Abstract Double refractory gold ores, such as Barricks Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an ...
The efficiency of biooxidation for treatment of a double-refractory gold-bearing sulfide ore concentrate from the Bakyrchik deposit East Kazakhstan was defined. The experiments were conducted in two different modes, i.e., with the standard liquid medium and the medium imitating the chemical composition of the Bakyrchik deposit groundwater and containing high concentrations of sodium ...
R. Badri and P. Zamankhan, Sulphidic refractory gold ore pre-treatment by selective and bulk flotation methods, Advanced Powder Technology, 24 2 2013, 512519. CrossRef Google Scholar
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.
Nov 01, 2016 The term double refractory is applied when refractoriness of the gold ore is exacerbated by the presence of preg-robbing carbonaceous material. The problem of double refractory ores is not well understood. It is a current topic of investigation by a few mining companies and research groups in terms of processing.
Double refractory ores present a unique challenge to the traditional method of gold recovery in mining. Double refractory ores are ores that contain sulfides and carbons, as opposed to single refractory ores which contain only sulfides. In general, the cyanide solution pulls the gold out of the ore and into solution.
Our experienced team of metallurgical professionals has developed bankable flowsheets for thousands of projects. These flowsheets are confirmed by bench and pilot-scale testing programs that are internationally recognized by the mining, engineering and financial communities. SGS is the industry leader in refractory gold characterization.
The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy XRF, X-ray diffraction spectroscopy XRD, and scanning electron microscope SEM. The results showed that gold was highly dispersed in gold-bearing minerals such as pyrite, arsenopyrite, and some gangues in the form of natural gold and electrum.
Nov 28, 2016 The reason of the gold mineral refractory There are so many types of reasons that caused the difficulty of gold ore processing, including physical element, chemical element, and mineralogical element.
The term refractory has become a name that is commonly applied to ores that are more challenging to treat economically. Typically referring to gold deposits. Any ore can be treated by methods that will generate high recovery, but the part that we are all challenged by is achieving this with a positive economic outcome.
May 18, 2021 The partners have added 800,000 gold ounces to Calibre gold deposits inferred mineral, part of their Citadel copper-gold project. Rio, Antipa more than double JV deposit gold resource - MINING.COM
Aug 18, 2020 The alkaline hot-pressure oxidation is only suitable for refractory gold deposits with high carbonate content and low sulfide content 20. The acidic hot-pressure oxidation means that the pyrite, arsenopyrite and other sulfides react with the oxygen in an acidic medium under the high temperature and high pressure.
Jul 14, 2016 Cyanidation and concentration of gold and silver ores. List Gold Refractory Process Methods. The use of roasting for the oxidation of sulfides has declined over the years. However. Resolute Mining resurrected the Syama project in Mali by converting the process from a whole-ore roast to flotation followed by concentrate roasting.
Mar 23, 2021 McKinseyWebsiteAccessibilitymckinsey.com. Thus, according to MineSpans data, 54 percent of gold production from refractory deposits comes from mines situated in the bottom half of the cost curve, while only 18 percent sits in the fourth quartile Exhibit 5. This high-grade effect is expected to remain in place at least until 2023, but grade ...
While not all new discoveries are refractory, this indicates that it is becoming increasingly harder to find economically viable large gold deposits. A need for technologies to treat smaller deposits Industry data show that the amount of gold contained in refractory measured and indicated MampI resources is approximately double the amount of ...
implemented by Barrick to treat double refractory gold ore following pressure oxidation at its Goldstrike Mine in Nevada, USA. The CSIRO reagent system is an alternative to cyanide and has particular application where cyanide cannot be used and to unlock stranded high-grade deposits.
The initial results for the cyanide leach gold recoveries were very poor on a high-grade primary sulphide ore of 6.2 gt 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 ...
for adequate gold recovery to be achieved through traditional cyanidation and carbon adsorption processes. Pyrite and arsenopyrite are the most common host minerals in refractory gold deposits. Recent introduction of hydrometallurgi-cal pre-treatment processes, such as pressure oxidation and bacterial leaching bio-oxidation, has given mining
A6. Graph calculating volume of source rock required to form gold deposits containing various amounts of gold A15 A7. Eh-pH diagram for Au-Cl-H2O system at 25 C and aqueous chloride concentration of 20 ppm A16 A8. Oxygen activity-pH diagram for the system Au-NaCl-S-H2O relative solubilities of gold chloride and bisulfide complexes A17 ...
Jun 20, 2019 For example Chesapeake Minerals Metates project in Mexico is considered one of the largest gold-silver-zinc reserves in the world, at 18.5 million ounces of proven and probable gold. But the ore is double refractory, meaning the gold is locked within the pyrite and contains a lot of carbon.
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Sep 23, 2020 In terms of companies, Barrick Golds majority-owned Nevada Gold Mines is the single largest gold-mining complex in the world, producing about 3.5 million ounces a year.
double-refractory sulfidecarbonaceous ore, gold ores are pretreated by autoclave and roaster prior to cyanide leaching.4.5 In the JInya Carlin-type gold deposit in China, gold occurs mainly as submicroscopic gold in arsenopyrite and pyrite and is recovered by roasting a flotation concentrate followed by cyanidation.6
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 ...