double refractory gold

refractory gold Archives International Mining

“Pressure oxidation was selected as the most feasible processing technology for double refractory ores. It is able to achieve gold recoveries of 96% by utilising high temperatures, elevated pressure and oxygen to recover encapsulated gold, while conventional cyanidation methods would result in suboptimal recovery rates of 2040%.

Technology options for processing complex and double ...

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 majority of the gold. This also failed with most of the gold remaining in the tailings.

DoubleRefractory Carbonaceous Sulfidic Gold Ores ...

Jan 01, 2016· 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.

GOLD IN ZIMBABWE SAIMM

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

ALTA MetBytes What's Happening in Gold Ore Processing

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

ALTA Gold 2012 EDoc Albion Process

Refractory gold ores are those that do not yield high gold recoveries in conventional cyanideleaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either through the presence of naturally occurring ‘preg robbing’ carbonaceous materials or gold physically ‘locked’ in sulphide minerals. ...

Technology To Enhance Gold Recovery For Double Refractory ...

Abstract Double refractory gold ores, such as Barrick’s 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 ...

(PDF) Pressure oxidation of double refractory gold ...

Nevertheless, the pressure oxidation of double refractory materials containing carbonaceous matter in addition to sulfides results in substantial gold losses due to autoclave pregrobbing.

Establishing thE ProcEss MinEralogy of gold orEs

A notable example of such a doublerefractory carbonaceous sulfide ore is at Barrick’s Goldstrike Mine where gold occurs in pyrite in refractory sulfide ore and doublerefractory sulfidic/ carbonaceous ore. These ores are pretreated by autoclave and roaster prior to cyanide leaching (Thomas et al., 2000; Wickens et al., 2003). In the Jinya

Gold mineral processing Hatch Ltd

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.

Processing Refractory Gold Hydrometallurgy: Leaching in ...

Processing Refractory Gold is so hard! Low recovery is very common with refractory ores, in fact a 70% recovery could be considered good. Refractory ores are normally have either a high sulfide content that masks the gold preventing cyanide leaching of the gold, or high organic content that also block gold leaching (reabsorbs the gold), or it ...

(PDF) Cyanidation of Refractory Gold Ores: A Review

double refractory gold or es", Minerals . Engineering, Vol. 18, ... Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide leaching circuits, even when the ...

Transformation of the carbonaceous matter in double ...

Sulfides and carbonaceous matter in double refractory gold ore (DRGO) were biotreated sequentially using an ironoxidizing archaeon Acidianus brierleyi followed by lignin peroxidasedominating crude enzymes released from the whiterot fungus Phanerochaete chrysosporium to significantly improve gold recovery from 24% to 92%.

Extraction of Gold from a LowGrade Double Refractory Gold ...

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 ...

Chapter 49. PregRobbing Gold Ores; Chapter 50. DoubleRefractory Carbonaceous Sulfidic Gold Ores; Chapter 51. Treatment of GoldTelluride Ores; Chapter 52. Treatment of Antimonial Gold Ores; Other GoldBearing Materials; Chapter 53. Gold A Key Enabler of a Circular Economy: Recycling of Waste Electric and Electronic Equipment

MICROBIAL PRETREATMENT OF DOUBLE REFRACTORY …

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

Gold processing 101 Mining Magazine

In the case of Goldstrike, this was a doublerefractory ore combining sulphideoccluded gold with pregrobbing carbonaceous material that rendered the ore unsuitable for conventional cyanide leaching and carbon adsorption.

v117n8a4 Evaluation of ozonation technology for gold ...

gold recovery and cyanide management during processing of a double refractory gold ore by V. Bazhko* and V. Yahorava* %47(060 The depletion of conventional gold resources around the world has resulted in mining companies and research institutions exploring the recovery of gold from refractory and double refractory ores. However,

REFRACTORY GOLD PanTerra Gold Limited

Highly refractory gold mineralisation – including double refractory ores, gold associated with both sulphide and carbonaceous mineralogy. Low to middletier resources that target a gold production of less than 150,000 oz per annum.

Gold's new golden moment FL

A need for technologies to treat smaller deposits Industry data show that the amount of gold contained in refractory measured and indicated (MI) resources is approximately double the amount of contained gold in economically viable refractory gold reserves.

WO2009037596A2 Method to improve recovery of gold from ...

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.

Polymetal to expand pressure oxidation gold treatment in ...

“Pressure oxidation was selected as the most feasible processing technology for double refractory ores. It is able to achieve gold recoveries of 96% by utilising high temperatures, elevated pressure and oxygen to recover encapsulated gold, while conventional cyanidation methods would result in suboptimal recovery rates of 2040%.

Refractory Gold | Mining | SGS

The other parameter that SGS experts consider when designing refractory gold treatments is whether or not to preconcentrate the goldbearing ore. This is usually done by flotation of arsenopyrite, pyrite, or other goldbearing sulfides. To be economically justifiable, preconcentration should meet …

Transformation of the carbonaceous matter in double ...

Sep 01, 2019· Sulfides and carbonaceous matter in double refractory gold ore (DRGO) were biotreated sequentially using an ironoxidizing archaeon Acidianus brierleyi followed by lignin peroxidasedominating crude enzymes released from the whiterot fungus Phanerochaete chrysosporium to significantly improve gold recovery from 24% to 92%. Transformation of the carbonaceous matter in …

US8262768B2 Method to improve recovery of gold from ...

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

Barrick Gold Corporation Processing Innovation Nets ...

Meanwhile, the mine's autoclave circuit had significant excess capacity, and was at risk of shutting down. The challenge was to develop a process that would treat double refractory ore using the autoclave circuit, therefore unlocking the value of the stockpiles. In 2009, the site began testing the thiosulfate process in a laboratory setting.

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