Our sulphide ore refractory

Recovery of Gold in Pyritic Sulfide Ores - Mine …

Recovery of Gold in Pyritic Sulfide Ores The now extinct Us Bureau of Mines conducted numerous studies of gold in pyrite, and sulfide ores over the years, until their untimely demise in the 1990's.

Refractory Sulfide Ores—Case Studies - ScienceDirect

Whole-ore roasting was the first process used at Ashanti for treatment of refractory ores, and was attractive because of the difficulties in achieving good flotation recovery at a high concentration ratio. Whole-ore roasting with oxygen (Freeport process) was also noted to have the ability to capture and fix arsenic in the roaster bed, a major environmental advantage.

sulphide gold ore processing - africar-hire.co.za

Improved recovery of a low-grade refractory gold ore using flotation . To improve the recovery of low-grade refractory gold ores, flotation should be fine gold particles may be highly disseminated and locked up in sulfide minerals such either treating the whole ore or processing some form of concentrate into

Characterizing Gold in Refractory Sulfide Gold Ores and ...

20 JOM • December 2002 Fine Particle Characterization Characterizing Gold in Refractory Sulfide Gold Ores and Residues T.T. Chen, L.J. Cabri, and J.E. Dutrizac

(PDF) Bacterial Leaching as a Pre-treatment Step for Gold ...

In this article, pre-treatment such as bio-leaching before cyanidation is discussed as an alternative technique to treat refractory gold ores containing pyrite and arsenopyrite.

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 ...

Effect of Pretreatment of Sulfide Refractory Concentrate ...

torily, classified as refractory ores, that require long leach without reaching satisfactory results. To achieve the extraction of precious metals several pretreatments are required. For extraction of gold from refractory ores or concen- trate, in which gold is surrounded or covered by iron sul- fide minerals, mainly arsenopyrite and pyrite, mineral oxidative pretreatment is essential to ...

Copper extraction - Wikipedia

Sulfide ores. Secondary sulfides – those formed by supergene secondary enrichment – are resistant to sulfuric leaching. These ores are a mixture of copper carbonate, sulfate, phosphate, and oxide minerals and secondary sulfide minerals, dominantly chalcocite but other minerals such as digenite can be important in some deposits.

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.

Pressure chloride leaching of a refractory gold ore

Refractory gold ores have poor gold recoveries with direct cyanide leaching. Typically the refractoriness is due to encapsulation of the gold particles inside the host mineral. To liberate gold ...

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES

ECONOMICS OF REFRACTORY GOLD ORE PROCESSES John E. Litz and R. Wayne Carter 119th TMS Annual Meeting February 18-22, 1990 Hazen Research, Inc. 4601 Indiana Street Golden, Colorado 80403 Abstract Refractory gold ore pretreatment processes continue to receive much attention. This paper compares the relative economics of treating ores by oxygen pressure oxidation, roasting and …

CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF REFRACTORY …

This shows that the ore is a sulfide refractory gold ore (Saba et al., 2011). Chloride – hypochlorite oxidation and leaching of refractory sulfide gold concentrate 65

ALACER GOLD TO PURSUE POX AS SULFIDE ORE PROCESSING METHOD

characteristics of the refractory sulfide ore present at Çöpler. The highly refractory nature of the Çöpler sulfide The highly refractory nature of the Çöpler sulfide ore means that poor gold recoveries result when using conventional cyanidization, even when fine grinding is

Processing of Konkola copper concen- trates and Chingola ...

Processing of Konkola copper concentrates and Chingola refractory ore year. Reserves are sufficient for a life of mine in excess of 30 years. This paper describes the testwork and engineering

Sulphide Gold | Gekko

Gekko's Approach. Laboratory testwork must be completed on the ore body. It's important to characterise the presence of coarse sulphides or dissociated sulphides, as well as find out whether the ore is refractory or not, and what grade (g/T) the ore is.

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

III. Classification of refractory ores. 1. Carbonaceous gold ore. There is organic carbon which can do'Rob gold'in gold and silver ore, and it causes that gold is adsorbed in the cyanide ...

First refractory sulphide gold ore processed at Alacer's ...

Alacer Gold Corp has announced the processing of the first sulphide ore through the sulphide plant at the Çöpler mine in Turkey, with the first autoclave coming online over the …

Leachox™ Refractory and Sulphide Gold Process | …

A 3D model showing a proposed MMS Leachox™ Plant with four columns and four Aachen Reactors (Click to here to view a large image) MMS has successfully developed the Leachox™ Process for the treatment of sulphide gold ores.

Rebellious Ores: Sulfides, Selenides and Tellurides

The early day miners feared it, and it happened a lot more often than they would have liked: the easily worked rich surface ores they discovered on the surface gave way as they mined downward, to a vein full of sulfides, base metals and other nasty, rebellious and refractory ores.

Robust, low-cost BIOX process at Fosterville gold mine ...

Challenge. Refractory gold ore, yielding low (<10 %) gold recovery on direct cyanidation; High level of sulphide oxidation to achieve commercially acceptable gold recovery

Recovery Refractory Resources - sgs.com

Roasting is generally applied to sulphide minerals and refractory ores. It involves a thermal gas-solid reaction during which sulphides and sometimes organic carbon are oxidised to SO 2 and carbon dioxide (CO 2) at temperatures between 500ºC and 700°C. Mr Runkel of Outotec says: "Roasting plants can be designed with a throughput up to 5,000t/d or higher per line, depending on the ore ...

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

Pre-Oxidation of a Refractory Sulphide Gold Ore in ...

The Eldorado Gold Corp. has developed a method of treating a hard-to-process ore from a mine in China in order to increase their recovery of gold. While this process has proven to be effective, more research is needed on the exact method in which this technique works on a very small-scale and detailed basis. The research that will be undertaken ...

ALTA Gold 2012 E-Doc - albionprocess.com

252 The high throughput ore B comprise predominantly of pyrite and small copper sulphide minerals as the main gold carriers with quartz, dolomite, muscovite, feldspars the main gangue components.