double refractory gold

Metallurgical Process Difficulties Developing Flowsheets ...

The 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).

SIMULTANEOUS BIOTRANSFORMATION OF …

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

Barrick Thiosulfate Leaching of Double Refractory Ore

recover gold from double refractory ores instead of single refractory ores, gold has a strong affinity for the carbon in the ore slurry along with the activated carbon used to capture the gold in solution and thus, can be lost through the tails. This phenomena is called preg-robbing.

Carfilzomib in multiple myeloma: gold, silver, or bronze ...

Is carfilzomib deserving of gold, silver, or bronze? It may not be possible to judge right now, as the therapy of myeloma is evolving quickly. ... Patients with double refractory disease are the immediate beneficiaries, but the door has been opened for future endeavors involving more rapid dose escalation, use of higher doses, use in ...

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

Sep 11, 2012· 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.

Microwave pretreatment of a double refractory gold ore ...

Sep 01, 2007· Microwave pretreatment of a double refractory gold ore Microwave pretreatment of a double refractory gold ore Nanthakumar, B.; Pickles, C.A.; Kelebek, S. 2007-09-01 00:00:00 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.

Double Refraction - The Gemology Project

If the light enters at an oblique angle, each vibration changes direction and travels along paths that differ from the original path AND differ from each other. This is double refraction caused by the birefringence. If the light enters normal to the prism face, each vibration travels at …

Microwave pretreatment of a double refractory gold ore ...

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.

microwave pretreatment of a double refractory gold ore

refractory gold pretreatment Microwave pretreatment of a double refractory gold ore 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.

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.

Chemical Innovations: Barrick Goldstrike has a new way to ...

Barrick Gold Corp.'s Goldstrike Mine is following in this ... As mining continued through the years, the ores in the pits at Goldstrike changed to mostly double refractory ores. Since the ...

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 submicroscopic gold (invisible gold) finely disseminated within a sulfide-rich matrix within carbonaceous material.

METHOD TO IMPROVE RECOVERY OF GOLD FROM DOUBLE REFRACTORY ...

Mar 19, 2009· 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.

US20090158893A1 - Microbial pre-treatment of double ...

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.

Barrick Thiosulfate Leaching of Double Refractory Ore

Barrick has partnered with the University of Nevada, Reno's Chemical and Materials Engineering Department in order to examine the thiosulfate leaching process. Barrick requests the Leaching Team to optimize the thiosulfate leaching process for double refractory ores.

Technology to enhance gold recovery for double refractory ...

A new technology to improve gold recovery in the processing of double refractory ores, which often resulted in native carbon competing with activated carbon and limiting gold recovery – commonly ...

Biooxidation of a double-refractory gold-bearing sulfide ...

Sep 22, 2015· The efficiency of biooxidation for treatment of a double-refractory gold-bearing sulfide ore concentrate from the Bakyrchik deposit (East Kazakhstan) was …

Processing double refractory gold-arsenic ... - DeepDyve

Nov 01, 2016· Read "Processing double refractory gold-arsenic-bearing concentrates by direct reductive melting, Minerals Engineering" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

PROCESSES OF GOLD RECOVERY - blogspot.com

PROCESSES OF GOLD RECOVERY ... One major category of refractory ores are gold values contained within the crystalline structure of sulfide minerals such as pyrite and arsenopyrite. For cyanide to leach gold, the cyanide solution must come into direct contact with gold molecules. With many sulfide ores, the ore cannot practically be ground down ...

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,

How to profit from low-grade gold mines – MINING.COM

Dec 23, 2018· But the ore is double refractory, meaning the gold is locked within the pyrite and contains a lot of carbon. Breaking the gold free requires both physical (ultra-fine …

Processing Refractory Gold - Hydrometallurgy: Leaching in ...

May be increasing gold recovery from refractory gold ore (with grade 2-3 g/t) to 90-95%?Actual data of top refractory gold ore mines show, that gold recovery is 70% and less. What is reason? It is a problem in minerals processing or it is a global science problem? So if you work with refractory ore,

Pressure oxidation of double refractory gold concentrates

PDF | 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 ...

MICROBIAL PRE-TREATMENT 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 pre-treatment of double refractory gold ore (sample A) and

ALTA Gold 2012 E-Doc - albionprocess.com

Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide-leaching 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. ...

US8262768B2 - 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.

Gold Ore Processing, Volume 15 - 2nd Edition - Elsevier

Gold Ore Processing, Volume 15 2nd Edition Project Development and Operations Editors: ... Double-Refractory Carbonaceous Sulfidic Gold Ores 1. Introduction; 2. Processing Alternatives ... and treatment of challenging ores such as double refractory carbonaceous sulfides. Outlining best practices in gold processing from a variety of perspectives ...

Home Page - AuTec Innovative Extractive Solutions Ltd

He worked in a Cu-Pb-Zn mine for optimizing grinding and flotation performance. He has managed numerous laboratory & piloting projects for double refractory gold and copper-gold ores in areas of flotation, gravity, HPGR, ultra-fine grinding, conventional & surfactant assisted cyanide leaching, thiosulfate leaching and autoclave pressure oxidation.

Refractory Gold Ore Treatment Methods

Metallurgical ContentGold Leaching & Processing of Arsenic OreMispickel (Arsenopyrite: FeAsS).6Leaching and Recovering Gold from Antimony MineralsStibnite (Antimony Sulphide, Sb2S2)Telluride Gold Ore ProcessingSolubility of TelluridesGold Extraction from Carbonaceous OreList Gold Refractory Process Methods Where gold is associated with arsenic, antimony, tellurium, and …

Extraction of Gold from a Low-Grade Double Refractory Gold ...

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...

A Breakthrough For Chinese And Russian Gold Miners ...

A Breakthrough For Chinese And Russian Gold Miners? ... Double Refractory Ore. ... Both the gold encapsulation and the carbon make recovery of the gold extremely difficult (double-refractory).

Sequential pretreatment of double refractory gold ore ...

Request PDF on ResearchGate | On Jul 1, 2019, Kojo T. Konadu and others published Sequential pretreatment of double refractory gold ore (DRGO) with a thermophilic iron oxidizing archeaon and ...