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flotation of gold ores in pyrite and arsenopyrite

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    carbonate minerals fig 12–1 table 12–1 Gold mineraliza tion resulting from dissolution of Au bearing arsenopyrite and pyrite grains can also be included in the supergene paragenesis fig 12–1 Coincident with mineral changes in the supergene enrichment zone primary carbonate minerals are

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  • The Leachox Refractory Gold Process The Testing Design

    The Leachox refractory gold process has to date been applied to the selectivetreatment of 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

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  • The arsenopyrite is oxidized at a greater rate than pyrite because it has a lower electrode potential 36 so that the gold is released faster if it is as sociated to arsenopyrite Moreover galvanic contact of pyrite arsenopyrite leads to a preferential oxidation of the latter acting as the anode and passi vation of pyrite the more noble acting as the cathode.

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  • Thermoacidophilic micirobial community oxidizing the gold

    An aboriginal community of thermophilic acidophilic chemolithotrophic microorganisms ACM was isolated from a sample of pyrite gold bearing flotation concentrateat 45 47 degrees C and pH 1.8 2.0 Compared to an experimental thermoacidophilic microbial consortium formed in the course of cultivation

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  • Bacterial Oxidation of Refractory Sulfide Ores for Gold

    27 09 2008  Abstract The microbiological leaching of refractory sulfide ores pyrite arsenopyrite for recovery of gold is reviewed in this article The underlying physiological biochemical and genetic fundamentals of the bacteria involved Thiobacillus and Sulfolobus spp are complex and have yet to be elucidated in depth.The chemistry of acid and biological leaching of pyrite and arsenopyrite

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  • Ask The Experts

    A It s true that pyrite from gold mines will contain a small amount of gold It is microscopic and is found inside the pyrite crystal Miners who process gold ores will get free gold particles that can be melted into bars but they also recover pyrite that has small amounts of gold within it Often the majority of the gold is in the free

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  • Gold Process Mineralogy

    gold ores are often somewhat refractory due to the presence of slow dissolving gold minerals such as aurostibite AuSb 2 maldonite Au 2 Bi and gold tellurides Carbonaceous sulfide ores are the typical refractory ores because the gold is fine grained and usually is predominantly associated with the sulfide minerals pyrite and arsenopyrite

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  • pyrite gold ore mobile

    Pyrite if present in an arsenical gold ore may contain some gold as minute inclusions Flotation of arsenical gold ores associated with base metals is accomplished using a sequential flotation technique with flotation of base metals followed by flotation of goldcontaining pyrite/arsenopyrite The pyrite/arsenopyrite is floated at a weakly acid pH with a xanthate collector

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  • Alkaline Oxidative Leaching of Gold Bearing Arsenopyrite Ores

    increase the recovery of gold from arsenopyrite FeAsS ores The best solution compositions for arsenopyrite dissolution were determined using cyclic voltammetry and chronocoulometry Initial arsenopyrite dissolution occurred at 0.20 V versus standard hydrogen electrode SHE in a sodium hydroxide Na0H solution.

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  • Gold Recovery 101 From Sepro s Gold Recovery Experts

    Gold often occurs in close association with sulfide minerals such as arsenopyrite pyrite and chalcopyrite Sulfide associated gold is often very fine in nature and difficult to separate from the sulfides Refractory Gold A refractory gold ore can be defined as any ore that responds poorly to a conventional gravitycyanidation process with

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  • Studies on the bioleaching of refractory concentrates

    arsenopyrite/pyrite flotation concentrate11 and the identification of L ferrooxidans and Thiobacillus caldus in continuous flow bioleaching oxidation tanks used to treat a variety of metal containing ores and concentrates12 According to the multiple sub process mechanism the sulphide mineral is chemically oxidized by ferric iron 1 2

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  • Revealing the Chemical Form of ``Invisible Gold in

    The pyrite is from a refractory gold ore collected on a sandy mine tailing in Colombia South America The ore is composed dominantly of pyrite 90 and minor quartz and has no arsenopyrite The arsenopyrite comes from the Villeranges deposit located along the Marche Combrailles shear zones in the northwest of the French Massif Central.

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  • flowsheet on processing of pyrite gold ores

    Many gold ores and concentrates contain fine grained gold locked within sulphide minerals such as pyrite and/or arsenopyrite unavailable for recovery by conventional leaching In Sherritt s gold process the sulphide and arsenide minerals are completely oxidized by pressure oxidation thereby liberating the gold.

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  • Flotation enrichment of resistant gold ores

    Native gold is distributed very unevenly forms the finest precipitates ranging in size from tenths of a micron to 0.063 mm grows together with quartz arsenopyrite pyrite and bismuth minerals Rich ores were formed by combining bismuthcontaining associations with arsenopyrite The role of gold in arsenopyrite increases with depth.

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  • gold flotation help mining

    6 years ago Lime and soda ash will depress the flotation of sulphides Beyond that I cannot remember anything of flotation as I primarily work in leach/CIL sorry 2 level 2 bongmasterr Original Poster 6 years ago Ive already talked about lime as a depressant and ph controller but thank you anyway.

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  • Recovery Refractory Resources

    Refractory gold ore needs pre treatment for cyanidation to be effective in gold recovery Pyrite and arsenopyrite are the most common host minerals in refractory gold deposits flotation concentrate oxidising 98 of the

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  • Separating Flotation Gold From Pyrite

    Separating Arsenopyrite From Pyrite Laboratory Testing The slurry is heated at around 65 oC one more time it is important to perform tests e.g 40 to 70oC to evaluate the effect of the temperature on the flotation selectivity between pyrite and arsenopyrite.

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  • Oxidation state of gold and arsenic in gold bearing

    XANES measurements on gold bearing arsenian pyrite from the Twin Creeks Carlin type gold deposits show that gold is present as both Au 0 and Au I and arsenic is present at As I– Au 0 is attributed to sub micrometer size inclusions of free gold whereas Au I is attributed to gold in the lattice of the arsenian pyrite.

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  • Minerals of Which To Beware Arsenopyrite

    01 10 2020  Arsenopyrite is related to pyrite and marcasite However its silver color easily distinguishes it from its golden yellow cousins This mineral is opaque with a metallic luster and it leaves a streak ranging from gray to black on a ceramic streak plate.

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  • Development of Processing Alternatives for Frankfield East

    01 01 2012  Selective flotation was investigated to recover a gold arsenopyrite concentrate thereby reducing the mass which would be subjected to further gold processing As part of this work a pyrite concentrate low in arsenic content was also recovered that would be suitable as a source of sulphur for a smelter or other pyrometallurgical facility .

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  • Flotation data for the design of process plants Part 2

    sequential flotation circuit versus Cadia s simple copper gold flotation circuit The common theme is that pyrite forms the principal floatable concentrate diluent Hellyer ore contains finely disseminated chalcopyrite sphalerite galena and tetrahedrite The flotation plant design was

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  • Thermoacidophilic micirobial community oxidizing the gold

    1 Mikrobiologiia 2014 Sep Oct83 5 552 64 Thermoacidophilic micirobial community oxidizing the gold bearing flotation concentrate of a pyrite arsenopyrite ore .

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  • Bimodal Distribution of Gold in Pyrite and Arsenopyrite

    ARC Centre of Excellence in Ore Deposits School of Earth Sciences University of Tasmania Hobart Tasmania 7001 Australia Abstract This study investigates the microstructures geochemistry and hydrothermal evolution of gold bearing pyrite and arsenopyrite from six orogenic gold deposits in the Archean Eastern Goldfields Province Western Aus

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  • SIMULTANEOUS BIOTRANSFORMATION OF CARBONACEOUS

    pyrite and arsenopyrite and sulfide containing gold concentrate biotransformation led to high concentrations of iron sulfur and arsenic in incubation solutions and reduction in sulfide sulfur in the residual solids Overall decomposition of sulfide sulfur in the samples was 15 wt 35 wt and 57

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  • g Au in arsenopyrite or pyrite These refractory gold ores

    Invisible gold in sulphides The main cause of many refractory gold ores is invisible gold sub microscopic gold in sulphides Gold in solid solution in arsenopyrite and pyrite mainly Up to several hundred ppm Mechanism of solid solution is not well understood because Au is a much larger ion than Fe As or S

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  • PRESSURE OXIDATION OF PYRITE ARSENOPYRITE REFRACTORY GOLD

    Keywords gold ore hydrometallurgy leaching factorial design Introduction Many of the gold deposits today contain gold finely disseminated in iron sulfide min erals such as pyrite and arsenopyrite Such deposits are known as refractory gold ores due to encapsulation of fine gold particles in the host mineral Iglesias and Carranza

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  • Gold in Arsenopyrite

    02 04 2009  I have some gold ore that I can get a LOT more of that is roomered to contain 16 oz of gold per ton Im getting an assay but until then I would like to know a good way recoverying the gold out of the ore if it proves to be worth while based on the assay It is arsenopyrite It contains arsenic Iron Gold and cobalt to my understanding.

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  • Bimodal Distribution of Gold in Pyrite and Arsenopyrite

    These observations suggest that visible gold formation is associated with hydrothermal alteration of preexisting pyrite and arsenopyrite Textural observations and LA ICP MS data suggest that some invisible gold was remobilized from early formed pyrite and arsenopyrite to form visible gold during development of these alteration rims.

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  • A new kind of invisible gold in pyrite hosted in

    Ores with invisible gold are characterized by trace amounts of gold hosted in sulfide minerals from a few parts per million to several thousand parts per million predominantly pyrite and arsenopyrite Cook and Chryssoulis 1990 and this is now a common resource for the gold mining industry.

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  • Separation of Pyrite and Arsenopyrite in a Gold Sulfide

    Gold at the Harbour Lights Mine HLM WA occurs principally in pyrite Py and arsenopyrite AsPy minerals rendering it inaccessible to direct cyanidation Froth flotation produces a concentrate with low mass recovery and with high recoveries of sulfides After investigating several alternatives a novel flotation process has been developed to separate the concentrate into pyrite and

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  • Microbial oxidation of gold ores and gold bioleaching

    01 06 1994  This paper reviews recent progress in the use of microorganisms tooxidize the sulfidic matrix in refractory gold ores bio oxidation and to solubilize elemental gold bioleaching Arsenopyrite oxidation Bioleaching Biohydrometallurgy Pyrite oxidation Refractory gold ores Thiobacillus ferrooxidans

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  • Gold Balance Submicroscopic Gold Quantification

    Understanding the deportment of gold locked in pyrite arsenopyrite or other minerals in either gold ores or mill products is critical to troubleshooting low gold recovery Submicroscopic gold is a major form of gold in many refractory ores particularly Carlin type ores and some epithermal gold ores SGS Minerals Services can quantify

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  • Biological Leaching Pressure Oxidation for Auriferous

    flotation tailings stockpile and in situ ore reserves Run of mine ore was proposed to be milled and floated in a two stage flotation circuit to produce lead and zinc concentrates followed by flotation of the remaining sulphides in the zinc tailings to produce a gold containing arsenopyrite/ pyrite concentrate.

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  • Pyrite

    Arsenopyrite is usually a pale metallic whitish yellow Care should be taken if roasting sulfide ores as arsenopyrite may be present The fumes are obviously quite toxic All three pyrites may be present in a gold ore in varying amounts None are magnetic Personally I avoid trying to process gold ore with even moderate amounts of metallic

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  • Gold and arsenic in pyrite Geology and gold on Otago s

    24 10 2021  The main arsenic mineral is arsenopyrite FeAsS and this mineral is contain small but detectable amounts of gold around 1 10 part per million that is similar to gold contents in pyrite at Macraes gold Petrie B.S Craw D Ryan C.G 2005 Geological controls on refractory ore in an orogenic gold deposit

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  • Corrosion Behavior of a Pyrite and Arsenopyrite Galvanic

    The chemical formulas of pyrite and arsenopyrite are FeS 2 and FeAsS respectively Pyrite and arsenopyrite are the two most important gold containing minerals in gold ores 1 2 3 4 .Fine grained or submicroscopic gold is disseminated within pyrite and arsenopyrite thereby rendering gold inaccessible to cyanide solutions .Dissolving pyrite and arsenopyrite is the main objective of the

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  • Treatment for gold ores with high content of carbonaceous

    minerals pyrite arsenopyrite stibnite etc and insoluble siliceous gangue by association with tellurides clays and How to cite Valdivieso Bermeo P Peñaloza I and Moreno Chávez J Treatment for gold ores with high content of carbonaceous matter.

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  • The arsenopyrite is oxidized at a greater rate than pyrite because it has a lower electrode potential 36 so that the gold is released faster if it is as sociated to arsenopyrite Moreover galvanic contact of pyrite arsenopyrite leads to a preferential oxidation of the latter acting as the anode and passi vation of pyrite the more noble acting as the cathode.

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  • Selective Flotation of Pyrite from Arsenopyrite by Low

    In this study the surface modification of arsenopyrite and pyrite with low temperature oxygen plasma was developed as an effective approach to improve the flotation separation efficiency of minerals The micro flotation experiments results indicated that plasma pre treatment can achieve selective flotation of arsenopyrite from pyrite

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