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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 ...
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
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.
The initial results for the cyanide leach gold recoveries were very poor on a high-grade primary sulphide ore of 6.2 gt 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...
The present application claims the benefits of U.S. Provisional Application Ser. Nos. 60990,805, filed Nov. 28, 2007, and 61088,928, filed Aug. 14, 2008, both entitled Microbial Pre-Treatment of Double Refractory Gold Ores, both of which are incorporated herein by this reference in their entireties.
Method to improve recovery of gold from double refractory gold ores Download PDF Info Publication number US8262768B2. US8262768B2 US12208,985 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 fraction
Sep 11, 2008 Ores having both problems are known as double refractory ores. A common method of treating refractory gold ores to render the gold recoverable by cyanidation is by pressure oxidation in autoclaves. Pressure oxidation oxidizes sulfide minerals, rendering the residue non-refractory.
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 ...
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 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. ...
Ausenco provided a scoping study, followed by a feasibility study for the Project, with the objective of improving the gold recovery process for double refractory ores processed in the Autoclave Facility Subsequently, in 2011, Barrick retained.
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 during ...
Refractory gold ores have increasingly been the main source of gold production with the exhaustion of amenable gold ores. Of the 2630 tons of total world gold production in 2011, about 25 was produced from refractory gold deposits, and of the top 20 gold operations in 2011, eight were processing refractory ores .Commonly, relatively high ...
Double refractory gold ore DRGO not only include ppt levels of gold grains locked in sulfide minerals but also a problematic amount of carbonaceous matter. This causes a significant recovery loss of gold during cyanidation because of the strong affinity of the AuCN2 with the carbonaceous matter. Combustion decreases the carbonaceous matter content, but also emits pollutant gases like ...
refractory gold ore by V. Bazhko and V. Yahorava 47060 The depletion of conventional gold resources around the world has resulted in mining companies and research institutions exploring the recovery of gold from refractory and double refractory ores. However, conventional gold processing routes are not feasible for such deposits due. Contact Seller
Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cell-free spent medium CFSMfrom white-rot fungus Phanerochaete chrysosporium. The pretreatment by A. brierleyi significantly improved the gold recovery from 25 to 77.
The treatment process of a low-grade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work. The gold extraction of this ore by all-sliming cyanidation was only 11.75. Hence, a pretreatment was necessary. In this paper, a flotation-preoxidation-cyanide leaching process was developed. The concentrate from the flotation procedure was processed using ...
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, Queens University, Kingston, Ontario, Canada K7L 3N6 b Chemical Engineering Department, Queens University, Kingston, Ontario, Canada K7L 3N6 Received 7 April 2004 accepted 11 May 2004 Abstract Double refractory gold
N2 - Natural carbonaceous matter aided the bioleaching of Cu from chalcopyrite concentrates. The oxidative dissolution of chalcopyrite was enhanced more significantly by anthracite than carbonaceous matter in double refractory gold ore DRGO. This was achieved through Galvanic interactions between the chalcopyrite and natural carbonaceous matter.
Refractory ore chemistry Britannica. 2020-11-19 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 ...
carbonaceous refractory gold ore double refractory. This was a very disappointing finding but useful in that large amounts of money were not spent drilling a problematic gold ore. A small scale gravity and flotation test programme was developed to produce a concentrate with the majority of the gold.
The roaster facility at Barrick Goldstrike Mine treats double-refractory sulfidiccarbonaceous gold ore. Prior to oxidation in the roasters, the ore is ground in two parallel dry grinding circuits utilizing 19 x 75 double rotator mills. The design plant throughput was 12,000 dstpd.
The presence of carbon in the ore can result in the orebody being classified as double refractory and this may require additional process steps again. To clarify refractory gold ores are generally defined as those ores that do not give economic recoveries in conventional cyanide circuits where the ore has been ground to around 53-75 microns.
double refractory ore has been achieved at Nordgolds 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
The key to double refractory ore. Double refractory ore concentrate contain ore micron gold particles encapsulated in sulfides pyrites and arsenic pyrites together with high concentrations of organic carbon, that is why conventional methods such as cyanidation or heap leach gives very low recoveries.
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.
Dec 23, 2018 But the ore is double refractory, meaning the gold is locked within the pyrite and contains a lot of carbon. Breaking the gold free requires both physical ultra-fine
Study on the Gold Recovery of Double Refractory Gold Ore Concentrate by Biological Oxidation Pretreatment. Article Preview. Abstract In this paper, Bacterial oxidation-cyanide leaching experiments were carried out and the carbonaceous substances composition of carbonaceous gold concentrate was been studied. The elemental composition was 9.73 ...
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.
Gold deportment studies for these ores are different and easier than complex copper-gold and double refractory gold ores. The gold ore body in this investigation is in north-eastern Nevada, United States and is commonly known as a Carlin type deposit, after the Carlin ore body. Mineralization covers an extensive area and
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