic gold inclusions within sulphide minerals such as arsenopyrite and pyrite Such ores require a pre treatment process to alter or destroy the sulphide matrix and render the gold accessible to cyanide and oxygen Gudyanga et al 1999 The gold in high sulphur and high arsenic refractory gold concentrate HGC is encapsulated

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