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. These refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold.
Feb 16, 2015· Extraction of Gold from a Low‐Grade Double Refractory Gold Ore Using Flotation‐Preoxidation‐Leaching Process. Yongbin Yang. School of Minerals Processing & Bioengineering, Central South University, Changsha, Hunan 410083, China. Search for more papers by this author. Shiqian Liu.
Sep 07, 2017· In the case of Goldstrike, this was a double-refractory ore combining sulphide-occluded gold with preg-robbing carbonaceous material that rendered the ore unsuitable for conventional cyanide leaching and carbon adsorption.
In this paper, the effect of the oxidative pretreatment and lead nitrate addition on the cyanidation of Zarshuran refractory gold ore containing 3.32 ppm Au, 1.09% As, and 0.5% sulfur 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 to deactivate CM and prevent it from adsorbing gold during ...
US-2009158893-A1 chemical patent summary.
The present application claims the benefits of U.S. Provisional Application Ser. Nos. 60/990,805, filed Nov. 28, 2007, and 61/088,928, filed Aug. 14, 2008, both entitled "Microbial Pre-Treatment of Double Refractory Gold Ores", both of which are incorporated herein by this reference in their entireties.
10%· R. Badri and P. Zamankhan, "Sulphidic refractory gold ore pre-treatment by selective and bulk flotation methods," Advanced Powder Technology, 24 …
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 refractory ores, gold recovery is ...
Other articles where Refractory ore is discussed: gold processing: Extraction from refractory ores: Many gold-bearing ores and concentrates are not readily amenable to cyanidation, owing to the presence of substances that consume the cyanide reagent before it can dissolve the gold, preferentially adsorb the gold as it dissolves (a phenomenon called preg-robbing), or completely surround the…
Carbonaceous sulfidic gold ores are commonly double refractory and thus require pretreatment before gold extraction. In this paper, the capacity of pre-bio-oxidation can simultaneously decompose sulfides or deactivate carbonaceous matters (CM) from a double refractory gold ore (DRGO) using pure cultures of A. ferrooxidans or L. ferrooxidans, and a mixed culture containing Acidithiobacillus ...
A double refractory gold ore usually contains both sulfide minerals and carbonaceous matter and results in very low gold extraction. The micro-sized gold particles are enclosed inside the mineral ...
Highly refractory gold mineralisation – including double refractory ores, i.e. gold associated with both sulphide and carbonaceous mineralogy. Low to middle-tier resources that target a gold production of less than 150,000 oz per annum.
Corpus ID: 97039357. MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY GOLD ORES @inproceedings{Afidenyo2008MICROBIALPO, title={MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY GOLD ORES}, author={James Kofi Afidenyo}, year={2008} }
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.
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 pre-treatment of double refractory gold ore (sample A) and
Method to improve recovery of gold from double refractory gold ores Download PDF Info Publication number US8262768B2. US8262768B2 US12/208,985 US20898508A US8262768B2 US 8262768 B2 US8262768 B2 US 8262768B2 US 20898508 A US20898508 A US 20898508A US 8262768 B2 US8262768 B2 US 8262768B2 Authority US United States Prior art keywords fraction
Nov 12, 2020· A brief analysis of the existing and developed methods for processing refractory- and double-refractory gold raw materials showed the futility of focusing on the existing modern technological schemes, which, despite being considered effective, in many cases are fundamentally incapable of providing efficient processing of such ores [5,6,7,8,9,10,11,12,13,14,15].
Jan 01, 2016· Ores in which gold is associated with sulfides and with high carbonaceous matter content are considered double refractory. The northern Nevada region in the United States is a main area where this type of ore is found. Ores in the Carlin Trend District are characterized by the presence of submicroscopic gold (invisible gold) finely disseminated ...
There are a number of factors that cause refractory behaviour in gold ores. Typically when we start investigating these ores the first step would be to undertake a mineralogical analysis that will tell you if your ore is sulphide refractory (and the grain size you are needing to target for liberation), if you have pregnant solution robbers or if you have a more complex telluride or double ...
Removal of TCM from unoxidized, double refractory ores has been problematic due to significant gold losses in the TCM concentrate, which renders such removal impractical. Removing TCM from oxidized sulfide products can circumvent such gold losses and reduce the preg robbing behavior of the ores.
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Sep 28, 2016· Refractory ore trouble Russian gold miners. Nowhere is this problem of complex ore more prevalent than in Russia, where approximately 80% of gold reserves are refractory or partly so, according to figures from Petropavlovsk PLC. As competitive and cutthroat as the junior gold mining sector is, there is a line most miners would never cross when ...
carbonaceous refractory gold ore (double refractory). This was a very disappointing finding but useful in that large amounts of money were not spent drilling a problematic gold ore. A small scale gravity and flotation test programme was developed to produce a concentrate with the majority of the gold.
Thesis (Master, Mining Engineering) -- Queen's University, 2008-09-22 16:42:01.272
The initial results for the cyanide leach gold recoveries were very poor on a high-grade primary sulphide ore of 6.2 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 was developed to produce a concentrate with ...
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 was developed. The concentrate from the flotation procedure was processed using ...
Refractory ore processing methods almost always serve only one purpose, to treat ores… Continue Reading. microwave pretreatment of a double refractory gold ore. Microwave pretreatment of a double refractory gold ore | Mendeley Abstract. Double refractory gold ores, such as Barricks Goldstrike ore, contain both pyrite and carbonaceous matter ...