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double refractory gold ores

Biological pretreatment of carbonaceous matter in double ...

The pretreatment of carbonaceous material in double refractory gold ores (DRGO) is necessary to decrease preg-robbing of gold and maximize gold recovery. DRGO contains of carbonaceous matter and gold grains encapsulated in sulfide minerals, which typically results in very poor gold recovery.

(PDF) Cyanidation of Refractory Gold Ores: A Review

double refractory gold or es", Minerals . Engineering, Vol. 18, ... Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide leaching circuits, even when the ...

Refractory ore | chemistry | Britannica

Other articles where Refractory ore is discussed: gold processing: Extraction from refractory ores: Many gold-bearing ores and concentrates are not readily amenable to cyanidation, owing to the presence of substances that consume the cyanide reagent before it can dissolve the gold, preferentially adsorb the gold as it dissolves (a phenomenon called preg-robbing), or completely surround the…

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 …

Double-Refractory Carbonaceous Sulfidic Gold Ores ...

Jan 01, 2016· 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) finely disseminated within a …

NOVEL GOLD DEPORTMENT TECHNIQUE - APPLICATIONS …

A novel gold deportment technique has been developed for complex copper-gold and double refractory gold ores using state-of-the-art technology. Characterization of these ores is a challenging task due to low copper and gold grades in ores, presence of both primary and secondary copper sulfide phases

A two-stage bacterial pretreatment process for double ...

A two-stage bacterial pretreatment process for double refractory gold ores R.K. Amankwah a,*, W.-T. Yen a, J.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 concentrates were ...

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 …

Double-Refractory Carbonaceous Sulfidic Gold Ores ...

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 ...

Enhancing Gold Recovery from Nevada Double Refractory …

Enhancing Gold Recovery from Nevada Double Refractory Gold Ores using a Novel Dual Bubble Generator by Jian Huang A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Chemical Engineering ... gold ores) . A A A A = −))))) 55) ...

Technology to enhance gold recovery for double refractory ...

A new technology to improve gold recovery in the processing of double refractory ores, which often resulted in native carbon competing with activated carbon and limiting gold recovery – commonly ...

Transformation of the carbonaceous matter in double ...

Sulfides and carbonaceous matter in double refractory gold ore (DRGO) were bio-treated sequentially using an iron-oxidizing archaeon Acidianus brierleyi followed by lignin peroxidase-dominating crude enzymes released from the white-rot fungus Phanerochaete chrysosporium to significantly improve gold recovery from 24% to 92%.

v117n8a4 Evaluation of ozonation technology for gold ...

of refractory and double refractory gold ores. Commonly, in these types of ores, the gold is associated with sulphide minerals. The presence of sulphides can affect gold recovery via cyanidation due to encapsulation or passivation of the gold, thereby increasing reagent consumption. In the case of double refractory ores, gold recovery is ...

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) finely disseminated within a sulfiderich matrix within carbonaceous material.

Technology options for processing complex and double ...

The initial results for the cyanide leach gold recoveries were very poor on a high-grade primary sulphide ore of 6.2 g/t Au with no silver. Subsequent mineralogy showed the ore to be a characteristic pyrite, carbonaceous refractory gold ore (double refractory). This was a very disappointing finding. A small scale gravity and flotation test programme...

Gold extraction - Wikipedia

A "refractory" gold ore is an ore that has ultra fine gold particles disseminated throughout its gold occluded minerals. These ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes. These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold.

GOLD IN ZIMBABWE - SAIMM

and pyrite-solid solution gold atomically distributed in the crystal structure sulphide minerals •Naturally occurring active carbon which results in preg-robbing . 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

ALTA Gold 2012 E-Doc - Albion Process

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 physically 'locked' in sulphide minerals. ...

MICROBIAL PRE-TREATMENT 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 pre-treatment of double refractory gold ore (sample A) and

Gold processing 101 - Mining Magazine

In the case of Goldstrike, this was a double-refractory ore combining sulphide-occluded gold with preg-robbing carbonaceous material that rendered the ore unsuitable for conventional cyanide leaching and carbon adsorption.

REFRACTORY GOLD - PanTerra Gold Limited

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

ALTA MetBytes - What's Happening in Gold Ore Processing

double refractory ore has been achieved at Nordgold's Suzdal mine in Kazakhstan which treats double refractory ore with both visible and invisible gold hosted in sulphide associations of pyrite and arsenopyrite and also, carbonaceous black shale. Following extensive laboratory and demonstration scale testing of the Outotec

refractory gold ore - rndi.it

Double-Refractory Carbonaceous Sulfidic Gold Ores. 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) finely disseminated within a sulfide-rich matrix within carbonaceous material.

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 ...

Extraction of Gold from a Low-Grade Double Refractory Gold ...

R. Badri and P. Zamankhan, "Sulphidic refractory gold ore pre-treatment by selective and bulk flotation methods," Advanced Powder Technology, 24 (2) (2013), 512–519. CrossRef Google Scholar

WO2009037596A2 - Method to improve recovery of gold from ...

Removal of TCM from unoxidized, double refractory ores has been problematic due to significant gold losses in the TCM concentrate, which renders such removal impractical. Removing TCM from oxidized sulfide products can circumvent such gold losses and reduce the preg robbing behavior of the ores.

US8262768B2 - Method to improve recovery of gold from ...

Method to improve recovery of gold from double refractory gold ores Download PDF Info Publication number US8262768B2. US8262768B2 US12/208,985 US20898508A US8262768B2 US 8262768 B2 US8262768 B2 US 8262768B2 US 20898508 A US20898508 A US 20898508A US 8262768 B2 US8262768 B2 US 8262768B2 Authority US United States Prior art keywords