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arsenian pyrite

A proposed new type of arsenian pyrite: Composition ...

Arsenian pyrite of the As 1− type in other ore deposits commonly forms overgrowths that are 5–40 μm wide (e.g., Simon et al., 1999b, Hofstra and Cline, 2000, Emsbo et al., 2003), whereas overgrowths of As 3+-type arsenian pyrite at Yanacocha are 20–100 μm …

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A proposed new type of arsenian pyrite: Composition ...

Arsenian pyrite is the major host mineral of gold in Carlin type gold deposit (CTGD) and forms during the interaction of H2S bearing hydrothermal fluids with Fe-bearing carbonates (e.g., siderite ...

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Abstract: A POSSIBLE EXPLANATION FOR THE CORRELATION OF ...

 · Invisible gold is a type of gold ore that consists of micrometer-sized blebs of native gold and structurally bound gold in iron sulfides, most commonly pyrite, arsenian pyrite and arsenopyrite, in hydrothermal-type gold deposits. Increasing arsenic concentrations often correlate with increasing gold concentrations in natural samples.

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Behaviour of trace elements in arsenian pyrite in ore ...

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 manner similar to that previously reported for Au ...

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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 As-poor pyrite.

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Solubility of gold in arsenian pyrite - ScienceDirect

In Carlin-type deposits, where arsenian pyrite has been studied most intensively, a compilation of previously published Au-As SIMS and EMPA analyses shows that almost all data points fall within a wedge-shaped zone in log (Au)–log (As) space, which is limited by a relatively sharp boundary.Although available information on the chemical state of Au in arsenian pyrite is limited, the ...

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Gold-bearing arsenian pyrite and marcasite and ...

thetic pyrite from chemical analysis and unit-cell spacing, but no details are available and his experiments have not been repeated with modern analytical procedures. We presently report on Au-bearing arsenian pyrite and marcasite and arsenopyrite from Carlin Trend deposits, Nevada, and from laboratory synthesis. The study further

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Constraints on the solid solubility of Hg, Tl, and Cd in ...

Abstract. Arsenic-rich (arsenian) pyrite can contain up to tens of thousands of parts per million (ppm) of toxic heavy metals such as Hg, Tl, and Cd, although few …

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Pyrite Mineral Data

Visit our Advertisers for Pyrite : Adam's Minerals Google Search for Pyrite Dakota Matrix Minerals Google Search for Pyrite John Betts Fine Minerals Search for Pyrite McDougall Minerals Google Search for Pyrite Rock and Mineral Shows Google Search for Pyrite Weinrich Minerals, Inc. Google Search for Pyrite. Ask about Pyrite here :

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Legacy of the California Gold Rush: Environmental ...

Arsenic in outcrops and waste rock occurs in arsenian pyrite containing an average of 2 wt% arsenic. Arsenic is concentrated up to 1300 ppm in fine-grained, friable iron-rich weathering products of the arsenian pyrite (goethite, jarosite, copiapite), which develop as …

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Mineralogy and geochemistry of gold-bearing arsenian ...

 · 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.

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Pyrite - Wikipedia

Pyrite's metallic luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fool's gold. The color has also led to the nicknames brass, brazzle, and Brazil, primarily used to refer to pyrite found in coal.

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Thallian Arsenian Pyrite: Mineral information, data and ...

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. Baogui Zhang, Sanxue Wang, Zhong Zhang, and Mingzai Wang (1998): A study on thallium pyrite, (Fe,Tl)(S,As)2, discovered in Nanhua Tl-As deposit in China. Acta ...

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Washington State Minerals Checklist

Arsenian pyrite Arsenic Arseniosiderite Arsenolite Arsenopalladinite Arsenopyrite Arsenosulvanite Arsenpolybasite Astrophyllite Atacamite Atokite Augite Aurostibite Austinite Autunite Awaruite Axinite group Azurite Barite Bastnäsite Bastnäsite-Ce Beaverite Beidellite Bementite Benavidesite Bentonite (Montmorillonite) Berthierite ...

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Pyrite - Wikipedia

Pyrite's metallic luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fool's gold. The color has also led to the nicknames brass, brazzle, and Brazil, primarily used to refer to pyrite found in coal.

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ARSENIAN PYRITE: THE MOST IMPORTANT SOLID ARSENIC …

By excluding arsenian pyrite from consideration in geochemical modeling effectively assumes that the phase is not stable, which runs counter to published data on its importance in reducing groundwater. What is needed is new (experimental) thermodynamic data for various compositions of arsenian pyrite for meaningful prediction.

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ENVIRONMENTAL GEOCHEMISTRY OF ARSENIC AND ITS ...

Arsenian Pyrite Somewhat mobile under sulfate -reducing conditions if iron content is low, H. 2. S elevated; e.g., As -combines with H. 2. S to make aqueous species and perhaps amorph . AsS ("realgar"), As. 2. S. 3 ("orpiment") although the As -S phases DO NOT remove enough As from ground water to be meet DWS or clean up goals in USA

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Arsenian Pyrite Formation: Solid-State Diffusion or ...

The formation of arsenian pyrite has been studied experimentally by hydrothermal reactions of either pyrite or pyrrhotite with arsenic-bearing fluids. Both pyrite and pyrrhotite were transformed to arsenian pyrite retaining the overall morphology of the starting grains …

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Invisible gold in arsenian pyrite from the high-grade ...

Invisible gold in arsenian pyrite from the high-grade Hishikari gold deposit, Japan: Significance of variation and distribution of Au/As ratios in pyrite Yuichi Morishita *, Nobutaka Shimada, Kazuhiko Shimadac a Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan

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Pyrite (Marcasite) ~ Learning Geology

Despite being nicknamed fool's gold, pyrite is sometimes found in association with small quantities of gold. Gold and arsenic occur as a coupled substitution in the pyrite structure. In the Carlin–type gold deposits, arsenian pyrite contains up to 0.37 wt% gold.

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