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double refractory gold ores

2018-12-20T08:12:13+00:00

Double-Refractory Carbonaceous Sulfidic Gold Ores ...

Jan 01, 2016  Ores in which gold is associated with sulfides and with high carbonaceous matter content are considered double refractory. The northern Nevada region in the United States is a main area where this type of ore is found. Ores in the Carlin Trend District are characterized by the presence of submicroscopic gold (invisible gold) finely disseminated ...

Cited by: 5

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 and into solution.

SIMULTANEOUS BIOTRANSFORMATION OF CARBONACEOUS

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 ...

Cited by: 2

MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY GOLD

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

Microwave pretreatment of a double refractory gold ore ...

Sep 01, 2007  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 ...

Cited by: 116

Microbial pre-treatment of double refractory gold ores ...

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 ...

Estimated Reading Time: 9 mins

Refractory Gold Ore Treatment Methods

Jul 14, 2016  At the plant of the Consolidated Murchison Co. in the Transvaal, South Africa, where a refractory high-antimony gold ore is being treated, flotation and cyanidation of the flotation concentrates and tailings are being practiced. The association of the antimony and gold is very intimate, and during 1946, while the antimony recovery amounted to ...

Estimated Reading Time: 9 mins

Refractory gold ores: Challenges and opportunities for a ...

Mar 23, 2021  Gold miners are facing a reserves crisis, and what is left in the ground is becoming more and more challenging to process.Refractory gold reserves, which require more sophisticated treatment methods in order to achieve oxide-ore recovery rates, correspond to 24 percent of current gold reserves and 22 percent of gold resources worldwide (Exhibit 1).

Refractory Gold Technology

Refractory Gold Technology Sherritt’s Refractory Gold Technology is used to recover gold from refractory sulphide feedstocks. 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

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

Microbial pre-treatment of double refractory gold ores ...

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 ...

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

METHOD TO IMPROVE RECOVERY OF GOLD FROM DOUBLE REFRACTORY ...

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.

double refractory gold deposits

Jan 01, 2016 Figure 50.1 shows typical gold deportment of two double-refractory ores (a and b) compared with a nonrefractory oxide ore (c). The main gold carrier in the ore shown in Figure 50.1(a) is pyrite; the ore has a total sulfide content of 1.43% and a TCM content of 0.94%.

Establishing thE ProcEss MinEralogy of gold orEs

A notable example of such a double-refractory carbonaceous sulfide ore is at Barrick’s Goldstrike Mine where gold occurs in pyrite in refractory sulfide ore and double-refractory 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

Processing Refractory Gold - Hydrometallurgy: Leaching in ...

There are a number of factors that cause refractory behaviour in gold ores. Typically when we start investigating these ores the first step would be to undertake a mineralogical analysis that will tell you if your ore is sulphide refractory (and the grain size you are needing to target for liberation), if you have pregnant solution robbers or if you have a more complex telluride or double ...

Refractory Gold Technology

Refractory Gold Technology Sherritt’s Refractory Gold Technology is used to recover gold from refractory sulphide feedstocks. 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 ...

Gold Process Mineralogy - SGS

Goldstrike Mine, where gold occurs in pyrite in refractory sulfide ore and double-refractory sulfide/carbonaceous ore, gold ores are pretreated by autoclave and roaster prior to cyanide leaching.4.5 In the JInya Carlin-type gold deposit in China, gold occurs mainly as submicroscopic gold in arsenopyrite and pyrite and is recovered by roasting

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

Biotechnological Approaches to Facilitate Gold Recovery ...

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 Au(CN)2− with the carbonaceous matter. Combustion decreases the carbonaceous matter content, but also emits pollutant gases like ...

US20090158893A1 - Microbial pre-treatment 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 pre-treatment of double refractory gold ores - Google Patents Microbial pre-treatment of double refractory gold ores Download PDF Info Publication number ...

Gold mineral processing - Hatch Ltd

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.

Mycohydrometallurgy Review - Part 1: Preg-Robbing ...

Abstract . To contribute to research efforts in pretreatment processes, “mycohydrometallugy” was introduced into the literature of hydrometallurgy in 2010 by employing the fungus, Phanerochaete chrysosporium in a “one-pot” process, to pre-treat carbonaceous and sulphidic materials usually encountered in refractory gold ores, with the ultimate aim of enhancing gold extraction.

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

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

Sequential pretreatment of double refractory gold ore ...

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 (CFSM)from white-rot fungus Phanerochaete chrysosporium. The pretreatment by A. brierleyi significantly improved the gold recovery from 25% to 77%.

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.

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

double refractory gold deposits

Jan 01, 2016 Figure 50.1 shows typical gold deportment of two double-refractory ores (a and b) compared with a nonrefractory oxide ore (c). The main gold carrier in the ore shown in Figure 50.1(a) is pyrite; the ore has a total sulfide content of 1.43% and a TCM content of 0.94%.

Gold Two Stage Roasting - Outotec

Gold Two Stage Roasting. Get excellent metals recovery while removing impurities like arsenic with Outotec's gold roasting solutions. Our two-stage roasting plants are mainly used for treating double-refractory gold concentrates. A two-stage roasting process combines partial roasting in the first stage with dead roasting in the second stage.

New Developments in Ion Exchange Resins for the Recovery ...

The double-refractory nature of the Goldstrike ore has prompted Barrick Gold Company of Canada to develop a flowsheet using thiosulphate as an alternative lixiviant to cyanide. IX resin is the adsorbent of choice from thiosulfate leach liquors since activated carbon has no affinity for the gold

Gold Process Mineralogy - SGS

Goldstrike Mine, where gold occurs in pyrite in refractory sulfide ore and double-refractory sulfide/carbonaceous ore, gold ores are pretreated by autoclave and roaster prior to cyanide leaching.4.5 In the JInya Carlin-type gold deposit in China, gold occurs mainly as submicroscopic gold in arsenopyrite and pyrite and is recovered by roasting

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

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%.

10.1016/j.mineng.2004.05.009 DeepDyve

Jun 11, 2020  1 Introduction Refractoriness in gold ores may be caused by several factors including the presence of sulfides, tellurides, cyanicides and carbonaceous matter ( Boyle, 1979 ; Guay, 1981 ). When it is due to the presence of both sulfides and carbonaceous matter (CM), the ore is said to be double refractory ( Nyavor and Egiebor, 1992 ).

Gold processing 101 - Mining Magazine

Sep 07, 2017  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.

Leachox™ Refractory and Sulphide Gold Process Maelgwyn ...

Refractory gold ores are generally defined as those ores that do not give economical recoveries in conventional cyanide circuits where the ore has been ground to around 53 to 75 microns. The gold is normally present in refractory gold sulphide ores containing mainly pyrite, arsenopyrite or pyrrhotite and occurs in both the chemically bonded ...