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A new technology to improve gold recovery in the processing of double refractory ores, which often resulted in native carbon competing with activated carbon and limiting gold recovery – commonly ...
telluride deposits. Gold deportment studies for these ores are different and easier than complex coppergold and double refractory gold ores. The gold ore body in this investigation is in northeastern Nevada, United States and is commonly known as a Carlin type deposit, after the Carlin ore body. Mineralization covers an extensive area and
Abstract. Problem ores that yield low (say less than 80%) gold recovery by cyanidation when "normally ground" are defined as term, as well as the technical methods used to treat such ores, are relatively new.
May 01, 2013· Read "Mycohydrometallurgy: Biotransformation of double refractory gold ores by the fungus, Phanerochaete chrysosporium, Hydrometallurgy" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
of double refractory gold ores and concentrates. Currently numerous studies are in progress to further improve upon the efficiency of the bacterial process and to investigate the potential of other microorganisms. In this study, microbial pretreatment of double refractory gold ore (sample A) and
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, antimony, tellurium, and .
May be increasing gold recovery from refractory gold ore (with grade 23 g/t) to 9095%?Actual data of top refractory gold ore mines show, that gold recovery is 70% and less. What is reason? It is a problem in minerals processing or it is a global science problem? So if you work with refractory ore,
Ores where gold is associated with sulfides and with high carbonaceous matter content are considered double refractory. Ores in the Carlin Trend District are characterized by the presence of submicroscopic gold (invisible gold) finely disseminated within a sulfiderich matrix within carbonaceous material.
The treatment process of a lowgrade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work. The gold extraction of this ore by allsliming cyanidation was...
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 .
The initial results for the cyanide leach gold recoveries were very poor on a highgrade primary sulphide ore of g/t Au with no silver. Subsequent mineralogy showed the ore to be a characteristic pyrite, carbonaceous refractory gold ore (double refractory). This was a very disappointing finding. A small scale gravity and flotation test programme...
of refractory and double refractory gold ores. Commonly, in these types of ores, the gold is associated with sulphide minerals. The presence of sulphides can affect gold recovery via cyanidation due to encapsulation or passivation of the gold, thereby increasing reagent consumption. In the case of double
A twostage bacterial pretreatment process for double refractory gold ores Amankwah a,*, W.T. Yen a, Ramsay b a Mining Engineering Department, Queen''s University, Kingston, Ontario, Canada K7L 3N6 b Chemical Engineering Department, Queen''s University, Kingston, Ontario, Canada K7L 3N6 Received 7 April 2004; accepted 11 May 2004 Abstract Double refractory gold concentrates were ...
Double refractory gold ores (DRGO) contain metal sulfides that encapsulate gold and prevent its dissolution by cyanide, and carbonaceous matter (CM) that adsorbs gold cyanide complex. Pretreatment is therefore required to decompose the sulfides and liberate gold before cyanidation, and
iii ABSTRACT Roasting of double refractory ores found in the Carlin Trend is necessary to oxidize the sulfides and remove the organic matter prior to leaching for gold extraction.
Method to improve recovery of gold from double refractory gold ores Download PDF Info Publication number USB2. USB2 US12/208,985 USA USB2 US B2 US B2 US B2 US A US A US A US B2 US B2 US B2 Authority US United States Prior art keywords
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 pregrobbing due to the presence of organic carbon. These must be pretreated ahead of leaching.
The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media. USA1 Microbial pretreatment of double refractory gold ores Google Patents Microbial pretreatment of double refractory gold ores Download PDF Info Publication number ...
double refractory ore has been achieved at Nordgold''s Suzdal mine in Kazakhstan which treats double refractory ore with both visible and invisible gold hosted in sulphide associations of pyrite and arsenopyrite, and also carbonaceous black shale. Following extensive laboratory and demonstration scale testing of the Outotec
and pyritesolid solution gold atomically distributed in the crystal structure sulphide minerals •Naturally occurring active carbon which results in pregrobbing . Gold may be exposed to cyanide solution for leaching but recovery is inhibited by the gold getting adsorbed onto carbon •Double refractory are concentrates or ores in which gold is
With regards to the application of microwaves to refractory gold ores, Haque, 1987a, Haque, 1987b has studied the microwave pretreatment of refractory sulphidic ores and achieved gold extractions of over 98%. However, there is no information published on the microwave processing of the double refractory gold ores.
Request PDF on ResearchGate | DoubleRefractory Carbonaceous Sulfidic Gold Ores | Ores where gold is associated with sulfides and with high carbonaceous matter content are considered double ...
Mar 19, 2009· The invention relates generally to recovery of gold and/or silver and particularly to recovery of gold from refractory and double refractory materials. BACKGROUND. Many precious metal deposits currently processed throughout the world are sulfidic in nature, and present challenges in the extraction and recovery of the contained gold.
The results for the cyanide leach gold recoveries were very poor on a high grade primary sulphide ore of g/t Au with no silver. Subsequent mineralogy showed the ore to be a characteristic pyrite, carbonaceous refractory gold ore (double refractory).
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