Carbonaceous Gold Ores Treatment Process Hydrometallurgy

It is good with fine gold in sulphides. Pyrite may not need to oxidize completely in this process. It works well with telluride gold ores such as at Certej in Romania. General mineralogy affects the process choice (sulfide content, carbonate content and composition, organic matter and so forth) as well as economics, infrastructure, climate

get price

Carbonaceous Gold Ore Treatment Method

The simplest method of treating a carbonaceous ore is the method described by R. W. Nice (1971) at the McIntyre Porcupine Mine where the carbon, which contains very little gold, is floated off and discarded. The remaining ore is then responsive to cyanidation. This does not work at Carlin because the carbonaceous compounds have a high gold content.

get price

Treatment of carbonaceous refractory gold ores ScienceDirect

Jan 01, 1991The deleterious effect of carbonaceous matter in gold ores on cyanidation has been recognized by the mining industry for many years. Prominent among the U.S.A. carbonaceous refractory gold deposits are those of Carlin Mines, Gold Quarry and Maggie Creek (in the Carlin Trend, Nevada), and Gold Acres and Getchell Mine (in the Cortez Trend, Nevada

get price
Cited by: 73

PREG-ROBBING CARBONACEOUS MATTER: AN EVALUATION

Gold losses related to carbonaceous matter (CM) during processing are a significant problem in the gold processing industry. Inherent CM in gold ores can behave similarly to activated carbon in its ability to adsorb gold cyanide. This phenomenon is termed preg-robbing as the surface adsorbed gold cannot, for the most part, be recovered.

get price

Research status of carbonaceous matter in carbonaceous

Nov 01, 2013In the carbon-in-leach process, activated carbon is used to Hong-ying YANG, et al/Trans. Nonferrous Met. Soc. China 23(2013) 3405 3411 3408 compete with carbonaceous matter for gold extraction, but it has less effect on highly preg-robbing ores with high concentration of micro-fine particle carbon [4,17].

get price
Cited by: 29

Double-Refractory Carbonaceous Sulfidic Gold Ores

Jan 01, 2016The presence of carbonaceous matter in the ore has also been identified as a cause for the refractory behavior of some gold ores. Like activated carbon, the carbonaceous matter can adsorb the gold cyanide complex, thus reducing the recovery of gold in a cyanide-based process.

get price

STUDY ON SURFACTANTS FOR PASSIVATION OF NATURALLY

chemical compounds can passivate the carbonaceous matter by selective adsorption or wetting of its surface. Treatments of carbonaceous ores with chemical surfactants (blanking reagents) have shown promising results but at the same time have demonstrated that, if not properly used, could have a strong detrimental effect on the gold recovery process.

get price

Preg-robbing gold ores Request PDF

The carbonaceous matter present in an ore can adsorb dissolved gold in the conventional cyanide leaching process and this phenomenon is known as preg-robbing.

get price

Preg-robbing gold ores ScienceDirect

Jan 01, 2005Carbonaceous matter in a gold ore has been shown to act like activated carbon and adsorb solubilized gold from cyanide solution during leaching. It is thought that the dispersion of the carbonaceous matter and its fineness (less than 20 μm) account for the high adsorption and loss of gold during cyanidation ( Sibrell and Miller, 1991 ; Pyke et

get price

An investigation of the carbonaceous component of preg

processing. The ability of carbonaceous material to adsorb gold (I) cyanide from solution is widely acknowledged and documented2,7,8,12-14. Early characterization studies by Radtke and Scheiner15 into the physical and chemical nature of carbonaceous gold ores identified two distinct organic components in addition to an activated carbon type

get price

Preg-robbing gold ores Request PDF

The carbonaceous matter present in an ore can adsorb dissolved gold in the conventional cyanide leaching process and this phenomenon is known as preg-robbing.

get price

The behaviour of carbonaceous matter in cyanide leaching

Carbonaceous gold ore is a kind of refractory gold ore resource, the processing of which is impacted by "preg-robbing" behavior and the inhibition of Au dissolution by carbonaceous matter [4,[8][9

get price

The behaviour of carbonaceous matter in cyanide leaching

The dissolution of gold foils artificially coated with the natural carbonaceous matter extracted from Stawell ore was also substantially retarded. In comparison, graphite had a much lower coating ability on gold. The addition of free carbonaceous matter to pre-ground non-carbonaceous sulphide gold ores did not have much effect on gold cyanidation.

get price

Adsorption of aurocyanide complexes onto carbonaceous

solutions during the processing of carbonaceous ores. During processing of Goldstrike ore, cyanide ions complex elemental gold to form aqueous Au CNŽ.y 2 complexes. A carbon-in-leach CIL circuit removesŽ. the gold–cyanide complex from the aqueous solution by adsorption onto coarse-grained commercial acti-vated carbon.

get price

Gold Ore Roasting Plant Mineral ProcessingMetallurgy

The gold contained in the ore occurs at an average of. 17 opt (ounces per ton of ore). The gold is within the sulfide mineral matrix, which is not exposed (and therefore can not be dissolved by) a cyanide leach solution. Also the ore contains carbonaceous matter which absorbs gold in the conventional leaching process.

get price

MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY GOLD

process recorded the best gold extraction of 81.5% for sample A. S. Setonii degraded carbonaceous matter unlike T. versicolor which passivated it. However, it takes only 3 7 days for T. versicolor to effect passivation and eliminate preg-robbing while 14 56 days is required for S. setonii to degrade carbonaceous matter significantly.

get price

STUDIES IN THE PROCESSING OF A CARBONACEOUS GOLD

PART III: THE IMPLICATIONS OF PROCESSING PRESTEA CARBONACEOUS GOLD ORE. General Introduction CHAPTER 6 FLOTATION OF GOLD AND GRAPHITE AND PRESTEA CARBONACEOUS GOLD ORE 6.1 Introduction 220 6.2 Experimental 225 6.2.1 Materials 225 6.2.2 Flotation of gold and synthetic graphite 225 6.2.3 Flotation of Prestea carbonaceous matter 228

get price

Gold Processing,Extraction,Smelting Plant Design

Gold ore . Prominer maintains a team of senior gold processing engineers with expertise and global experience. These gold professionals are specifically in gold processing through various beneficiation technologies, for gold ore of different characteristics, such as flotation, cyanide leaching, gravity separation, etc., to achieve the processing plant of optimal and cost-efficient process designs.

get price

Gold extraction Wikipedia

Gold extraction refers to the processes required to extract gold from its ores.This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore.. Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing, resulting in direct recovery of

get price

(PDF) Preg-robbing Characteristics of Gold Ores in Ghana

Refractory carbonaceous gold ores pose challenges during cyanidation of gold due to the presence of carbonaceous matter (CM) which preg-robs dissolved gold, and this results in a decreased recovery.

get price

Processing Refractory Carbonaceous Ores for Gold Recovery

Dec 28, 2015Carbonaceous gold-bearing ores of the type that occur in north central and northeastern Nevada were investigated by the Bureau of Mines as part of its Heavy Metals Program. Specific objectives were to identify the carbon and organic compounds that prevent adequate gold recovery from the ore by cyanidation, and to develop an economical process that would overcome the detrimental

get price

Bioleaching Carbonaceous Gold Ores

As an alternative, CIL cyanidation of the carbonaceous gold ores also improved gold recovery to either a greater or lesser extent than the blanking agent pretreatment, depending on the ore (Table 5). In general, bioleaching the carbonaceous ores produced residues which yielded better gold recoveries than either CIL or blanking agent pretreatment.

get price

Bio-modification of carbonaceous matter in gold ores

Carbonaceous matter in refractory gold ore is known to be one of the primary causes of gold recovery loss. Model experiments were conducted to simulate the bio-modification of carbonaceous matter using powdered activated carbon (PAC) as a surrogate and cell

get price

Pyrometallurgical opening of refractory carbonaceous and

Carbonaceous and arsenic, highly refractory gold ledge ores are the minerals with complex composition and structure. High recovery of noble metals from them is an unsolved problem of the gold mining industry of the world. Our stone detaily reviews the phase compositions, structure and thermal properties of the source gold refractory ores using physical methods that allowed determining

get price

The behaviour of carbonaceous matter in cyanide leaching

Carbonaceous gold ore is a kind of refractory gold ore resource, the processing of which is impacted by "preg-robbing" behavior and the inhibition of Au dissolution by carbonaceous matter [4,[8][9

get price

Bio-modification of carbonaceous matter in gold ores

Carbonaceous matter in refractory gold ore is known to be one of the primary causes of gold recovery loss. Model experiments were conducted to simulate the bio-modification of carbonaceous matter using powdered activated carbon (PAC) as a surrogate and cell

get price

Transformation of the carbonaceous matter in double

Sulfides and carbonaceous matter in double refractory gold ore (DRGO) were bio-treated sequentially using an iron-oxidizing archaeon Acidianus brierleyi followed by lignin peroxidase-dominating crude enzymes released from the white-rot fungus Phanerochaete chrysosporium to significantly improve gold recovery from 24% to 92%.

get price

Enzymatic Pre-Treatment of Carbonaceous Matter in Preg

The bio-treatment of double refractory gold ores (DRGO) to reduce preg-robbing needs to account for the heterogeneity of the ore so as to acquire a much more complete picture of the system. To this end, the effects of ferrous ion additives on the degradation of powdered activated carbon (PAC) by cell-free spent medium (CFSM) was studied. Au(CN)2- adsorption and Raman spectrometric results

get price

Processing Refractory Carbonaceous Ores for Gold Recovery

Dec 28, 2015Carbonaceous gold-bearing ores of the type that occur in north central and northeastern Nevada were investigated by the Bureau of Mines as part of its Heavy Metals Program. Specific objectives were to identify the carbon and organic compounds that prevent adequate gold recovery from the ore by cyanidation, and to develop an economical process that would overcome the detrimental

get price

(PDF) Preg-robbing Characteristics of Gold Ores in Ghana

Refractory carbonaceous gold ores pose challenges during cyanidation of gold due to the presence of carbonaceous matter (CM) which preg-robs dissolved gold, and this results in a decreased recovery.

get price

Pyrometallurgical opening of refractory carbonaceous and

Carbonaceous and arsenic, highly refractory gold ledge ores are the minerals with complex composition and structure. High recovery of noble metals from them is an unsolved problem of the gold mining industry of the world. Our stone detaily reviews the phase compositions, structure and thermal properties of the source gold refractory ores using physical methods that allowed determining

get price

MICROBIAL PRE-TREATMENT OF DOUBLE REFRACTORY GOLD

process recorded the best gold extraction of 81.5% for sample A. S. Setonii degraded carbonaceous matter unlike T. versicolor which passivated it. However, it takes only 3 7 days for T. versicolor to effect passivation and eliminate preg-robbing while 14 56 days is required for S. setonii to degrade carbonaceous matter significantly.

get price

Gold Processing,Extraction,Smelting Plant Design

Gold ore . Prominer maintains a team of senior gold processing engineers with expertise and global experience. These gold professionals are specifically in gold processing through various beneficiation technologies, for gold ore of different characteristics, such as flotation, cyanide leaching, gravity separation, etc., to achieve the processing plant of optimal and cost-efficient process designs.

get price

(PDF) Pressure oxidation of double refractory gold

Preg-robbing is an important phenomenon that inhibits gold recovery due to the presence of naturally occurring carbonaceous matter. In case of certain ores, gold recovery by cyanidation is limited

get price

Western University [email protected]

Carbonaceous gold ores have the ability to adsorb gold (I) cyanide from leach solutions during processing. This phenomenon, known as preg-robbing, is responsible for poor recoveries as the carbonaceous materials of the ore compete with activated carbon used during the leaching and adsorption phase of processing.

get price

The leaching and adsorption behaviour of gold ores

of the two processes governed the distribution of gold between the ore and the carbon. Gold was found to reduce at the chalcopyrite surface and a mechanism for this reduction was proposed. 1.2.4 CIP/CIL processing of ores 5 2.5.1 Preg-robbing by carbonaceous matter 2.5.2 Preg-robbing by minerals 2.6 ADSORPTION ONTO ACTIVATED CARBON

get price

Process for treating refractory gold ores by roasting

Preg-robbing is an important phenomenon that inhibits gold recovery due to the presence of naturally occurring carbonaceous matter. In case of certain ores, gold recovery by cyanidation is limited

get price

Gold Extraction from a High Carbon Low-Grade Refractory

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 %. In this , by the process of flotation-roasting-leaching, gold was effectively enriched and extracted.

get price