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double refractory gold ores

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Gold mineral processing

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 pregrobbing due to the presence of organic carbon. These must be pretreated ahead of leaching.

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GOLD IN ZIMBABWE SAIMM

and pyritesolid solution gold atomically distributed in the crystal structure sulphide minerals •Naturally occurring active carbon which results in pregrobbing . Gold may be exposed to cyanide solution for leaching but recovery is inhibited by the gold getting adsorbed onto carbon •Double refractory are concentrates or ores in which gold is

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Establishing thE ProcEss MinEralogy of gold orEs

A notable example of such a doublerefractory carbonaceous sulfide ore is at Barrick’s Goldstrike Mine where gold occurs in pyrite in refractory sulfide ore and doublerefractory sulfidic/ carbonaceous ore. These ores are pretreated by autoclave and roaster prior to cyanide leaching (Thomas et al., 2000; Wickens et al., 2003). In the Jinya

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Microwave pretreatment of a double refractory gold ore ...

Abstract Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an ...

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Gold ore processing : project development and operations ...

Chapter 45. Processing of HighSilver Gold Ores; Chapter 46. Recovery of Gold as ByProduct from the BaseMetals Industries; Chapter 47. Extraction of Gold from Platinum Group Metal Ores; Refractory Ores; Chapter 48. Refractory Sulfide OresCase Studies; Chapter 49. PregRobbing Gold Ores; Chapter 50. DoubleRefractory Carbonaceous Sulfidic ...

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Microwave pretreatment of a double refractory gold ore ...

Double refractory gold ores, such as Barrick’s Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon.

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US20090158893A1 Microbial pretreatment of double ...

The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media. US20090158893A1 Microbial pretreatment of double refractory gold ores Google Patents Microbial pretreatment of double refractory gold ores Download PDF Info Publication number ...

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Refractory Gold Ore Treatment Methods

Metallurgical ContentGold Leaching Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, and …

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Transformation of the carbonaceous matter in double ...

Sulfides and carbonaceous matter in double refractory gold ore (DRGO) were biotreated sequentially using an ironoxidizing archaeon Acidianus brierleyi followed by lignin peroxidasedominating crude enzymes released from the whiterot fungus Phanerochaete chrysosporium to significantly improve gold …

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NOVEL GOLD DEPORTMENT TECHNIQUE APPLICATIONS …

A novel gold deportment technique has been developed for complex coppergold and double refractory gold ores using stateoftheart technology. Characterization of these ores is a challenging task due to low copper and gold grades in ores…

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gold ores double COMO NOOSA

Ores where gold is associated with sulfides and with high carbonaceous matter content are considered double refractory. Ores in the Carlin Trend District are characterized by the presence of submicroscopic gold (invisible gold…

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Barrick Thiosulfate Leaching of Double Refractory Ore

Double refractory ores present a unique challenge to the traditional method of gold recovery in mining. Double refractory ores are ores that contain sulfides and carbons, as opposed to single refractory ores which contain only sulfides. In general, the cyanide solution pulls the gold out of the ore …

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Gold processing 101 Mining Magazine

In the case of Goldstrike, this was a doublerefractory ore combining sulphideoccluded gold with pregrobbing carbonaceous material that rendered the ore unsuitable for conventional cyanide leaching …

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ALTA Gold 2012 EDoc Albion Process

Refractory gold ores are those that do not yield high gold recoveries in conventional cyanideleaching 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 physically ‘locked’ in sulphide minerals. ...

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A twostage bacterial pretreatment process for double ...

A twostage bacterial pretreatment process for double refractory gold ores Amankwah a,*, W.T. Yen a, Ramsay b a Mining Engineering Department, Queen’s University, Kingston, Ontario, Canada K7L 3N6 b Chemical Engineering Department, Queen’s University, Kingston, Ontario, Canada K7L 3N6 Received 7 April 2004; accepted 11 May 2004 Abstract Double refractory gold …

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Gold ore processing : project development and operations ...

Chapter 45. Processing of HighSilver Gold Ores; Chapter 46. Recovery of Gold as ByProduct from the BaseMetals Industries; Chapter 47. Extraction of Gold from Platinum Group Metal Ores; Refractory Ores; Chapter 48. Refractory Sulfide OresCase Studies; Chapter 49. PregRobbing Gold Ores; Chapter 50. DoubleRefractory …

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MICROBIAL PRETREATMENT OF DOUBLE REFRACTORY …

of double refractory gold ores and concentrates. Currently numerous studies are in progress to further improve upon the efficiency of the bacterial process and to investigate the potential of other microorganisms. In this study, microbial pretreatment of double refractory gold ore (sample A) and

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REFRACTORY GOLD PanTerra Gold Limited

Highly refractory gold mineralisation – including double refractory ores, gold associated with both sulphide and carbonaceous mineralogy. Low to middletier resources that target a gold production of less than 150,000 oz per annum.

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US20090158893A1 Microbial pretreatment of double ...

The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media. US20090158893A1 Microbial pretreatment of double refractory gold ores Google Patents Microbial pretreatment of double refractory gold ores …

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