treatment of refractory gold ores and silver

Diagnostic Leaching For Refractory Gold Ores | SRK Consulting

Diagnostic Leaching For Refractory Gold Ores Several different permutations of diagnostic leach tests depend on specific objectives, but they generally involve the sequential leaching of a gold ore sample with progressively stronger reagents, producing a qualitative assessment of the gold …

Characterization of refractory behaviour of complex gold ...

dissolve gold+silver tellurides[24]. In this study, the amenability of a refractory gold/silver ore to cyanide leaching for the recovery of gold and silver was investigated. Diagnostic leaching of the ore was performed to distinguish the gold-bearing phases present and hence, to characterize its refractory …

Processing technologies for gold-telluride ores | SpringerLink

Gold telluride ores are important gold refractory ores due to the presence of sulfides and other gangue materials. The classification and main physical properties of gold telluride ores were described, and possible treatment methods including flotation, leaching, and oxidation were reviewed. The results show that flotation procedures are much easier for gold tellurides compared to other ...

Improved gold and silver extraction from a refractory ...

The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20 g/t Au and 220 g/t Ag and contained predominantly quartz/clay and barite, and to a lesser extent, sulphides such as pyrite, stibnite, sphalerite, zinkenite (Pb 9 Sb 22 S 42) and andorite (Sb 3 PbAgS 6).The latter mineral was identified to be the most important ...

pretreatment of refractory ores in gold leaching process congo

Processing technologies for gold-telluride ores | SpringerLink. This study deals with provided that gold is coarse enough to the alkaline sulfide leaching as an Gold ores are commonly classi- be physically and economically liber- alternative pretreatment method fied as free-milling and refractory for antimonial refractory gold and ated. ores based on the metallurgical per- silver bearing ores.

Treatment of Refractory Gold Ores - XPS

Treatment of Refractory Gold Ores Extractive Metallurgy Once the cause has been identified, there are a number of alternatives for treating the ore. Firstly, the gold can be made more amenable to cyanidation by ultra-fine milling, followed by a hot atmospheric leach –the Albion Process.

Unlocking refractory gold ores and concentrates

The successful treatment of gold and silver ores is always a matter of economics, but it is not always a matter of grade, or metal content. ... provide incentives attractive enough to justify greater investment in the development of effective treatments for refractory gold ores and concentrates. ... Bibtex entry for this abstract Preferred ...

Gold ore processing : project development and operations ...

Gold Ore Processing: Project Development and Operations, Second Edition, brings together all the technical aspects relevant to modern gold ore processing, offering a practical perspective that is vital to the successful and responsible development, operation, and closure of any gold ore …

Patents Assigned to Barrick Gold Corporation - Justia ...

Patents Assigned to Barrick Gold Corporation ... Process for recovering gold and silver from refractory ores. Patent number: 7922788 Abstract: The present invention is directed to ... MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY GOLD ORES. Publication number: 20090158893

Refractory Gold | Mining | SGS

Also, grinding the ore to an extremely fine particle size can liberate gold encapulsated in sulfides. SGS has very extensive experience with all the unit operations involved in the processing of refractory gold ores, and in selecting the optimum flowsheet for a particular ore. Our gold metallurgy expertise is second to none. Chemical interference

pretreatment of refractory gold ore

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 …

Microbial Pretreatment of Refractory Gold Ore - Xinhai

For coarse grain size of gold after crushing and grinding by flotation, gravity concentration, cyanide leaching process or several process combined treatment will be able to complete the separation of gold and gangue minerals, but there are some curing refractory gold ores due to coarse size or thin and gangue minerals symbiosis relations complex factors through the above process unable to ...

Refractory Gold Ore Treatment Methods

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 ...

Gold Ore Carbonaceous - HeNan FUMINE Heavy Industries Co ...

Treatment Of Carbonaceous Refractory Gold Ores. Underlying the difficulty of processing refractory gold ores is their mineralogy. This type of ore may have 1 gold in intimate association with and locked in sulphide minerals 2 gold associated with carbonaceous matter capable of adsorbing aurocyanide and 3 gold

Bio-treatment of Refractory Gold Ore in Obuasi Mines

The Plant has seen a number of upgrades and modifications in its circuits which were motivated by cost, operational and throughput constraints.The objective of this paper is therefore to highlight the mine's experience in the treatment of its complex carbonaceous refractory sulfide gold ores with emphasis on plant operations and improvements ...

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.

Refractory gold - latest developments in Biological ...

Hear about a robust, easy-to-operate and sustainable technology for treatment of refractory gold concentrates. Plus we discuss latest developments in BIOX, a technology with 30+ years of commercial operation. Topics include 1. Refractory gold processing o...

(PDF) Cyanidation of Refractory Gold Ores: A Review

The degree of refractoriness has been classified based on the proportion of gold recovered (Table 1) (Marsden and House, 2009 The gold in refractory sulfide gold ores is surrounded by sulfide ...

Recovery Refractory Resources - SGS

most common pre-treatment options, and speaks to some companies that offer or use the processes A refractory gold ore is gold-containing ore that is resistant to recovery by direct cyanidation and carbon adsorption processes. More specifically, it is an ore that has a gold recovery rate of less than 80% when direct cyanidation is applied to it.

Roasting and Refractory Gold Ore - Manhattan Gold & Silver

Jul 16, 2014· Luckily, the gold contained in refractory ores is not unsalvageable. Gold's resistance to oxidation is a critical point of most refining and extraction methods, and the roasting process is no exception. During roasting, refractory gold ore is treated with extremely hot air. This causes the sulfites to oxidize, separate from the ore, and ...

Treatment of pyritic matrix gold–silver refractory ores by ...

From the cyanidation point of view, gold and silver ores can be classified as free milling, and refractory ores. The term "refractory ore" defines those materials that when submitted to a conventional cyanidation process, show low recoveries (<80%) or high consumption of reactants [Weir, D., Berezowsky, M., 1984.

NIOSHTIC-2 Publications Search - 10011577 - Treatment of ...

The U.S. Bureau of Mines investigated treatment of gold and silver refractory ores and concentrates that respond poorly to conventional cyanidation techniques owing to the complex mineralogy of the ore. Three types of ores were investigated: gold-locked placer sands, gold locked in sulfides, and gold that is robbed from the pregnant cyanide ...

Patents Assigned to Barrick Gold Corporation - Justia ...

Abstract: The disclosure relates to pre-treatment of precious metal-bearing oxide ores, prior to precious metal leaching by thiosulfate. The process comprises mixing oxide ore in oxygenated water in the presence of a carbon-based material (e.g., activated carbon or other type of carbon).

ALTA Gold 2012 E-Doc - Albion Process

A significant contemporary challenge for gold mining companies is to define economic process options for treating more complex ore bodies as the less refractory ores become depleted. Demonstration of economic treatment options allows gold companies to maintain and increase their ore reserves.

Fungal pretreatment of sulfides in refractory gold ores ...

Changes in sulfide sulfur concentration and the formation of oxide phases during fungal treatment were confirmed using Raman spectroscopy and X-ray diffraction analysis. These results suggest that P. chrysosporium is a potential microorganism for oxidative decomposition of metal sulfides associated with refractory gold ores.

PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE …

Pressure oxidation is employed to liberate gold and silver in refractory sulfide concentrates often and ores. The main pressure oxidation products from iron sulfide minerals are sulfuric acid (and metal sulfates) and hematite. Depending on the conditions within the …

Treatment of Refractory Gold Ores | SpringerLink

The treatment of refractory gold ores containing carbonaceous material and sulfides. In Gold and Silver Leaching: Recovery and Economics, edited by W. J. Schlitt, W. C. Larson, and J. B. Hiskey. New York: SME-AIME, 17–22.

Pretreatment Process on Refractory Gold Ores with As

Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.

(PDF) Implementation of sodium hydroxide pretreatment for ...

The recovery of precious metals such as gold from refractory ores has received considerable attention [2][3][4][5][6]. To achieve a satisfactory recovery, a pretreatment stage is required to break ...

Pressure Oxidation of a Refractory Sulfide Concentrate and ...

Significant advances have taken place in the treatment of refractory gold ores and concentrates during the past decade. In sulfide ores, pyrite is the most common host mineral for gold. Studies by Gasparrini (1983) showed that gold occurs in pyrite as native gold or electrum in all sizes and forms. Arsenopyrite is probably the second most common host for gold and forms similar associations ...