·The treatment of refractory gold ores containing carbonaceous material and sulphides [C] K OSSEO ASARE et al Carbonaceous matter in gold ores Isolation characterization and adsorption behavior in aurocyanide solution [C] Characterization of Goldstrike ore carbonaceous material part 1[J] Minerals and Metallurgical Processing 1999
The presence of carbonaceous materials in gold ores is a source of worry to gold mining companies due to its ability to interact with and adsorb auro cyanide complexes during cyanidation with a consequent decrease in overall gold recovery termed as preg robbing and BROSNAHAN Characterisation of Goldstrike ore carbonaceous
Gold ores are classified free milling and refractory based on their response to cyanide dissolution Bioprocessing can be used to treat refractory gold bearing sulfide ores as well as carbonaceous gold ores It is essential to characterize different types of gold ores to understand the extent and nature of gold entrapment in different associated mineral phases before an
The refractoriness of gold ores occurs by occlusion or entrapment of subatomic gold particles in matrices of sulfide minerals pyrite arsenopyrite stibnite etc and insoluble siliceous gangue by association with tellurides clays and carbonaceous matter [] The carbonaceous material can adsorb gold an effect known as preg robbing from the solution similar to activated carbon
·Asamoah RK Zanin M Skinner W Addai Mensah J 2019 Refractory gold ores and concentrates part 2 gold mineralisation and deportment in flotation concentrates and bio oxidised products Min Proc Ext Met Under Review
·Preg robbing is an important phenomenon that inhibits gold recovery due to the presence of naturally occurring carbonaceous matter In case of certain ores gold recovery by cyanidation is limited by the presence of naturally occurring carbonaceous material that adsorbs gold from alkaline cyanide solution unless steps are taken to prevent this adsorption reaction
·Ores which contain naturally occurring carbonaceous material preg robbing ores is an example of one such ore type Newmont s Jundee operation contains zones of carbonaceous ore within the oxidised ore body
·Refractoriness in gold ores may be caused by several factors including the presence of sulfides tellurides cyanicides and carbonaceous matter Boyle 1979; Guay 1981 When it is due to the presence of both sulfides and carbonaceous matter CM the ore is said to be double refractory Nyavor and Egiebor 1992 In such ores gold particles may
·Heap leaching accounts for approximately 17% of global gold and 21% of global copper production respectively Marsden and Botz 2017; Basov 2015 It is the only economic technology available to extract value metals from low grade ores; however the slow rate of recovery is a major drawback and in most cases is related to heap permeability Petersen
The presence of carbonaceous materials in gold ores is a source of worry to gold mining companies due to its ability to interact with and adsorb auro cyanide complexes during cyanidation with a consequent decrease in overall gold recovery termed as preg robbing Characterization of Goldstrike ore carbonaceous material Part 1 chemical
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