double refractory gold ores

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Gold Ore Processing: Volume 15: Project Development and Operations ...

Double-Refractory Carbonaceous Sulfidic Gold Ores 51. Treatment of Gold-Telluride Ores 52. Treatment of Antimonial Gold Ores Other Gold-Bearing Materials 53. Gold - A Key Enabler of a Circular Economy: Recycling of Waste Electric and Electronic Equipment Summary of Gold Plants and Processes, Emerging and Transformational Technologies 54.

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Simultaneous sulfide oxidation and gold dissolution by cyanide-free ...

Funding Information: The work was financially supported by Outotec (Finland) Oy. In addition, GoldTail (grant no. 319691), funded by the Academy of Finland, is gratefully acknowledged (ML). Special thanks go to John O'Callaghan for the discussions related to double refractory gold concentrate leaching. Ville Miettinen, Jari Tiihonen, and our colleagues and supervisors at Outotec Oy and Aalto ...

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Processing Refractory Gold - Hydrometallurgy: Leaching in Heap, Vat ...

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 ...

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Process for Recovering Gold and Silver From Refractory Ores

The present invention is directed to flotation of refractory and double refractory ores. In a first embodiment, a method includes the steps of: (a) providing a refractory gold-bearing sulfide ore. (b) comminuting the material to form a feed material with a primary size distribution; (c) floating the feed material to form first concentrate and ...

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Study on the Gold Recovery of Double Refractory Gold Ore Concentrate by ...

In this paper, Bacterial oxidation-cyanide leaching experiments were carried out and the carbonaceous substances composition of carbonaceous gold concentrate was been studied. The elemental composition was 9.73 % iron, 9.66 % sulfur, 4.84 % arsenic and 13.23 % carbon which element carbon and organic carbon was 12.11wt.% and 0.06 wt.% respectively.

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Flotation of Carbonaceous Matter from a Double Refractory Gold Ore: The ...

Aug 26, 2021The use of alkaline pressure oxidation to pretreat refractory gold ore often results in insufficient gold recovery (<60%) in downstream thiosulfate leaching. To improve gold recovery, flotation was considered for the separation of carbonaceous matter (C-matter). In this study, the effect of MIBC on C-matter flotation was investigated to understand the role of the frother in bubble and froth ...

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Bio-Oxidation of a Double Refractory Gold Ore and Investigation of Preg ...

the gold ore contains both sulfide minerals and CM, and it can be classified as a double refractory gold ore (DRGO), which is usually abandoned for economic reasons [5]. In such ores, the gold is encased in sulfides, which prevents direct contact between the leaching reagent and gold particles, thus interfering

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10.1016/j.mineng.2004.05.009 | DeepDyve

1 Introduction Refractoriness in gold ores may be caused by several factors including the presence of sulfides, tellurides, cyanicides and carbonaceous matter ( Boyle, 1979 ; Guay, 1981 ). When it is due to the presence of both sulfides and carbonaceous matter (CM), the ore is said to be double refractory ( Nyavor and Egiebor, 1992 ).

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A Case Study on the Limited Gold Recovery from Non-Ammoniacal ... - SSRN

The POX process followed by thiosulfate gold leaching is expected to deliver high gold recovery through gold liberation from sulfides and elimination of preg-robbing behavior of carbonaceous matter. However, the alkaline POX discharge from Goldstrike mine, Nevada, USA, still suffers from low gold recovery in thiosulfate leaching.

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Method to improve recovery of gold from double refractory gold ores

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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Near-Technical Limit Gold Recovery from a Double Refractory Carlin-Type ...

A recent Nevada Gold Mines research program focused on pressure oxidation pre-treatment of a Carlin-type double refractory ore from the Turquoise Ridge Mine. The research team found that both arsenian pyrite and carbonaceous matter were highly oxidized within an hour at 300 °C using a bench-top autoclave reactor and that the gold recovery from the residues after cyanide/carbon-in-leach ...

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Metals | Free Full-Text | Bio-Oxidation of a Double Refractory Gold Ore ...

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 A. ferrooxidans and L ...

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Double-Refractory Carbonaceous Sulfidic Gold Ores

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...

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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 preg-robbing due to the presence of organic carbon. These must be pretreated ahead of leaching.

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US8262768B2 - Method to improve recovery of gold from double refractory ...

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

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Mineralogy And Surface Chemistry - JS Mining Consulting

The ore investigated in this research, from Barrick's Cortez mine in Nevada, USA, is a notable example of this type of complex refractory ore which is described as double-refractory due to the presence of gold in a sulfide mineral matrix as well as in carbonaceous matter in the ore. Double-refractory ores give low recoveries of gold during ...

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Simultaneous sulfide oxidation and gold dissolution by cyanide-free ...

The double refractory gold concentrate was a typical refractory gold concentrate containing 38.7 g/t gold, 42.6 g/t silver, 22.5% iron, 6.1% arsenic, and 20.1% sulfur (Table 1) and consisted of 33.1% pyrite and 12.5% arsenopyrite, where chemically zoned arsenic-bearing pyrite carries 30.5% and arsenopyrite carries 69.5% of the total gold content...

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Gold Ore Roasting Techniques - Mineral Processing & Metallurgy

Those types of gold ores which most frequently require roasting include ores carrying arsenopyrite, stibnite, sulphotellurides, and pyrrhotite. Straight pyritic ores, where the pyrite is present in small quantities, usually yield their gold to fine grinding and cyanidation alone.

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Establishing thE ProcEss MinEralogy of gold orEs - sgs

A notable example of such a double-refractory carbonaceous sulfide ore is at Barrick's Goldstrike Mine where gold occurs in pyrite in refractory sulfide ore and double-refractory 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

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Gold's new golden moment -

The industry needs to discover more economically viable means of extracting gold from refractory, low-grade ores and thereby increase reserves. Since 2012, there have been less than ten major gold deposits discovered globally. ... (M&I) resources is approximately double the amount of contained gold in economically viable refractory gold ...

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Establishing thE ProcEss MinEralogy of gold orEs - SGS S.A. - FLIP HTML5

Description: 3 A notable example of such a double-refractory carbonaceous sulfide ore is at Barrick's Goldstrike Mine where gold occurs in pyrite in refractory sulfide. Read the Text Version. ... particles in can be identified from the "spikes" andminerals with high backscatter signals sulfides from refractory gold ores. Now, "bumps ...

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CIL Gold Loss Characterization within Oxidized Leach Tails: Creating a ...

A double refractory gold ore contains gold particles locked in sulphides, solid-solution in arsenopyrite, and preg-robbing material such as carbonaceous matter, and so on. The diagnostic leach test (DLT) and preg-robbing (PR) approaches are widely used to investigate the occurrence and the distribution of refractory gold.

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Gold Dissolution from Ore with Iodide-Oxidising Bacteria

Gold leaching from ore using iodide-iodine mixtures is an alternative to gold cyanidation. This study evaluated the ability of iodide-oxidising bacteria to solubilise gold from ore that was mainly...

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Pressure oxidation of double refractory gold concentrates

The reasons for gold-bearing materials refractory nature and behaviour features of carbonaceous matter during pressure oxidation of concentrates were discussed. The chemical processes that lead to...

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Improvement of gold recovery for double refractory gold ore with ...

Gold price chart Au Why Bio-hydrometallurgy？ Low grade ore can be explored Advantages in environment, energy, safety and cost Indispensable technology for SDGs Contributions to SDGs Abbreviations D → DRGO (Double refractory gold ore) A → bio-oxidation by A. brierleyi W → Washing with1 M HCl C → CFSM treatment (Cell Free Spent Medium

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Abstracts & Contents - About

THE OXIDIZED GOLD AND ITS ROLE IN PRESSURE OXIDATION OF DOUBLE REFRACTORY GOLD CONCENTRATES 194 ... Lev Chugaev, Yakov Shneerson, SRC Hydrometallurgy (Russia ) PRESSURE OXIDATION OF REFRACTORY GOLD ORES: THE METATES GOLD PROJECT EXPERIENCE 203 Gary Parkison, Chesapeake Gold Corp, (Canada); Art Ibrado, M3 Engineering and Technology (USA ...

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Recovery of gold from sulfide refractory gold ore: Oxidation roasting ...

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 A. ferrooxidans and L ...

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Mycohydrometallurgy: Biotransformation of double refractory gold ores ...

Double refractory gold ores (DRGO) contain organic carbonaceous matter (CM) and sulfide minerals, and thus require pretreatment before cyanidation for gold extraction.

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A two-stage bacterial pretreatment process for double refractory gold ores

For double refractory gold ores which contain sulfide minerals and organic carbonaceous matter, the stage in which to use coaldegrading microorganisms (Amankwah et al. 2005) for degradation of the ...

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Cyanidation of Refractory Gold Ores: A Review - ResearchGate

Directions for future research in processing refractory gold ores has been stated. ... double refractory gold or es", Minerals . Engineering, Vol. 18, pp. 103-108.

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Simultaneous Biotransformation of Carbonaceous Matter and Sulfides in ...

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 ...

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Refractory gold ores: Challenges and opportunities for a key source of ...

Mar 23, 2021Gold miners are facing a reserves crisis, and what is left in the ground is becoming more and more challenging to process.Refractory gold reserves, which require more sophisticated treatment methods in order to achieve oxide-ore recovery rates, correspond to 24 percent of current gold reserves and 22 percent of gold resources worldwide (Exhibit 1).

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

The first report in this recurring series on microbial processes in the minerals industries was published in 2003 (Olson et al. 2003), followed by an update after 10 years (Brierley and Brierley 2013) with bioleaching and biooxidation of sulfide minerals, primarily copper (in the case of bioleaching) and refractory gold ores (biooxidation) matured to represent significant production of those ...

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Biotechnological Approaches to Facilitate Gold Recovery from Double ...

Downloadable! Double refractory gold ore (DRGO) not only include ppt levels of gold grains locked in sulfide minerals but also a problematic amount of carbonaceous matter. This causes a significant recovery loss of gold during cyanidation because of the strong affinity of the Au(CN)2- with the carbonaceous matter. Combustion decreases the carbonaceous matter content, but also emits pollutant ...

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Flotation of Carbonaceous Matter from a Double Refractory Gold Ore: The ...

The use of alkaline pressure oxidation to pretreat refractory gold ore often results in insufficient gold recovery (<60%) in downstream thiosulfate leaching. To improve gold recovery, flotation was considered for the separation of carbonaceous matter (C-matter). In this study, the effect of MIBC on C-matter flotation was investigated to understand the role of the frother in bubble and froth ...

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Significance of Acid Washing after Biooxidation of Sulfides in ...

Environmentally friendly pretreatment of double refractory gold ores (DRGO) to improve gold recovery without emitting pollutant gas is challenging. Sequential biotreatment, including iron-oxidizing microorganisms to decompose sulfides, followed by

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eTD Explore - Pennsylvania State University

double refractory gold ores Phanerochaete chrysosporium. File: Download Grace.Dissertation.Final.07.15.10.b.pdf Committee Members: Kwadwo Osseo Asare, Dissertation Advisor/Co-Advisor Kwadwo Osseo Asare, Committee Chair/Co-Chair Yaw Yeboah, Committee Member Ming Tien, Committee Chair/Co-Chair

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A two-stage bacterial pretreatment process for double refractory gold ores

A two-stage bacterial pretreatment process for double refractory gold ores @article{Amankwah2005ATB, title={A two-stage bacterial pretreatment process for double refractory gold ores}, author={Richard Kwasi Amankwah and Wan Tai Yen and Juliana Akit Ramsay}, journal={Minerals Engineering}, year={2005}, volume={18}, pages={103-108} } R. Amankwah ...

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Method to Improve Recovery of Gold From Double Refractory Gold Ores ...

The invention is directed generally to treatment of refractory and double refractory precious metal materials by oxidizing a portion of the sulfide sulfur followed by selective flotation to separate the carbonaceous material from precious metal sulfides.

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CA2705487A1 - Microbial pre-treatment of double refractory gold ores ...

The present invention is directed to recovery of gold from refractory and double refractory ores using a fungal agent and/or culture media.

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