Processing of refractory gold ores

The column bio-oxidation process of refractory gold ore was characterized by a variety of analytical methods, including X-ray diffraction, 16S rRNA gene analysis, scanning electron microscope coupled with energy-dispersive X-ray spectroscopy and 3D confocal laser scanning microscopy. The evolution of the microbial community structure …

Bioprocessing of Refractory Gold Ores: The BIOX, …

In July 2020, Outotec launched MesoTHERM as a process option for refractory gold extraction. Fig. 4.4. MesoTHERM BIOX flowsheet for refractory gold. Full size image. 4.4 ASTER Process. ... Proceedings of the ALTA 2011 Nickel-Cobalt-Copper, Uranium and Gold Conference, Perth 23–28 May 2011. Google Scholar van Hille RP …

Pretreatment of refractory gold ore by curing with …

The experimental results showed that under the conditions of liquid solid ratio 3:1, curing temperature 240 °C and the reaction time 1.5 h, the weight loss rate and …

Overview of the Challenges and Opportunities in Processing Complex Gold

The key aspects which make cyanide widely used in the mining industry for gold extraction include low cost, process simplicity, adaptability, low redox potential, ... Aylmore MG (2001) Treatment of a refractory gold-copper sulfide concentrate by copper ammoniacal thiosulfate leaching. Miner Eng 14(6):615–637.

A systematic review of gold extraction: Fundamentals, …

They perform more satisfactorily in treating copper-gold or refractory sulfide ores than cyanidation. Currently, the thiosulfate gold leaching operation at the Goldstrike mine, Nevada, of Barrick Gold Corp is the only large-scale gold extraction plant with an alternate lixiviant (Azizitorghabeh et al., 2021). Although research on sulfur ...

A systematic review of sustainable gold extraction from raw …

The main objective here is to discuss how the gold extraction process can be more sustainable, with a view to developing more greener leaching reagents. ... Optimisation of gold recovery by selective gold flotation for copper-gold-pyrite ores. Miner. Eng. (2001) ... Accelerating gold extraction from refractory gold tailings via NH 4 HF 2 …

Treatment of refractory gold: more sustainable …

Outotec, a frontrunner in minerals and metals processing, has recently launched the Outotec MesoTHERM BIOX ® process for the treatment of refractory gold. This innovative solution …

Gold Extraction & Recovery Processes

Process Development Considering the different gold minerals present alone or combined with the host rock, it will be necessary to discharge the unwanted material in order to increase the concentration of gold in an economically manner. This part treats the strategy of beneficiation as a combination of several processes. Joining …

A clean and efficient innovative technology for refractory sulfide gold

More research is needed to investigate the process mechanism and gold extraction effect of refractory sulfide gold ore generating thiosulfate to obtain a satisfactory gold recovery on an industrial scale. If so, this novel technology with less environmental impact and lower cost will be introduced to the non-cyanide green gold …

Refractory gold reserves: Challenges and opportunities for a …

Recently, copper-citrate-thiosulfate leaching was tested on refractory gold ore, exhibiting a similar extraction capability for gold, in which the predominant gold …

Copper interaction during the dissolution of gold

The proposed leaching approach significantly reduces the cyanide consumption by at least 75% and most of the copper is present as cupric glycinate in the final leach solution. In addition, gold, silver and copper extraction was higher than the conventional cyanidation process utilising similar cyanide dosages for all the gold …

(PDF) Copper and Gold Production from a Refractory Cu-Au …

This example analyzes a bio-hydrometallurgical process for the extraction, purification and recovery of copper and gold from a refractory concentrate. The process features preparation and ...

Scaleup of pressure oxidation processes | Mining, …

The successful commercialization of a pressure oxidation (POX) process for recovering metal values, including gold, copper, zinc, nickel and molybdenum, is the result of a carefully planned development program. The initial task involves developing one or more conceptual flowsheets, including the POX autoclave and downstream purification …

Effects of pyrite, quartz and sodium sulfite on roasting of a

When multi-metal sulfur-containing refractory gold ore is the subject of investigation, an oxidation-roasting pretreatment is applied to remove part of the sulfur and subsequent acid leaching of copper and cyanide leaching of gold. Under this process, both copper and sulfur can be recovered, and gold extraction can be improved (Fraser …

Selection on the Process of Enriching Gold by Smelting from Refractory …

The metallurgy-beneficiation united process has advantages of high gold recovery ratio, environment-friendly and low cost, which provides a new idea for the extraction of gold from refractory gold ...

Overview of the Challenges and Opportunities in Processing …

The study indicates that the major challenges in processing complex gold-copper ores through the conventional cyanidation method include (1) increase in …

Ammoniacal thiosulfate leaching of refractory oxide gold ore

Cyanide leaching test was performed to determine the leachable portion or the refractory nature of the ore. The result showed that 74% of gold could be readily leached by cyanidation. Therefore, it was concluded that the ore is refractory because the gold extraction by cyanidation process is < 80% (Marsden and House, 2009). 3.2.

Progress in bioleaching: part B: applications of microbial processes by

One biooxidation–heap process for pretreatment of sulfidic-refractory gold ores was also commercialized. ... Enargite- and covellite-rich composites had low copper extraction ranging from 7.3 to 27.1 % based on column head (feed ore)/residue (leached ore) assays from columns after more than 300 days of bioleaching at room temperature …

Extraction of Gold from Refractory Gold-Bearing Ores by …

Problems related to the effective processing of refractory gold ores containing carbon and arsenic are discussed. In the search for technologies for the extraction of gold from such ores, including those obtained from the Sayak-4 gold deposit, pyrometallurgical processing represents a possible direction. The results of an …

(PDF) Electro-Hydrometallurgical Chloride Process For Selective Gold

In addition, gold concentration of 1 mg/L in the PLS was established as the minimum concentration required for efficient operation of the EDRR process. Gold extraction from ore to solution ...

Environmentally friendly extraction of gold from refractory …

Copper – ethylenediamine – thiosulfate leaching is described as an alternative green way of gold extraction. •. Under optimal conditions, a gold extraction …

Optimization Process of the Refractory Gold Ore Extraction …

The purpose of this study was to investigate the optimum condition for the leaching process of refractory gold ore with the change in the concentration of …

Copper–gold ore processing with ion exchange and SART …

The successful operation of Anglo Asian Mining's Gedabek process plant, which uses a unique combination of ion exchange for gold extraction and SART technology for copper control, has demonstrated a new route for the treatment of copper–gold ores, which in the past have proved difficult to handle with conventional …

Bio-Oxidation and Biocyanidation of Refractory Mineral Ores for Gold

The removal of elemental sulfur in this process will clean the mineral surfaces for subsequent oxidation, prevent interference with the gold extraction process and reduce consumption of chemicals ...

Electro-hydrometallurgical chloride process for selective gold …

Furthermore, process simulation model was built, and it suggested that closed-loop operation of cupric chloride leaching – EDRR recovery – copper precipitation process can recover in total over 84% of gold from refractory telluride ore to the cathode product, providing further evidence of true potential of EDRR in sustainable gold …

Refractory gold ores and concentrates part 1: mineralogical …

A comprehensive mineralogical and physico-chemical examination of two refractory gold ores and concentrates from the Ghanaian gold province was conducted …

Review A systematic review of gold extraction: …

However, with the increasing refractory nature of gold ores and restrictions on cyanidation, interest in halide-based gold leaching processes was renewed in the 1990s (Tran et al., 2001). The. Microbial leaching. Currently, approximately 5 % of global gold production is from biomining (Yarlagadda et al., 2016).

The BIOX™ Process for the Treatment of Refractory Gold Concentrates

Improved extraction techniques for these refractory gold-bearing concentrates (Figure 7) consist of oxidative pre-treatments including low-alkalinity high-pressure cyanidation (Davis et al., 1986 ...

(PDF) INVESTIGATION OF THE AMENABILITY OF A COPPER-RICH REFRACTORY GOLD

In this study, the amenability of a copper-rich gold ore (108 g/t Au, 1.60% Cu) to cyanide leaching was investigated. Direct cyanide leaching of the ore showed that the gold extraction was very ...

Simultaneous extraction of gold and zinc from refractory …

A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using NaCl as chlorination agent.

Gold Extraction from a High Carbon Low-Grade Refractory Gold …

A high carbon low-grade gold ore, in which gold mainly occurs in carbonaceous matters, is a typical refractory gold ore whose conventional cyanide leaching extraction is only 12.9 %.

Recent challenges in biological cyanidation and oxidation of …

Refractory gold mining often involves complex extraction processes, such as pressure oxidation or bioleaching, which can release harmful chemicals and pollutants into the environment. This can lead to water and soil contamination, impacting local ecosystems and communities (Bouffard and Dixon 2004 ; Asamoah 2021 ).