The Golden Ridge gold deposit is located in southwestern New Brunswick, in the Canadian Appalachians. Gold mineralization is consistently associated with acicular arsenopyrite, and to a lesser degree with pyrite, disseminated in host rocks, sulphide veinlets, quartz-carbonate veins, and the breccia matrix. According to petrographic …
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Arsenian pyrite containing above 1 wt% As plays a crucial role in deposition and deportment of Au and other chalcophile elements. The importance of arsenian pyrite …
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In this work, a multi-technical bulk and surface analytical approach was used to investigate the bioleaching of a pyrite and arsenopyrite flotation concentrate with a mixed microflora mainly consisting of Acidithiobacillus ferrooxidans. X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and X-ray-induced Auger electron spectroscopy …
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The major- and trace-element chemistry of pyrite and arsenopyrite from the mesothermal Roudny´ gold deposits was studied by electron microprobe and laser ablation ICP-MS techniques.
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Mineralogical Magazine, April 2007, Vol. 71(2), pp. 123–142 Gold-bearing arsenopyrite and pyrite in refractory ores: analytical refinements and new understanding of gold mineralogy M. BENZAAZOUA1,2,*, P. MARION1, F. ROBAUT3 AND A. PINTO4 1 Laboratoire Environnement et Minéralurgie, École Nationale Supérieure de Géologie, …
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1. Introduction. Arsenopyrite (FeAsS) and As-bearing pyrite (Fe(As,S)₂, with an As content of approximately 1–10 % m/m), are identified as the predominant As-bearing sulfide …
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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 …
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Gold occurs mostly as electrum in equilibrium with base metals sulfides filling fractures of pyrite and arsenopyrite. A novel combination of secondary ion mass spectrometry, laser ablation inductively coupled plasma mass spectrometry, and electron probe microanalysis is used to track the compositional evolution of ore fluid(s) and to ...
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Arsenopyrite and pyrite are the most common Au-bearing minerals in various Au deposits (Large et al., 2007;Bi et al., 2011;Cook et al., 2013). Major and trace elements in arsenopyrite and pyrite ...
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Pyrite has been used for various purposes throughout history due to its unique properties. Some of the main uses of pyrite include: Jewelry and Decorative Items: Pyrite's brassy-yellow to pale-gold color …
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Arsenopyrite Group. For possible Ni-analogue see Unnamed (Ni,Fe,Co)AsS; see also Unnamed (Ni Arsenide Sulphide).Arsenopyrite is closely related to alloclasite, but is not an exact analogue, because of different As-S and S-As ordering. Arsenopyrite may contain up to about 9 wt.% Co; with higher Co contents, glaucodot will appear as a separate phase …
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Pyrite has up to 0.12 wt.% Au, and arsenopyrite contains up to 0.17 wt.% Au. The antithetic correlation between S and As indicates the substitution of As for S in pyrite, and arsenic occurs in anionic As 1− state in the pyrite structure under the reduced conditions. Pyrite has relatively high Co (~364–2248 ppm) but relatively low Ni (~109 ...
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The As content of arsenopyrite and phase relationships of arsenian pyrite and arsenopyrite indicate that the formation temperature of euhedral arsenopyrite was …
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Pyrite has up to 0.12 wt.% Au, and arsenopyrite contains up to 0.17 wt.% Au. The antithetic correlation between S and As indicates the substitution of As for S in pyrite, and arsenic occurs in anionic As 1− state in the pyrite …
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XRD pattern of reacted sample in the system of single arsenopyrite showed no obvious changes compared with unreacted arsenopyrite. However, for reacted sample in the system of pyrite-arsenopyrite, the intensities of some main peaks corresponding to arsenopyrite significantly decreased (Fig. 2 a).In the FTIR spectra (Fig. 2 b), a peak of …
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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 brittle fracture. Gold expelled from the sulfide lattice during the remobilization event is ...
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Pyrite and arsenopyrite from Stage 2 veinlet mineralization both display porous and dissolution-reprecipitation textures, have low Au concentrations (<4 ppm and <78 ppm, respectively), and show a ...
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The open-circuit potential of pyrite or arsenopyrite is a corrosion potential. Presence of Au (super 3+) shifts the corrosion potential to a value that depends on the …
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Arsenian pyrite and arsenopyrite are recognized as the most important gold-bearing minerals in this deposit. Pyrites of different ore-forming stages have distinct features and element contents ...
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Moreover, a slightly negative correlation between the Au and Fe is observed in the compositions of Au-bearing pyrite and arsenopyrite crystals, and the Au/As values are below the solubility limit proposed in the literature. We favor a mechanism in which gold is removed from ore fluids by chemisorption at As-rich, Fe-deficient surface sites and ...
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Pyrite is the most common sulfide in the Earth. In the presence of arsenopyrite its oxidation is delayed, and instead, the arsenopyrite increases its oxidation rate, releasing As(III) and As(V) …
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The pyrite and arsenopyrite model mineral samples used in this study were obtained from GeoDiscoveries Australia. The chemical composition of the minerals using Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) is shown in Table 1.XRD analysis of the as …
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It is critical to study the surface properties of pyrite and arsenopyrite by oxidation and its effect on flotation behavior. The recovery of pyrite and arsenopyrite reduced with increasing pH but ...
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At the Deep Star gold deposit, Carlin Trend, Nevada, the sulfide compositions apparently span the full range of metastability from FeS 2 to near FeAsS (40 at% S); …
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The ore styles primarily comprise auriferous pyrite-arsenopyrite-quartz vein, disseminated pyrite-arsenopyrite-sericite-quartz mineralized slate, and intense mineralized slate breccia. The gold-bearing sulfide-quartz veins have average Au grades up to 13.5 g/t, generally higher than that of mineralized rock in all orebodies of 0.6–2.0 g/t and ...
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The Sunrise Dam gold mine (11.1 Moz Au) is the largest deposit in the Archaean Laverton Greenstone Belt (Eastern Goldfields Province, Yilgarn Craton, …
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In this paper, the galvanic effect of pyrite and arsenopyrite during the leaching pretreatment of gold ores was determined with the use of electrochemical testing (open circuit potential, linear ...
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This demonstrated that compared to pyrite, arsenopyrite had a substantially faster oxidation rate and a greater impact on flotation recovery. It can also be seen in the graph that the flotation difference between pyrite and arsenopyrite when unoxidised was 42.16 %, with the maximum flotation difference occurring at the 30 days of oxidation at ...
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The flotation concentrate consisted mainly of arsenopyrite and pyrite. Parameters for adapting the bacteria to arsenic(III) and catalyzing oxidation of sulfides with silver ion were also studied. The optimum conditions for efficient biooxidation were 10% culture inoculation, 5% pulp density, and a 10 mg/L silver ion catalyst in a pH=2 iron-free ...
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Pyrite is the most common sulfide in the Earth. In the presence of arsenopyrite its oxidation is delayed, and instead, the …
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