Pretreatment of a refractory arsenopyritic gold ore using hydroxyl …
An arsenopyrite refractory ore was pretreated with NaOH to increase gold extraction. After pretreatment, gold and silver were leached with copper ammonium thiosulfate solution. Thiosulfate leaching of the as-received ore extracted only 21% and 29% of silver and gold, respectively.Web
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Gold Ore
A typical arsenical gold ore contains arsenopyrite as the major arsenic mineral. However, some arsenical gold ores, such as those from Nevada in the USA (Getchel deposit), …Web
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Invisible gold in arsenian pyrite and arsenopyrite from a …
The Sunrise Dam gold mine (11.1 Moz Au) is the largest deposit in the Archaean Laverton Greenstone Belt (Eastern Goldfields Province, Yilgarn Craton, Western Australia). The deposit is characterized by multiple events of fluid flow leading to repeated alteration and mineralization next to a major crustal-scale structure. The Au content of …Web
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Minerals | Free Full-Text | Specific Refractory Gold Flotation and …
This paper presents a research overview, reconciling key and useful case study findings, towards uncovering major causes of gold refractoriness and maximising extraction performance of specific gold flotation and bio-oxidation products. Through systematic investigation of the ore mineralogical and gold deportment properties, …Web
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Study of the Mechanism of Dearsenification of Arsenopyrite
It is well known that pyrite and arsenopyrite are important gold-bearing sulfide minerals and that arsenopyrite is a sulfide ore with high oxidation activity. Previous studies have shown that in the process of bacterial oxidation, the oxidative decomposition of pyrite is mainly direct, while that of arsenopyrite is mainly indirect [ 9 ].Web
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Arsenopyrite Mineral | Uses and Properties
Arsenopyrite as a Source of Gold Arsenopyrite By Other Names Uses of Arsenopyrite and Arsenic Arsenic in Groundwater Caution: A Toxic …Web
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Gold-bearing arsenopyrite and pyrite in refractory ores: analytical
Abstract. A multidisciplinary approach has been used to study Au occurrences within pyrite and arsenopyrite in four refractory Au ores from Colombia, France (Le …Web
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Alkaline Oxidative Leaching of Gold-Bearing Arsenopyrite …
low-grade gold ore and a bulk sulfide flotation concentrate prepared from it. Cyanidation of the leach residues resulted in 70 pct Au and 31 pct Ag extraction. The NaOH leachate was partially regenerated ... leaching procedure for treating gold-bearing arsenopyrite (FeAsS) ore, as one of the continuing efforts to developWeb
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Revealing the Chemical Form of "Invisible" Gold in …
The structural chemistry of gold in arsenian pyrite (FeS 2) and arsenopyrite (FeAsS) is as yet unknown, despite the economic importance of this element and its potential recovery from low-grade ores and mine …Web
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Mineralogical characteristics and recovery process optimization
The gold particles of ALRG gold ore are almost wrapped by pyrite and arsenopyrite, and the direct gold leaching extent is less than 40 %, making it an extremely refractory gold ore. The ore sample in this study has an extremely low gold content of 0.85 g·t −1, iron content of 3.21 %, sulfur content of 2.27 %, and arsenic content of 0.19 %.Web
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Textures and trace element signatures of pyrite and arsenopyrite …
The Gutaishan deposit is a slate-hosted lode Au–Sb deposit in the Xiangzhong Sb–Au metallogenic province, South China. The deposit has a proven reserve of ca. 9 -t gold at an average grade of 13-g/t and contains 2500-t Sb. The deposit represents the product of a complex ore-forming process, comprising four different stages, of which …Web
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Gold Mysteriously Concentrates Around Arsenic, and Scientists …
Other gold discoveries come in nuggets, but most of them are extracted from ores and other minerals. Among the ores that contain gold are iron and arsenic minerals like pyrite and arsenopyrite ...Web
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Phase relations of arsenian pyrite and arsenopyrite
In the deposits without arsenopyrite, arsenic content in pyrite can reach 20 wt% As. We consider three principal scenarios of the relations of arsenian pyrite and arsenopyrite: (A) Pyrite with high As content is stable in equilibrium with arsenopyrite. Low-As pyrite coexisting with arsenopyrite is a product of disequilibrium crystallisation; …Web
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Phase relations of arsenian pyrite and arsenopyrite
Highlights. Pyrite with As above 1 wt% and called arsenian pyrite is an essential phase in ore deposits and sedimentary rocks. Assemblages of arsenopyrite with pyrite containing <1 wt% are typical in ore deposits. The experimental studies synthesised pyrite with about 1 wt% in equilibrium with arsenopyrite.Web
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Mineralogy and Geochemistry of Pyrite and Arsenopyrite from the
The gold orebodies are strictly controlled by the NE-, NW-, and SN-trending tensional and shearing faults with high dipping angle. The mineralogy and geochemistry …Web
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Researchers discover why gold is concentrated alongside arsenic
Some gold is found as gold nuggets, but an appreciable amount is bound up with minerals. Gold is known to be related to iron- and arsenic-containing minerals, such as pyrite and arsenopyrite.Web
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Arsenopyrite
Arsenopyrite is a hard metallic iron arsenic sulfide with steel gray to silver-white color, and the major source of arsenic. The mineral in purest form contains 46.0% As, 34.3% Fe, and 19.7% S, which turns it chemically toxic. The mineral is associated with sulfide orebodies and gold deposits. Arsenopyrite is the major source of arsenic ...Web
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Arsenic removal strategy in the processing of an arsenopyritic
The refractoriness of gold minerals containing arsenopyrite usually originates from the encapsulation of gold in this phase (Chen et al., 2002; Marsden and House, 2006). The refractory characteristics of this arsenopyritic gold ore was confirmed in a previous publication (Mesa Espitia and Lapidus, 2015). In the cyanide bottle roll test for the ...Web
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The recovery of gold from refractory arsenopyrite concentrates by
A gold bearing arsenopyrite concentrate was characterised, and found to consist of 70% arsenopyrite and 25% pyrite with a small amount of stibnite and …Web
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Gold Process Mineralogy: Objectives, Techniques, and
scopic gold in arsenopyrite and pyrite and is recovered by roasting a fl otation concentrate followed by cyanidation. 6 OBJECTIVES Process mineralogy is often used to predict the response of a gold ore to the various candidate processes. In addition, during the processing of a gold ore, periodic mineralogical analyses of oreWeb
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Depth profiling of arsenian pyrite in Carlin-type ores through wet
Enrichment of As and Au at the overgrowth rims of arsenian pyrite is a distinctive feature of Carlin-type gold ores. Revealing distribution of such key elements in high resolution is of fundamental importance yet often proves challenging. In this study, repeated non-oxidative acid etching of ore samples from Shuiyindong gold deposit was …Web
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Composition and Ligand Microstructure of Arsenopyrite from Gold Ore
The Möss spectroscopy method was used to study the ligand microstructure of natural arsenopyrite (31 specimens) from the ores of the major gold deposits of the Yenisei Ridge (Eastern Siberia, Russia). Arsenopyrite and native gold are paragenetic minerals in the ore; meanwhile, arsenopyrite is frequently a gold carrier. …Web
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Arsenopyrite-Pyrite Association in an Orogenic Gold Ore: Tracing
Gold distribution patterns in the arsenopyrite-pyrite assemblage, which probably crystallized toward the end of the Au-forming event, suggest a process of initial scavenging of Au into arsenopyrite and subsequent remobilization of that Au following …Web
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Mineral characterization of low-grade gold ore to support …
Mineralogical ore characterization, such as gold distribution, grain size and mode of occurrence, together with density separation, cyanidation and diagnostic leaching tests, are the key for the appropriate process design of the geometallurgy concept. The present research focuses on the development of a mineralogical characterization of low ...Web
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Optimizing the alkaline oxidation pretreatment of a refractory gold ore
Res. Express 10.1088/2053-1591/aae196. This study investigates the alkaline oxidation pretreatment process of Zarshuran refractory gold ore. Taguchi method-orthogonal array design (OAD) is applied to evaluate and optimize the influence of five main factors including solution pH, aeration rate, agitation speed, temperature, and oxidation …Web
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Composition and Ligand Microstructure of Arsenopyrite from Gold …
Composition and Ligand Microstructure of Arsenopyrite from Gold Ore Deposits of the Yenisei Ridge (Eastern Siberia, Russia) by Anatoly M. Sazonov 1,*, …Web
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Gold Ore Roasting Techniques
Roasting Arsenopyrite Ore for Gold. ... Roasting and Processing Sulpho-telluride ore to recover gold. This roasting plant, since closed down, was equipped with eight standard 70-spindle Edwards roasters, though only four were finally in use. Fuel was supplied to four ports on each furnace in the form of pulverized lignite of 8500 B.t.u. value ...Web
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Gold in Arsenopyrite | Gold Refining & Metal Extraction Forum
If it is arsenopyrite then you are dealing with a refractory ore. 16 oz/ton sounds enticing, but it will not be easy to get it out, especially considering a ton of pure material is over 30% arsenic by mass. You could make some money off the arsenic as well as the gold! So you have FeAsS with gold entrained in the lattice.Web
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Ultrafine Grinding
Gold in refractory sulfide ores occurs as fine inclusions or in solid solution typically within pyrite, marcasite, and arsenopyrite grains. In this type of ore, because the gold is encapsulated, the interaction with cyanide to form the soluble metal complex is inhibited (Marsden and House, 2006; La Brooy et al., 1994).Web
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Trace-element geochemistry of pyrite and arsenopyrite: ore …
The distribution of Au and associated trace elements in pyrite and arsenopyrite from late Archean Hutti and Hira-Buddini orogenic gold deposits, eastern Dharwar Craton, southern India was investigated by laser ablation-inductively coupled plasma-mass spectrometry.Web
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