Keywords gold ore hydrometallurgy leaching factorial design Introduction Many of the gold deposits today contain gold finely disseminated in iron sulfide min erals such as pyrite and arsenopyrite Such deposits are known as refractory gold ores due to encapsulation of fine gold particles in the host mineral Iglesias and Carranza

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Then gold is extracted from the anode slimes In the direct smelting process refractory gold ores are smelted directly with gold enriched into ferrous matte Then gold is extracted from ferrous matte Based on the direct smelting process the metallurgy beneficiation united process for refractory gold ores

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The experimental ore belongs to a kind of typical high sulfur ore which makes it to be a refractory ore The copper in the ore has a relative high grade which comprehensively reaches 3 78 with

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Abstract It is well known that the gold ores containing a high content of arsenic and antimony are very refractory In this paper the adverse effect of antimony on the extraction of gold by pretreatment cyanide leaching was discussed in detail

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The treatment of gold ores in particular the competing technologies and their relative advantages and economics is a major focus within the industry A common issue is the increasingly refractory and complex nature of the ores being treated This chapter originally written in 2005 gives an overview of the key process options

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Gold ores are typically amenable to sensor based ore sorting to some degree and this is usually accomplished with XRT or laser sensors or a combination of both A two step sorting flow sheet consisting of an XRT rougher plus a laser scavenger or alternatively a laser rougher and an XRT scavenger has already proved an optimal recovery

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Processing smelting and refining gold With ores of higher gold content greater than 20 grams of gold per tonne of ore cyanidation is accomplished by vat leaching which involves holding a slurry of ore and solvent in large tanks equipped with agitators

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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 Dr Chris Fleming senior metallurgical consultant at

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Pressure Oxidation is a process for extracting gold from refractory ore The most common refractory ores are pyrite and arsenopyrite which are sulfide ores that trap the gold within them Refractory ores require pre treatment before the gold can be adequately extracted The pressure oxidation process is used to prepare such ores for conventional gold extraction processes such as cyanidation

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Refractory gold Free Online Library

Refractory gold ore is generally defined as ore containing gold which cannot be satisfactorily recovered by basic gravity concentration or by simple cyanidation To put numbers to it ores that yield gold recoveries of less than 80 when using CIL or cyanidation are refractory Such ores are typically pyritic arsenopyritic and carbonaceous

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The value of Canada s exports of gold in metal ores and concentrates increased to 806 7 million in 2018 up from 754 0 million in 2017 Imports The value of gold imports into Canada was 7 9 billion in 2018 Canada imported 168 tonnes of gold in unwrought form in 2018 valued at 6 2 billion

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Case made for high pressure roll grinding in gold plants Mining Engineering Vol 47 No 6 June 1995 pp 524 529 Baum W 1990 Mineralogy as metallurgical tool in refractory gold ore process selection and optimization Proceedings Randol Gold Forum 90 September 13 15 1990 Reno Tahoe pp 35 38


Carbonaceous ore and other forms By connection with other minerals Free gold it can be extracted by gravity separation flotation chemical separation Splice of gold gold can be extracted by flotation chemical separation Gold that enclosed in a mineral or inside the crystal lattice gold can be extracted by flotation pyrometallurgy


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The discovery of gold and other minerals brought thousands of miners of the west was preferred for railroad tracks and iron was preferred by locomotive boilers coal iron ore and are necessary resources fot the production of steel

Gold extraction QueensMineDesignWiki

Among free milling gold ores placer gold is a special case as there is no pre treatment required for gold extraction Gold can be extracted from placer ores using physical separation techniques particularly through gravity treatment In modern practice concentrators use centrifugal force in order to liberate finer gold

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