ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

2 INTRODUCTION Refractory gold ores present a number of problems to the gold producer. Much has been written about the suitability of particular pretreatment processes for specific

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Alkaline leaching pretreatment and cyanidation of ...

The comprehensive recovery of small amounts of valuable minerals such as gold and base-metal sulfide minerals from a low-grade refractory ore was investigated.

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gold ore pretreatment - internation-hockey.be

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES Refractory gold ores present a number of problems to the gold producer. Much has been written about the suitability of particular pretreatment processes for specific gold ores.

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pretreatment of refractory gold ore with microwaves

Refractory Ore Gold And Pretreatment . pretreatment of refractory ores prior to gold leaching. pretreatment of refractory ores prior to gold and effects of the microwave pretreatment on cyanide leaching are investigated The Read more .

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Application Note Refractory Gold Pretreatment - pH

Application Note Refractory Gold Pretreatment - pH Mining: Gold Processing Refractory gold ores are defi ned as containing minerals or carbon compounds that trap encapsulated gold and make

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MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY GOLD ORES

In this study, microbial pre-treatment of double refractory gold ore (sample A) and concentrate (sample B) was investigated using a white-rot fungus,

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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.

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pretreatment of refractory ores prior to gold leaching ...

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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 ...

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Recovery Refractory Resources - sgs.com

September 2012 www. .com 148 PRECIOUS METALS PROCESSING Recovering refractory resources Refractory gold ore needs pre-treatment for cyanidation to be effective in gold

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Supercritical Water Treatment of Refractory Gold Ores

With pretreatment, gold recovery was 90%; by contrast, gold recovery was below 10% without pretreatment. Recent work at the Bureau of Mines showed some unique and potentially useful results when refractory gold ores were pretreated with supercritical water before standard leaching. This work is described below. Because the work was exploratory, this paper is a status report; much more …

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ALTA Gold 2012 E-Doc - albionprocess.com

estimates for different methods of pretreatment were prepared and these estimated costs and ore sulfide grades then used to compare the process economics. 250 INTRODUCTION A significant contemporary challenge for gold mining companies is to define economic process options for treating more complex orebodies as the less refractory ores become depleted. Demonstration of economic …

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Pretreatment of a refractory arsenopyritic gold ore using ...

An arsenopyrite refractory ore was pretreated with NaOH to increase gold extraction. • After pretreatment, gold and silver were leached with copper ammonium thiosulfate solution.

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refractory ore gold and pretreatment - residence-archambeau.be

álogo de fabricantes de Filtro De Cerámica Porosa de alta . Espuma porosa filtros cerámicos para fundición de metal. US $1-100 / Unidad. 1 Unidad/es (Pedido mínimo). 4 YRS Honesty Refractory

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Effect of Pretreatment of Sulfide Refractory Concentrate ...

Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host. A clear boundary between refractory and non-refractory ore in terms of gold recovery is not well defined, but several authors have pointed out that less than 60% gold recovery by direct cyanide leaching, after fine grinding of mineral indicates a refractory mineral [1]. The refrac ...

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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.

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Treatment of Refractory Gold Ores - XPS

for the detailed metallurgical testwork required for successful refractory gold processing. While the recovery of free milling gold by gravity and direct cyanidation is straightforward and well- established, refractory ores pose a very different challenge to producers.

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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 …

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Gold extraction - QueensMineDesignWiki

Finally, refractory ores require additional chemical reagents or pre-treatment processes to attain sufficient gold recovery. This portion of the article will focus on the origins, characteristics, and required processing techniques for free-milling, complex and refractory ores.

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Developments in the pretreatment of refractory gold ...

processing refractory gold ores, especially development in the pretreatment of refractory gold minerals by nitric acid. These processes include the high-pressure and the atmospheric-pressure oxidation methods. High-pressure oxidation processes are difficult to carry out, because they require high-capital cost autoclaves. Atmospheric-pressure oxidation processes are easier to manipulate, but ...

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Gold mineral processing - Hatch Ltd

Refractory gold ore pretreatment Treatment of refractory gold ore (whole ore and flotation concentrates) has become more prominent since the 1980s, with many gold discoveries often including ores that are wholly or partially refractory.

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Microwave pretreatment of a double refractory gold ore ...

On the other hand, the refractory gold ores cannot be effectively treated by the cyanidation process (Marsden and House, 1992). Vaughan (2004) has further categorized the refractory gold ores into two groups: (1) locked gold ore and (2) reactive gangue mineralogy.

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Autoclave Technology - Hatch

Challenges. Some ores require a high-temperature, high-pressure pretreatment process before leaching in order to improve metal recovery from the complex ore.

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microwave pretreatment of a double refractory gold ore

refractory gold pretreatment Microwave pretreatment of a double refractory gold ore 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.

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