Mineralogy and geochemistry of gold-bearing arsenian pyrite …
Arsenian pyrite in the Shuiyindong Carlin-type gold deposit in Guizhou, China, is the major host for gold with 300 to 4,000 ppm Au and 0.65 to 14.1 wt.% As. Electron miroprobe data show a negative correlation of As and S in arsenian pyrite, which is consistent with the substitution of As for S in the pyrite structure. The relatively …
EVOLUTION OF INVISIBLE Au IN ARSENIAN PYRITE IN …
A significant characteristic distinguishing Carlin-type Au deposits from other Au deposits is the abundance of invisible Au in arsenian pyrite. Gold occurs primarily as ionic Au1+ in arsenian pyrite and is unstable during subsequent thermal events. In this study, we used the focused ion beam combined with scanning electron microscope (FIB …
Arsenic-bearing Pyrite: Mineral information, data and localities.
Formula: FeS2. Elements listed: Fe, S - search for minerals with similar chemistry. Synonyms of Arsenic-bearing Pyrite Hide. Arsenian Pyrite. Other Language Names for …
[PDF] Release and re-enrichment of invisible gold in arsenian pyrite …
The mechanisms responsible for invisible gold enrichment driven by coupled dissolution-reprecipitation reaction (CDR) are debated. Here we report the micro- to nano-scale textures of arsenian pyrite in a high-grade (>10 g/t) gold ore from the Chang'an deposit to trace the gold enrichment process. Our study records a CDR-driven evolution of mineral …
A proposed new type of arsenian pyrite: Composition, …
Arsenian pyrite in the Shuiyindong Carlin-type gold deposit in Guizhou, China, is the major host for gold with 300 to 4,000 ppm Au and 0.65 to 14.1 wt.% As. Electron miroprobe data show a negative …
SEM and FIB-TEM analyses on nanoparticulate arsenian …
We propose that nanoparticulate arsenian pyrite attachment and aggregation is the main mechanism for the arsenian pyrite rim growth, and such mechanism is …
Partitioning of arsenic between hydrothermal fluid and pyrite …
Arsenian pyrite is the major host mineral of gold in Carlin type gold deposit (CTGD) and forms during the interaction of H 2 S bearing hydrothermal fluids with Fe-bearing carbonates (e.g., siderite, ankerite, Fe-rich dolomite) in the wall rock. Experimental replacement of siderite at hydrothermal conditions (i.e., 200 °C, Psat) was used to study …
Arsenic-bearing Pyrite: Mineral information, data and localities.
Voudouris P, Kati M, Magganas A, Keith M, Valsami-Jones E, Haase K, Klemd R, Nestmeyer M (2021) Arsenian Pyrite and Cinnabar from Active Submarine Nearshore Vents, Paleochori Bay, Milos Island, Greece. Minerals, 11, 14. DOI: 10.3390/min11010014
A proposed new type of arsenian pyrite: Composition, …
This report describes a new form of arsenian pyrite, called As 3+-pyrite, in which As substitutes for Fe [(Fe,As)S 2], in contrast to the more common form of …
Invisible gold in arsenian pyrite and arsenopyrite from a …
The LA-ICP-MS data in this study indicate that arsenian pyrite and arsenopyrite in the Sunrise Dam deposit incorporate significant amounts of refractory …
Oxidation state of gold and arsenic in gold-bearing arsenian pyrite
XANES measurements on gold-bearing arsenian pyrite from the Twin Creeks Carlin-type gold deposits show that gold is present as both Au 0 and Au I+ and arsenic is present at As I- . Au 0 is attributed to sub-micrometer size inclusions of free gold, whereas Au I+ is attributed to gold in the lattice of the arsenian pyrite. STEM observations …
Gold-bearing arsenian pyrite and marcasite and
Invisible gold in natural and synthetic arsenian pyrite and marcasite correlates with anomalous As content and Fe deficiency, and high contents of invisible gold in most natural and all synthetic arsenopyrite correlate with excess As and Fe deficiency. As-rich, Fe-de-ficient arsenopyrite synthesized hydrothermally contains up to 3.0 wt% Au ...
Arsenian pyrite from gold deposits; Au and As distribution …
Arsenian pyrite in the Shuiyindong Carlin-type gold deposit in Guizhou, China, is the major host for gold with 300 to 4,000 ppm Au and 0.65 to 14.1 wt.% As. Electron miroprobe data show a negative …
Phase relations of arsenian pyrite and arsenopyrite
20 Arsenian pyrite containing above 1 wt. % As plays a crucial role in deposition and deportment of Au 21 and other chalcophile elements. The importance of arsenian pyrite …
Behaviour of trace elements in arsenian pyrite in ore deposits
As-bearing pyrite is one of the main hosts for Au and other trace elements in epithermal, Carlin and mesothermal (orogenic) Au deposits. A review of our own and published SIMS, EMPA, LA-ICP-MS and PIXE analyses of pyrite from these deposits suggests that the solubility of Ag, Te, Hg, Sb and Pb in arsenian pyrite is controlled by As-content in a …
Phase relations of arsenian pyrite and arsenopyrite
Given the importance of arsenian pyrite, this study reviews the previous studies and discusses different scenarios of the relationship between equilibrium pyrite …
A proposed new type of arsenian pyrite: Composition
A ternary plot of the arsenian pyrite Fe-S-As (at %) can prove whether As replaces S or Fe [49,53], a trend line parallel to the As-S contents distribution as defined in the Fe-S-As (at%) ternary ...
Oxidation state of gold and arsenic in gold-bearing arsenian pyrite
XANES measurements on gold-bearing arsenian pyrite from the Twin Creeks Carlin-type gold deposits show that gold is present as both Au 0 and Au (super I+) and arsenic is present at As (super I-) . Au 0 is attributed to sub-micrometer size inclusions of free gold, whereas Au (super I+) is attributed to gold in the lattice of the arsenian …
Nanoscale "liquid" inclusions of As-Fe-S in arsenian pyrite
A new mode of arsenic incorporation into arsenian pyrite has been discovered. Electron microprobe analyses and elemental maps of arsenian pyrite from Pueblo Viejo, Dominican Republic, show that its chemical composition varies from (Fe 0.998 As 0.003) 1.001 S 2 to (Fe 0.963 As 0.050 Cu 0.003 Ag 0.001) 1.017 S 2 and that …
EVOLUTION OF INVISIBLE Au IN ARSENIAN PYRITE IN
A significant characteristic distinguishing Carlin-type Au deposits from other Au deposits is the abundance of invisible Au in arsenian pyrite. Gold occurs primarily as ionic Au 1+ in arsenian pyrite and is unstable during subsequent thermal events. In this study, we used the focused ion beam combined with scanning electron microscope (FIB …
The nature and partitioning of invisible gold in the pyrite …
Similar sorption capacities of pyrite vis-à-vis As(III) in aqueous solution were recently reported in siderite-to-pyrite replacement experiments at 200 °C with As contents in pyrite reaching ∼10,000 ppm (Kusebauch et al., 2018), and independently by thermodynamic models of arsenian pyrite - fluid interactions at hydrothermal conditions ...
Visible gold in arsenian pyrite at the Shuiyindong Carlin …
1.. IntroductionCarlin-type gold deposits, which are among the largest hydrothermal gold deposits in the world (Kesler et al., 2005), are best known for the scarcity of visible gold in their ores (Simon et al., 1999a).Numerous studies have shown that the majority of the gold resides in disseminated arsenian pyrite that precipitated from H 2 S …
Solubility of gold in arsenian pyrite | Request PDF
Along the same line, the limiting concentration of gold in arsenian pyrite was determined and expressed as c Au = 0.02 × c As + 4 × 10 -5 (Reich and Becker 2006; Reich et al. 2005). A maximum Au ...
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 tailings.
(PDF) Gold deposition onto arsenian pyrite
Santiago, Chile ([email protected]) Arsenian pyrite is widely known for its dual role as an. important host for "invisible" gold in ore deposits, and a. major source of arsenic and heavy ...
[PDF] Solubility of gold in arsenian pyrite | Semantic Scholar
Gold and Arsenopyrite Exsolution and Limits of Arsenic Solubility in Pyrite Investigated by SEM, EPMA, and L-ICPMS. The mineral pyrite (Py, FeS2) is an important carrier of gold in ore deposits, both as solid solution in the pyrite lattice ("invisible gold"), as well as in form of gold inclusions in Py ("free….
Stability, Structure, and Electronic Properties of …
Arsenian pyrite is confirmed as the most important gold-hosting mineral and four types of gold-bearing arsenian pyrite are recognized. Among these four types, the lowest amt. of gold and arsenic …
Investigating the selective flotation of auriferous arsenian pyrite
Thus, a much more complex mineralogical occurrence between arsenian pyrite and other sulphides, such as rims or extremely fine intergrowth could be expected. It was theorised that at the tested grind size of P 80 75 μm, well liberated pyrite and arsenian pyrite particles in the feed would be achieved. Download : Download high-res image …
Invisible gold in arsenian pyrite and arsenopyrite from a …
The Au content of arsenian pyrite and arsenopyrite from four mineralizing stages (D1, D3, D4a, and D4b) and from different structural and lithostratigraphic environments was measured using in situ laser ablation inductively coupled plasma mass spectrometry. Pyrite contains up to 3,067 ppm Au (n = 224), whereas arsenopyrite …
Gold nanoparticles in aresenian pyrite from a Carlin-type …
The gold nanoparticles are dispersed throughout arsenian pyrite rims (1-10 mm thick, up to 10 wt% As), which have overgrown diagenetic As-poor pyrite. The gold nanoparticles are concentrated throughout arsenic-rich pyrite (up to 1 vol% Au, equivalent to 3 wt% Au estimated from HAADF-STEM images), but are not observed in associated …
SEM and FIB-TEM analyses on nanoparticulate arsenian pyrite
The results indicate that the arsenian pyrite rim is composed of numerous nanoparticulate pyrite grains (rather than a single crystal), and gold nanoparticles (Au 0) occur mainly in sub-rim with the highest Au content, which are porous and have lower degrees of order. We propose that nanoparticulate arsenian pyrite attachment and …
Phase relations of arsenian pyrite and arsenopyrite
Gold-bearing arsenian pyrite and marcasite and arsenopyrite from Carlin Trend gold deposits and laboratory synthesis. Abstract Invisible gold in natural and synthetic arsenian pyrite and marcasite correlates with anomalous As content and Fe deficiency, and high contents of invisible gold in most natural and all….
An XPS study on the valence states of arsenic in arsenian pyrite
1. Introduction. Arsenic-rich pyrite, namely arsenian pyrite, is widely known for its dual role as an important host for gold in ore deposits and a major source of arsenic and other heavy metals environmental pollution (Nesbitt et al., 1995, Savage et al., 2000, Sidle et al., 2001, Benzaazoua et al., 2004, Morin and Calas, 2006, O'day, 2006, Lowers …
Oxidation state of gold and arsenic in gold-bearing arsenian pyrite
Abstract XANES measurements on gold-bearing arsenian pyrite from the Twin Creeks Carlin-type gold deposits show that gold is present as both Au0 and AuI+ and arsenic is present at AsI-. Au0 is attributed to sub-micrometer size inclusions of free gold, whereas AuI+ is attributed to gold in the lattice of the arsenian pyrite. STEM observations …
Behaviour of trace elements in arsenian pyrite in ore …
arsenian pyrite at nanoscale levels have been discussed by Palenik et al. (2004) and Reich et al. (2005). New HAADF-STEM and HRTEM observations reveal that some of the trace elements in arsenian ...
Arsenic incorporation into FeS2 pyrite and its
For the arsenian pyrite, the substitution induces an expansion of the unit cell proportional to the arsenic concentration. The supercells Fe 32 S 63 As and Fe 32 S 62 As 2 correspond to arsenic concentrations of 1.9 and 3.8 wt%, respectively, and display expansions of 0.45% and 0.83% in volume relative to the calculated values for pure pyrite.
- extraction de la pyrite et traitement de l or
- séparation du minerai de pyrite
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