Gold
Browse 60 curated documents about gold in The Archive — the 2RA-Edition digital library for engineering and scientific research. This collection of books, journal articles, theses, reports, and technical documents on gold spans extractive metallurgy, mining engineering, chemistry, and applied science. Every document is searchable in full text; sign in to read, download, ask AI questions about any document, or generate cited research drafts with the AI Researcher.
Barrick Goldstrike Roaster Facility Roasting and Gas Handling
A. Cole, J. McMullen
The roasting and gas handling circuits at Goldstrike's new Roasting Facility incorporate proven technologies in a unique combination. The objective was to recommend the most robust and economical process for Goldstrike's carbonaceous resources and optimize roast conditions based on prior extensive testing. A series of pilot plant campaigns were conducted using Freeport-McMoRan's whole ore roasting
Roasting developments: especially oxygenated roasting
K G Thomas, A P Cole
Roasting of refractory gold ores is a crucial commercial process utilized to treat various refractory gold ores and concentrates, aimed at altering the physical, chemical, and mineralogical properties of the ore constituents. This study examines the effectiveness of different roasting configurations, such as single- and two-stage fluid bed roasters, which process ores under varying conditions to o
GOLD RECOVERY FROM WASTE PRINTED CIRCUIT BOARD IODIDE LEACHATES USING A NOVEL MEMBRANE-BASED ELECTROWINING PROCESS
Ngeleka Marco Mukuna, Jochen Petersen
The hydrometallurgical recovery of gold from waste printed circuit boards is considered a promising recycling technique. This paper presents the findings from a study investigating the feasibility of a hydrometallurgical technique to recover gold from waste printed circuit board iodide leachates using a novel membrane-based electrowinning process. Findings showed that the investigated novel proces
HYDROCOPPERTM- ECONOMICAL TREATMENT FOR COPPER AND GOLD CONCENTRATES AT THE MINE SITE
Olli Hyvärinen, Pertti Lamberg
The HydroCopperTM process, developed by Outokumpu Technology, introduces a novel chloride leaching method for the efficient treatment of copper sulphide concentrates directly at the mine site, aiming to enhance copper production and facilitate the utilization of low-grade ores. This study investigates the feasibility of the HydroCopperTM technology, which not only allows for the extraction of high
Copper-Gold Interaction During the Processing of Copper-Gold Ores
T Tran, H H Nguyen
The treatment of copper-gold ores presents significant challenges due to the interaction between copper minerals and cyanide leach solutions, which complicates gold recovery. This study seeks to elucidate the specific mechanisms behind this interaction, focusing on the role of various copper minerals such as azurite and chalcocite, whose dissolution in cyanide exacerbates the consumption of cyanid
HEAP LEACHING TECHNIQUE in MINING Within the Context of BEST AVAILABLE TECHNIQUES (BAT)
Caner Zanbak
This document provides an overview of heap leaching, a mining technique crucial for the economic extraction of certain ores that may otherwise remain unexploitable. The objective is to present heap leaching within the framework of Best Available Techniques (BAT) as established by European regulations. A comprehensive methodology employed includes gathering insights from industry experts and litera
Self-Organizing Maps Analysis of Chemical–Mineralogical Gold Ore Characterization in Support of Geometallurgy
Fabrizzio Rodrigues Costa, Cleyton de Carvalho Carneiro
Few studies have been published on the analysis and correlation of data from process mineralogical studies of gold ore employing artificial neural networks (ANNs). This study aimed to analyse and investigate the correlations obtained by the technological characterization of auriferous ore using an ANN called self-organizing map (SOM) to support geometallurgical studies. The SOM is a data analysis
Bioleaching of Gold from Silicate Ore by Macrococcus caseolyticus and Acinetobacter calcoaceticus: Effect of Medium, Amino Acids and Growth Supernatant
Kanjana Kudpeng, Parinda Thayanukul
The aims of this work were to study the gold leaching by the isolated bacteria from silicate ore. Three strains were isolated and identified as Macrococcus caseolyticus, Acinetobacter calcoaceticus, and Bacillus sp. MBEA40. However, only M. caseolyticus and A. calcoaceticus were capable of gold bioleaching. In order to examine only the effect of microorganisms involved in the gold bioleaching proc
Adsorption behaviour of copper and gold glycinates in alkaline media onto activated carbon. Part 1: Isotherms
P.J. Tauetsile, E.A. Oraby
Alkaline glycine/glycinate solutions have been shown to have significant potential in the leaching of gold and copper from ores, concentrates, and wastes bearing these metals. An attempt was made to understand the adsorption behaviour of the gold glycinate complex onto activated carbon in the presence of copper for a pure alkaline glycine/glycinate system, after the gold has been dissolved using h
Adsorption behaviour of copper and gold Glycinates in alkaline media onto activated carbon. Part 2: Kinetics
P.J. Tauetsile, E.A. Oraby
The kinetics for the competitive adsorption of gold and copper onto activated carbon from synthetic alkaline glycine solutions was studied. The adsorption rate for both gold and copper at the initial stage was modelled using the Fleming k,n adsorption kinetic model. The coefficient of variation (R 2) of the model were close to unity for both gold and copper adsorption data. The effects of pH, free gl
Activated carbon adsorption of gold from cyanide-starved glycine solutions containing copper. Part 2: Kinetics
P.J. Tauetsile, E.A. Oraby
The downstream processing of leachates arising from the dissolution of copper-bearing gold ores in cyanide-starved alkaline glycine solutions is imperative for the successful implementation of the new leach system at industry level. This study investigates the behaviour of gold adsorption onto activated carbon in the presence of copper from cyanide-starved glycine solutions. The adsorption behavio
The leaching and adsorption of gold using low concentration amino acids and hydrogen peroxide: Effect of catalytic ions, sulphide minerals and amino acid type
J.J. Eksteen, E.A. Oraby
The leaching of gold using alkaline amino acids–hydrogen peroxide solutions at low concentrations has been studied. The application of alkaline amino acid–hydrogen peroxide system may offer an alternative and environmentally benign process for gold leaching, particularly in the context of leaching low grade gold ores in an in-situ or in heap leach processes. In the presence of an oxidant or oxidan
Investigation of glycine leaching for gold extraction from Witwatersrand gold mine tailings with permanganate pre-treatment
A. Tapfuma, G. Akdogan
The Southern African region contains abundant gold tailing heaps that are an environmental concern due to dust pollution and chemical contamination of nearby water bodies. Nevertheless, these heaps contain gold with potential to be extracted for financial gain. In this study, the feasibility of extraction of gold from a Witwatersrand gold tailings using glycine was investigated using a two-level f
Gold leaching in cyanide-starved copper solutions in the presence of glycine
E.A. Oraby, J.J. Eksteen
In the context of gold extraction from copper-gold ores via cyanidation, this study investigates the challenges posed by copper minerals, which can result in gold losses and cyanide consumption. The objective of this research is to present a method that enhances gold dissolution using cyanide-starved copper-cyanide solutions in the presence of glycine. The methodology involves evaluating the impac
Gold Leaching from Printed Circuit Boards Using a Novel Synergistic Effect of Glycine and Thiosulfate
Kasun Godigamuwa, Naoko Okibe
Printed circuit boards (PCBs) are a secondary source for the extraction of precious metals, such as gold (Au), silver (Ag), platinum (Pt), and palladium (Pd). Thiosulfate and glycine systems have gained significant attention for Au leaching. However, in the thiosulfate system, stability of leached Au tends to decrease with lower thiosulfate concentrations. This study combined a copper–ammonia–thio
Gold leaching from oxide ores in alkaline glycine solutions in the presence of permanganate
E.A. Oraby, J.J. Eksteen
In this study, the effect of using strong oxidants with alkaline glycine solutions on the leach rate and recovery of gold was studied in the absence of cyanide. Prior research indicated that when using only alkaline glycine and air at ambient temperature in the absence of catalysts, leaching times would be too long for conventional agitated tank leaching of ores. The ores used in this study were f
Electrolysis of Gold from Filtration Waste by Means of Mechanical Activation
Jana Ficeriová, Peter Baláž
The intensification of gold thiourea leaching from filtration waste (Košice, Slovakia) using mechanical activation as a pretreatment step has been studied. The research aimed to enhance gold recovery from waste materials through the electrolysis process. The methodology involved mechanical activation of the filtration waste in a planetary mill, followed by leaching in an acid thiourea solution. Re
Comparative Study of Gold Concentration by Elutriation from Different Precious Metal Bearing Ores
Martín A. Encinas-Romero, Guillermo Tiburcio-Munive
Conventional methods for precious metals gravimetric concentration involve various equipment including shaking tables, centrifuging concentrators, jigs, and trommels. Elutriation emerges as a less commonly utilized yet efficient and low-cost separation technique. This study aims to compare gold concentration by elutriation from four different precious metal-bearing ores: oxide ore, sulfide matrix
Continuous Laboratory Gold Solvent Extraction from Cyanide Solutions using LIX 79 Reagent
S. Aguayo, J. R. Parga
Continuous laboratory solvent extraction of gold from cyanide solutions was conducted using LIX 79 guanidine-based extractant to evaluate variables impacting extraction efficiency, such as aqueous pH, extractant concentration, and modifier concentration. The extraction isotherms revealed a selectivity order for the aurocyanide complex with respect to other cyanoanions: Au > Ag > Cu > Zn > Fe. Opti
A study of the electrochemical dissolution and passivation phenomenon of roasted gold ore in cyanide solutions
Ahmet Deniz Basa, Wei Zhanga
This study investigates the electrochemical interactions between gold and its associated oxide minerals either in one (OC) or two separate containers (TC) in the presence or absence of slurry. Magnetite showed a negative effect on gold leaching, while maghemite and hematite demonstrated a positive effect, relatively. The presence of slurry generally resulted in lower current densities. However, wh
Electrochemical dissolution of roasted gold ore in cyanide solutions
Ahmet Deniz Bas, Liliana Gavrila
This study investigates the electrochemical dissolution behavior of roasted gold ore (RGO) in cyanide solutions, aiming to identify optimal leaching conditions and corrosion rates. Utilizing free corrosion tests and electrochemical noise measurements, it was found that pure gold exhibits more active behavior compared to RGO, with an initial increase in corrosion rate for gold that plateaus for RGO
Determination of gold(I) and silver(I) cyanide in ores by capillary zone electrophoresis
Manuel Aguilar, Adriana Farran
Capillary zone electrophoresis (CZE) with on-column UV detection at 214 nm was used to detect and determine gold(I) and silver(I) cyanide complexes in alkaline cyanide solution. Under an applied voltage of 25 kV, dicyanoaurate(1) and dicyanoargente(I) were separated in less than 6 min. Carbonate buffer was used and the separation of both anions was achieved using an anodic injection and cathodic d
Determination of metal cyanide complexes in gold processing solutions by capillary electrophoresis
Manuel Aguilar, Adriana Farran
A capillary electrophoresis method to determine metal cyanide complexes and sulphur compounds in gold processing solutions using direct UV absorbance detection has been developed. The method is based on the use of electroosmotic flow modifiers, such as CITH38NBr, to control the separation and in the on-column concentration of the sample by using the stacking effect to increase the sensitivity. By
THE RECOVERY OF PLATINUM, PALLADIUM, AND GOLD FROM A CYANIDE HEAP SOLUTION, WITH USE OF ION EXCHANGE RESINS
E Schoeman, S M Bradshaw
Ion exchange resins were investigated for the effective recovery of platinum, palladium, and gold from a pregnant cyanide heap leach solution. Screening results indicated that strong-base anion exchange resins proved to be most effective in the recovery of these metal cyanides. Gold was selectively recovered with the use of Minix, while effective recovery of gold, platinum, and palladium over the
On the use of zinc for gold cementation from ammoniacal–thiosulphate solutions
P. Navarro, R. Alvarez
The use of zinc as a cementation agent for gold from ammoniacal–thiosulphate solutions has been studied. The objective of this research was to investigate the experimental variables influencing this cementation process, including pH (ranging from 9 to 10.5), thiosulphate concentration (0.05 to 0.4 M), temperature (from 5 to 50°C), and the presence of zinc and Cu(II) ions in the solution. A systema
Kinetic Aspects of Gold and Silver Recovery in Cementation with Zinc Power and Electrocoagulation Iron Process
Gabriela V. Figueroa Martinez, José R. Parga Torres
The Merrill-Crowe or Cementation process is employed for the concentration and purification of gold and silver extracted from cyanide solutions. This study investigates the kinetic aspects of traditional cementation and a novel electrocoagulation (EC) technique for recovering precious metals from cyanide solutions. Initially, the fundamentals of both processes are introduced, followed by a compreh
Factors affecting the elution of Pt, Pd and Au cyanide from activated carbon
C.A. Snyders, S.M. Bradshaw
Several factors affecting the elution of Pt, Pd and Au cyanide complexes in a manner similar to the AARL process have been investigated. Temperature, the cyanide pre-treatment concentration and the ionic strength of the eluant have been found to affect Pt and Pd elution substantially and will be critical factors in the design of an elution process. An acid (HCl) pre-treatment step increased the el
The leaching of gold, silver and their alloys in alkaline glycine–peroxide solutions and their adsorption on carbon
E.A. Oraby, J.J. Eksteen
The leaching of gold and silver in a pH modified glycine solution in the presence of hydrogen peroxide was investigated. It was found that this lixiviant system can dissolve gold and/or silver under neutral and alkaline conditions at ambient to moderately elevated temperatures (23–60 °C). The gold leaching rate in solutions containing 0.5 M glycine and 1% peroxide at pH 11 after 48 h of leaching w
Evaluation of the Merrill–Crowe process for the simultaneous removal of platinum, palladium and gold from cyanide leach solutions
C.N. Mpinga, S.M. Bradshaw
Studies were conducted to evaluate the Merrill–Crowe cementation method for the simultaneous extraction of platinum, palladium and gold associated with copper and nickel from cyanide solutions, particularly high temperature eluates from carbon adsorption and desorption process. The paper reviews the Merrill–Crowe method and its potential for platinum and palladium recovery in the presence of gold,
Layout and Design of a Modern Gold Concentrator
Kilborn Limited
This paper discusses the layout and design of a modern gold concentrator, specifically detailing the Kiena Gold Mines Limited project located in northwestern Quebec. The objective of the presentation was to showcase a recent project as a case study in response to an invitation to present at the McGill Mineral Processing of Gold Ores Seminar. Methodologically, the paper outlines the engineering pro
Effect of Heat Treatments on Au – Fe Oxide Catalysts for Low Temperature CO Oxidation
Matthew S. Hall, Philip Landon
Gold/iron oxide catalysts have been prepared and their catalytic performance evaluated for low temperature CO oxidation. The method and temperature used to dry the sample has a significant effect on their catalytic activity. Analysis by transmission electron microscopy (TEM) revealed the catalysts contained Au particles; however, catalysts with high and low activity did not always differ in their
Basic Cyanide Chemistry
MICHAEL M. BOTZ
This handbook presents a comprehensive examination of cyanide's interactions with gold, silver, and other metals, enhancing the understanding of these processes and their influence on leach solutions and ore processing. It offers a thorough classification of cyanide species along with insightful commentary on their analysis. The text concludes with a detailed overview of the physical properties of
Chemistry of Gold Extraction
Mineekshi Awasthi
This book provides a comprehensive overview of the chemistry involved in gold extraction processes. The objective is to present current methodologies and advancements in gold extraction to enhance understanding among researchers and practitioners in the field. The methodology includes a detailed review of various techniques and approaches utilized in the extraction of gold from ores and concentrat
ENRICHMENT OF GOLD IN LOW GRADE COPPER MATTE FROM ARSENICAL REFRACTORY GOLD CONCENTRATE VIA MATTE SMELTING METHOD
Duchao Zhang, Qingkai Xiao
To solve the problem of low leaching ratio of direct gold cyanide leaching from arsenical refractory gold concentrate, this paper proposed a matte smelting process for gold enrichment in low grade copper matte. The effects of copper content in the mixed material, ratio change in slag type, smelting temperature and reaction time on recovery rate of gold and copper were investigated. The experimenta
Correlation between gold and mercury in human blood among individuals in northwestern Tanzania
Zakir Bulmer, Megan Willkens
Mercury is a highly toxic metal of major global health concern, with exposure disproportionately affecting low- and middle-income countries (LMICs) where artisanal and small-scale gold mining (ASGM) is common. While mercury exposure has been well documented among mining populations, less is known about exposure in general urban populations. We analyzed baseline data from 1000 adults enrolled in th
THE RATE OF GOLD DISSOLUTION IN CONCENTRATED CUPRIC CHLORIDE SOLUTIONS
R. von Bonsdorff, J. Aromaa
Electrochemical and quartz crystal microbalance (QCM) methods were used to investigate the dissolution rate of gold in an Outokumpu HydroCopper® process solution. The measurements were conducted in an electrolyte solution where [NaCl] = 2.8 - 280 g/l, pH = 1 -2.5, [Cu 2+] = 0 -30 g/l and T = 70 -95 °C. According to these measurements the solution flow has the greatest impact on the dissolution rat
Impact of precipitate characteristics and precipitation conditions on the settling performance of a sulfide precipitation process: An exhaustive characterization of the aggregation behavior
Minghai Gim-Krumm, Michelle Quilaqueo
The sulfide precipitation process is currently the most successful technology for recovering cyanide and copper in cyanidation gold plants. The application of this chemical process has been implemented in the SART (Sulfidization, Acidification, Recycling, and Thickening) process. This process includes thickening and filtering unit operations to separate the solids precipitated in the sulfidization
MINATAUR™: the Mintek alternative technology to gold refining
S.A. Scott, K. Matchett, A.M. FEATHER, W.B. BOUWER
This paper presents the Minataur™ leach-solvent extraction-precipitation technology developed by Mintek as a cost-effective alternative to traditional gold refining processes. The objective of this study is to detail the operational methodology and advantages of the Minataur™ process, which was first commercialized at the Harmony Gold Refinery. The methodology involves three key operations: dissol
The flotation of gold, uranium, and pyrite from Witwatersrand ores
P. J. D. LLOYD
The Witwatersrand reefs contain gold, uranium, and pyrite in varying average concentrations, presenting unique challenges for mineral recovery. This study aims to explore the flotation processes of these three species, focusing on the simultaneous recovery of gold, uranium, and pyrite. A comprehensive review of existing literature and methodologies was conducted, emphasizing the production of sulp
Gold electrowinning/replate circuits at Gold Fields Ortiz
J.R. Arnold, W. J. Pennstrom
In 1981, Gold Fields implemented the mining industry's inaugural commercial gold electrowinning/replate circuit at Ortiz, which has since operated successfully, influencing a similar project at Mesquite initiated in early 1986. This study outlines the operational details of these circuits that produce gold foil ready for direct shipment to refineries or for melting into bars. The methods employed
KINETICS MECHANISM OF GOLD ELECTROWINNING
I.A. Garcia, C. Hecker
To determine the kinetic reaction mechanism, electrochemical experimental techniques of stationary polarization, linear voltammetry and faradaic impedance were used. Gold electrodeposition experiments were realized using an electrolysis cell, provided by a rotary disk of vitreous carbon and a platinum counter electrode along with a reference electrode. An automatic measurement system was employed
AN INVESTIGATION ON GOLD ELECTROWINNING FROM ACIDIC THIOUREA SOLUTIONS
Carlos M. Juarez, Achilles J. B. Dutra
The use of thiourea as a gold leaching reagent has been extensively studied by many researchers, and it has proved to be promising for some cases as refractory ores. However, the recovery of gold from these solutions did not receive as much attention. This paper investigates the electrowinning of gold in acidic thiourea solutions using voltammetry and chronopotentiometry. An adsorption step was de
A study of the influence of copper on the gold electrowinning process
J. Steyn, R.F. Sandenbergh
Electrowinning is an attractive method for the recovery of gold from concentrated aurodicyanide solutions produced during the elution of loaded carbon. This study investigates the influence of base metals, particularly copper, on the electrowinning process. Given that gold typically exists in the form of aurodicyanide (Au(CN)2-), it is crucial to understand how the presence of base metals can affe
The Gold Electrowinning/Replate Circuits at Gold Fields' Ortiz and Mesquite Operations
J. R. Arnold, W. J. Pennstrom
The pursuit of effective gold recovery from cyanide solutions has presented a longstanding challenge in metallurgy, particularly since the inception of the cyanidation process. This study aims to present a viable method developed by Gold Fields that demonstrates efficiency and cost-effectiveness in producing a refinery-ready gold product, distinct from traditional electroplating techniques. The me
SMALL SCALE VAT LEACHING
Robert B. MURDOCH
This paper discusses the effective methodologies for processing low tonnage, high-grade precious metal ore bodies using a small scale vat leaching approach, as an alternative to traditional methods such as CIP (Carbon in Pulp) and CIL (Carbon in Leach). The objective is to highlight the potential of small mining partnerships, like Ban Ban Mining in Queensland, in economically extracting value from
Leaching of sulphated calcine
P.J. Colbert
Fluid bed sulphation roasting followed by leaching at low pH was developed as a means of separating copper and bismuth from a mixture of flotation concentrates and flash furnace flue dust. A 65 tonne/day plant was established and typically achieves 89 percent copper extraction with negligible bismuth and iron extraction. Acid-chloride leaching of bismuth from copper leach residue was then establis
Thiosulphate Leaching of Gold/Silver from a Copper-Bearing Pyritic Gold Concentrate
F. Ahlatcı, Ersin Y. Yazici
There are increasingly stricter environmental regulations imposed for use of cyanide leaching for the extraction of gold from ores. Alternative lixiviants to cyanide, preferably with low toxicity, have been extensively studied. Thiosulphate has emerged as one of the most suitable alternative leaching agents in place of cyanide due to its low toxicity and technical attributes such as fast leaching
Metal Selective Processing from the Los
Germán Velásquez, Humberto Estay
Sulfides extracted from porphyry-type deposits can contain a number of metals critical for the global energy transition, e.g., Co and precious metals such as Au and Re. These metals are currently detrimental on composite mineral samples, which commonly results in their dilution. Thus, it is possible that some metals of interest are overlooked during metallurgical processing and are subsequently lo
Anaerobic thiosulfate leaching Developme
J.A. Heath, M.I. Jeffrey
Ferric EDTA and ferric oxalate complexes are both effective oxidants for the aerobic and anaerobic dissolution of gold in thiosulfate solutions, and therefore are potential candidates for the development of an in situ leaching system. The thiosulfate and polythionates were quantified during leaching using HPLC with perchlorate eluent and an anion exchange column, and it was found that both the iro
Treatment of a refractory gold copper su
M.G. AYLMORE
The investigation aimed at exploring the potential for leaching gold directly from a refractory gold-copper sulfide concentrate using ammoniacal thiosulfate with copper, as an alternative to the traditional methods of roasting and cyanidation. A series of leaching experiments were conducted using a solution consisting of 0.8M S2O3 2-, 0.05M Cu2+, and 4M NH3, achieving over 90% gold and 60% silver
Thiosulfate Leaching Of The Auriferous O
Rui Sousa, Aurora Futuro
The exploitation of gold ore deposits is highly dependent on efficient mineral processing methods, although actual perspectives based on life-cycle assessment introduce difficulties that were unforeseen in a very recent past. Cyanidation is the most applied gold processing method, but the potential environmental problems derived from the usage of cyanide as leaching reagent led to a demand for alt
Recovery of gold from thiosulfate soluti
Glen Peter O'Malley
With growing environmental and occupational safety concerns over the use of cyanide in gold processing, more acceptable alternatives are receiving increased interest. The most promising of the possible alternatives is thiosulfate. However, as activated carbon is not an effective substrate for the adsorption of the gold thiosulfate complex, the thiosulfate process lacks a proven in-pulp method for
Optimization of Gold Dissolution Paramet
Jeanne Pauline Munganyinka, Jean Baptiste Habinshuti
The nature of gold (Au) ore deposits plays an essential role in determining the best gold recovery method as an alternative to cyanidation, considering environmental concerns. Thiourea (Tu) leaching of gold is an alternative lixiviant for treating sulfide gold ores and concentrates. The present study investigated the leaching behavior of Au from sulfide gold ore concentrates obtained from the Crip
Gold Leaching in Thiosulfate Oxygen Solu
Onias Sitando
Thiosulfate has received much attention as an alternative non-cyanide lixiviant for gold recovery over the last three decades. In particular, a number of studies have shown that an ammoniacal copper(II)-sulfate/sodium thiosulfate system offers fast leaching kinetics but there are difficulties in controlling the complex solution chemistry and there are concerns over the use of ammonia. Recently, th
A thermodynamic study of the dissolution
J.L. Broadhurst, J.G.H. du Preez
This study investigates the thermodynamics of gold dissolution in an acidic aqueous thiocyanate medium with iron(III) sulphate as an oxidant. The primary objective is to elucidate the complex chemistry involved and to predict the feasibility and optimal conditions for gold leaching operations. To achieve this, species distribution and pH–potential diagrams were constructed based on previously publ
A Review of Thiosulfate Leaching of Gold
Bin Xu, Wenhao Kong
Thiosulfate leaching is a promising alternative to cyanidation, and the main hindrances for its wide commercial application are the high thiosulfate consumption and the difficult recovery of dissolved gold. In this review, the four solutions to reduce the consumption of thiosulfate, including the control of reaction conditions, the use of additives, the generation of thiosulfate in situ, and the r
AMMONIACAL THIOSULPHATE LEACHING OF A COPPER-RICH GOLD ORE
A. Deniz BAS, Elif OZDEMIR
In this current study, the extraction of gold from a high grade copper-rich gold ore by copper-assisted ammoniacal thiosulphate leaching was studied by adopting Taguchi L9, (3^3) experimental design approach. The effects of concentration of thiosulphate, (10-500 mM S2O32-), copper (0-25 mM Cu2+), and ammonia (5-1000 mM NH3) on the extent of gold extraction were investigated at three levels. Statis
Significant Resource Upgrade to 6.4 Million Ounces of Gold
Jason Greive
The Pani Gold Project located in Gorantalo Province, Sulawesi, Indonesia, has undergone a significant resource upgrade, resulting in a combined Mineral Resource Estimate (MRE) of 6.4 million ounces of gold. The objective of this study was to determine the mineralization characteristics and resource potential of the project following an extensive drilling program. Methodologically, the MRE was esta
Copper electrowinning from gold plant wa
F.A. Lemos, L.G.S. Sobral
Gold mining industries produce considerable amounts of waste streams containing cyanide and small quantities of copper, gold, and other heavy metals. This effluent is generally treated by the AVR process to recycle cyanide for the leaching operation; however, this process is ineffective for treating stable cyanide complexes. This paper investigates the feasibility of copper electrowinning along wi
Ammonium thiosulfate leaching of gold from printed circuit board waste
P. Albertyn, C. Dorfling
Hydrometallurgical recovery of metals from printed circuit board waste typically involves multiple leaching stages; conventionally, base metals dissolution by mineral acids is followed by leaching of gold using cyanide or halide based lixiviants. Alternative lixiviants for gold leaching can reduce the potential hazardous nature of operation. The aim of this study was to investigate the feasibility