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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
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 .
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.
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 .
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 .
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.
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 .
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 "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.
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 .
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...
Chapter 45. Processing of High-Silver Gold Ores; Chapter 46. Recovery of Gold as By-Product from the Base-Metals Industries; Chapter 47. Extraction of Gold from Platinum Group Metal Ores; Refractory Ores; Chapter 48. Refractory Sulfide Ores-Case Studies; Chapter 49. Preg-Robbing Gold Ores; Chapter 50. Double-Refractory .
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.
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 .
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
Double refractory gold ores (DRGO) contain metal sulfides that encapsulate gold and prevent its dissolution by cyanide, and carbonaceous matter (CM) that adsorbs gold cyanide complex. Pretreatment is therefore required to decompose the sulfides and liberate gold before cyanidation, and to deactivate CM and prevent it from adsorbing gold .
Chapter 45. Processing of High-Silver Gold Ores; Chapter 46. Recovery of Gold as By-Product from the Base-Metals Industries; Chapter 47. Extraction of Gold from Platinum Group Metal Ores; Refractory Ores; Chapter 48. Refractory Sulfide Ores-Case Studies; Chapter 49. Preg-Robbing Gold Ores; Chapter 50. Double-Refractory Carbonaceous Sulfidic ...
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 preg-robbing due to the presence of organic carbon. These must be pretreated ahead of leaching.
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 ...
A double refractory gold ore usually contains both sulfide minerals and carbonaceous matter and results in very low gold extraction. The micro-sized gold particles are enclosed inside the mineral ...
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
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.
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. ...
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 .
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