of refractory gold minerals and locking of submicroscopic gold in sulfide mineral structure etc Gold process mineralogy helps address issues and problems related to gold ore processing It provides useful information on process selection flowsheet development recovery improvement and reagent consumption nbsp …

Froth flotation is usually applied when the gold present in an ore is closely associated with sulfide minerals such as pyrite chalcopyrite or arsenopyrite and when such sulfides are present in large quantities in the ore In this case concentration of the sulfides results in concentration of gold values Generally recovery of the nbsp …

Much of the referenced studies and case applications discussed in this brief article came from USMB reports which even after they ceased to exist still continue to provide some good scientific information to those working in the mining and mineral processing industries Sulfide ores and pyrites in particular have caused nbsp …

The Bureau of Mines investigated a hydrometallurgical procedure to re cover gold silver and byproduct lead from a complex lead zinc sulfide ore A ferric chloride FeCI3 preleach at 40° C in 6 h extracted about 50 pct of the zinc and formed insoluble silver and lead chlorides Subsequent acid thiourea leaching for 1 to 3 nbsp …

An usual approach for processing complex refractory gold ores is a pre oxidation treatment prior the gold leaching step and the most known options are roasting pressure oxidation and bioxidation6 8 Pressure oxidation is a technology where sulfuric acid can play an important role for oxidising arsenopyrite effectively9 11 …

To complicate matters further these ore bodies are often refractory where the gold is locked within sulphide minerals or double refractory in which gold is locked within sulphide minerals and preg robbing due to the presence of organic carbon These must be pretreated ahead of leaching In recent years the industry has nbsp …

Cyanide leaching of the ore consistently resulted in low extraction of gold 49 and silver 18 confirming the refractory nature of the ore Alkaline sulphide treatment of the ore under suitable conditions was shown to leach out up to 85 Sb which remarkably improved the extraction of silver from lt 18 up to 90 Ag in nbsp …

If use conventional cyanidation gold extraction process the gold leaching rate is very low Because In ores with a high sulphide content this treatment involves the production of sulphuric acid Kyuesi and Haque etc have studied the role of microwave in the gold extraction process of arsenic bearing refractory gold ore …

Sulphide Gold When properly characterised sulphide complex gold ores can be efficiently processed using a Gekko flowsheet design The IPJ a classic pre concentration device is effective in gangue rejection prior to further processing of valuable gold bearing material Other turnkey modular systems for nbsp …

23 Mar 2012 Introduction Sulphide minerals are one of the most important sources of value metals such as gold silver copper zinc etc Due to the strong sulphur binding to these minerals metals are usually extracted by pyrometallurgical route or hydrometallurgy with chemical oxidation Of these hydrometallurgy nbsp …

other metallic impurities namely copper gold iron and zinc is eliminated by choosing an appropriate electrolysis potential Key Words Silver recovery silver extraction thiosulphate leaching Introduction Precious metals such as gold and silver have traditionally been recovered from ores by leaching with alkaline cyanide nbsp …

26 Jun 2009 many years ago I found a litle of that stuff too I mean of sulphates ore concentrates in an abandoned and almost dismantled gold mine processing plant I just put that green yellowish powder in an an old iron pot an roasted it on a camp fire until turned black and magnetic I won 39 t do that any more because nbsp …

17 Mar 2017 Problem with gold recovery from sulphide ore How may a mill get the maximum recovery of gold from a sulphide ore at the least capital cost and at the same time A Flowsheet to recovery gold from sulfide ores Sulphides require very fine grinding for maximum extraction then are returned to circuit …

gold by sulphide minerals In practice this means that below the critical concentration of cyanide gold extraction decreases significantly The Musselwhite Mine plant originally designed at 3 300tpd processes a free milling gold ore containing pyrrhotite as the primary sulphide at a present throughput of 3 650t d The ore is nbsp …

The mining of alluvial deposits and later lode or vein deposits required crushing prior to gold extraction and this consumed immense amounts of manpower When present in sulfide ore bodies the gold although still elemental in form is so finely disseminated that concentration by methods such as those applied to nbsp …

Abstract The treatment process of a low grade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work The gold extraction of this ore by all sliming cyanidation was only 11 75 Hence a pretreatment was necessary In this paper a flotation preoxidation cyanide leaching process nbsp …

MlRL Report No 84 FERRIC CHLORIDE LEACHING OF THE DELTA SULFIDE ORES AND GOLD EXTRACTION FROM THE LEACHING RESIDUE BY H K Lin and P D Rao Mineral Industry Research Laboratory School of Mineral Engineering University of Alaska Fairbanks Fairbanks Alaska 99775 1 180 nbsp …

26 Apr 2007 The processing of gold bearing sulphide minerals which contain arsenopyrite and other complex arsenic sulphide minerals results in arsenic containing emissions and effluents which must be given careful consideration in relation to clean air and clean water standards The sources of arsenic and the nbsp …

This KS3 education resource looks at copper mining extraction and pyroprocessing of sulfide ores …

19 May 1992 Gold and silver are extracted from their elemental state or from complex ores and alloys by leaching them with a solution containing ammonia ammonium salts and one or more oxidants The process is particularly effective for refractory gold ores including sulfide and carbonaceous ores …

25 May 2016 Any further queries please feel free to contact me at Email sales1 frjig com WhatsApp 86 18037167566 website http www frmining com http www frjig com …

In refractory ore gold is locked in the sulphide minerals so that to achieve satisfactory levels of gold recovery additional processing such as roasting or biological leaching is required before cyanidation Sulphide minerals in refractory ores are converted to oxides by either nbsp …

17 Mar 2017 How and why do we produce gold and copper concentrates On Friday 3rd March the Ministry of Energy and Minerals issued a press release stopping the export of mineral sands on the basis that companies should be investing in building smelters in Tanzania for further processing rather than shipping nbsp …

Golden Mile ore is of two main types weathered oxide ore from near the surface which is free milling with the gold easy to extract and sulphide ore in deeper ore bodies where the majority of the gold is locked as inclusions in tellurides and pyrites and is difficult to extract In the sulphide or telluride ore the gold is chemically nbsp …

MMS has successfully developed the Leachox™ Process for the treatment of sulphide gold ores The vast majority of refractory gold deposits are of lower grade and whilst many could contain enough reserves to sustain a high cost extraction process invariably extensive drilling to determine this does not justify the nbsp …

17 May 2009 Topic 3 Ore processing and metal recovery From a series of 5 lectures on Metals minerals mining and some of Heap leaching – processing oxidised or sulphide ore Cyanide solutions react with gold and silver Cyanide solutions do not react with oxide minerals Cyanide solutions do react with nbsp …

88 no 4 Apr 1988 pp 117 130 The extraction of gold from sulphidic concentrates by roasting and cyanidation by J J ROBINSONt SYNOPSIS The refractoriness of the gold in many of the pyritic ores from the eastern Transvaal i due mainly to the asso ia tion between the gold and the sulphides but it can be due to the nbsp …

This batch model was extended to a continuous model that simulated three leaching and seven carbon in leach tanks The effect of processing the oxide and sulphide ores studied was examined and the model shown to satisfactorily describe the extraction of gold from the Telfer oxide ore A sensitivity analysis of the effect nbsp …

A well established method for treating refractory gold ores in which the gold is locked up inside fine sulphides is to treat the sulphide concentrate produced the circumstances outlined but it appears that ice the salt reacts with the stibnite or berthierite in such a way as to prevent its interference with the extraction of gold by nbsp …

Abstract Cyanidation is a relatively simple and cheap technology to treat gold containing ores However this process is not completely effective in refractory gold bearing sulfide ores In the case of very low grade ores biooxidation is an attractive alternative pre treatment to render the gold amenable to extraction …

The process The ore is ground and crushed and any free gold is extracted by use of gravity as it may be too large to react readily with the cyanide If the gold ore contains other metals and or sulphide minerals it may require additional treatments prior to the leaching process The treated gold then has sodium cyanide added nbsp …

Gold has varying modes of occurrence in sulphide ores ranging from being disseminated and interstitial in minerals such as lead and copper in oxide ores particularly as disseminated particles and as free milling gold or association with tellurides Where the gold is intimately associated with various sulphide minerals nbsp …

20 Oct 2014 Mineralogy A correct understanding of the mineralogical characteristics of the ore is the key element to successful extraction of gold from its host rock Mineralogical factors that can substantially alter the performance of cyanide leaching are complex and can include Sulphide Minerals Some sulphide nbsp …

Sometimes gold recovery from its ores represents a cha llenge This is due to fine dissemination and interlocking of the gold within the associated sulfide minerals Many approaches were tried to solve this problem they includ ed roasting oxidation in addition to bioprocessing In the last approach application of bacteria nbsp …

15 Feb 2015 Mineral Processing Department Faculty of Mines Istanbul Technical University Istanbul Turkey even itu edu tr Abstract The leaching behaviour of a sulphide gold silver ore was investigated in terms of a relationship between gold and silver extractions and cyanide consumption Ninity five Au and nbsp …

4 Nov 2013 TORONTO Nov 4 2013 CNW Alacer Gold Corp quot Alacer quot or the quot Corporation quot TSX ASR and ASX AQG is pleased to announce its intention to pursue whole ore pressure oxidation quot POX quot as the processing method for sulfide ore at its Çöpler Gold Mine in Erzincan Province Turkey Alacer recently nbsp …

1 Oct 2008 Sample of a sulphide ore containing gold A sulphide reduction process SRP that enables 39 fast and cheap 39 extraction of gold from sulphide ores is available from Haber Inc based in Arlington USA Most gold extraction uses toxic chemical leaching involving mercury or cyanide The SRP approach does nbsp …

ABSTRACT Alternative methods of processing the refractory gold sulfide ores and concentrates were worked out The gold containing refractory sulfide ores of chalcopyrite pyrite barite polymetallic quartzites copper zinc antimonite were used in the research As a result of investigation the optimal conditions of gold nbsp …

Figure 3 Precious metal extraction following cyanidation on both Ore A and Ore B samples Oxidation of Sulfides – Liberation of Gold and Silver Most refractory gold ores and sulphide concentrates require some degree of oxidation of the sulphides to liberate gold locked as 39 solid solution 39 or as very fine inclusions in the nbsp …

Some prospectors are interested in the methods of processing sulfide ores to extract their values The two of the best known processes are smelting and roasting The two are actually different methods but both involve heating the ore to high temperatures Technically any methods which consist of processing ore by heating nbsp …