double refractory gold deposits

Refractory Gold | Mining | SGS

Mining Refractory Gold. SGS has earned the reputation as the world's leading gold metallurgical testing facility. Our decades of experience have allowed us to assemble the most comprehensive assortment of expertise and equipment to address refractory gold issues.

The reasons of gold refractory, Gold ore classification ...

Nov 28, 2016· The reason of the gold mineral refractory There are so many types of reasons that caused the difficulty of gold ore processing, including physical element, chemical element, and mineralogical element.

Tech to enhance gold recovery for double refractory ore ...

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 ...

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

Jan 01, 2005· Read "A two-stage bacterial pretreatment process for double refractory gold ores, Minerals Engineering" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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 ... 2.3 Global Refractory Gold Ores Deposits ...

refractory gold Archives - International Mining

"Pressure oxidation was selected as the most feasible processing technology for double refractory ores. It is able to achieve gold recoveries of 96% by utilising high temperatures, elevated pressure and oxygen to recover encapsulated gold, while conventional cyanidation methods would result in sub-optimal recovery rates of 20-40%.

Gold extraction - Wikipedia

Gold extraction refers to the processes required to extract gold from its ores.This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore.. Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing, resulting in direct recovery of ...

Applied Mineralogy of the Suurikuusikko Refractory Gold ...

Applied Mineralogy of the Suurikuusikko Refractory Gold Deposit, Northern Finland K Kojonen1, L J Cabri2, G McMahon3, B Johanson4, J Leppinen5 and R Kalapudas6 ABSTRACT The Suurikuusikko gold ...

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...

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.

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

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 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 …

Biooxidation of a double-refractory gold-bearing sulfide ...

Sep 22, 2015· The efficiency of biooxidation for treatment of a double-refractory gold-bearing sulfide ore concentrate from the Bakyrchik deposit (East Kazakhstan) was defined. The experiments were conducted in two different modes, i.e., with the standard liquid medium and the medium imitating the chemical composition of the Bakyrchik deposit groundwater and containing high concentrations of …

Gold ore processing : project development and operations ...

Outlining best practices in gold processing from a variety of perspectives, Gold Ore Processing: Project Development and Operations is a must-have reference for anyone working in the gold industry, including metallurgists, geologists, chemists, mining engineers, and many others.

Establishing thE ProcEss MinEralogy of gold orEs

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 Carlin-type gold deposit in China, gold occurs mainly as submicroscopic gold in

Processing Refractory Gold - Hydrometallurgy: Leaching in ...

May be increasing gold recovery from refractory gold ore (with grade 2-3 g/t) to 90-95%?Actual data of top refractory gold ore mines show, that gold recovery is 70% and less. What is reason? It is a problem in minerals processing or it is a global science problem? So if you work with refractory ore,

Study on the Gold Recovery of Double Refractory Gold Ore ...

Study on the Gold Recovery of Double Refractory Gold Ore Concentrate by Biological Oxidation Pretreatment p.379. Spectroscopic and Microscopic Investigation for Biohydrometallurgy ... Home Advanced Materials Research Biotechnologies in Mining Industry and... Study on the Gold Recovery of Double Refractory...

ALTA MetBytes - What's Happening in Gold Ore Processing

implemented by Barrick to treat double refractory gold ore following pressure oxidation at its Goldstrike Mine in Nevada, USA. The CSIRO reagent system is an alternative to cyanide and has particular application where cyanide cannot be used and to unlock stranded high-grade deposits.

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