Experimental constraints on gold and silver solubility in iron sulfides

Palyanova, Galina; Mikhlin, Yu. L.; Кох, К. А.; Карманов, Н. С.; Seryotkin, Yurii V.

doi:10.1016/j.jallcom.2015.07.131

Cited by 16 publications

(3 citation statements)

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“…3829, EPMA analysis). The compilation of these data with the concentrations described in the literature − is given in Figure . The content limit can be described by the following equation: lg ( C Ag , wt ⁡ % ) = prefix− 5.0 × ( 1000 / T ) + 5.1 …”

Section: Discussionmentioning

confidence: 99%

“…Since the system was not saturated with respect to Ag, no additional Agbearing phases were identified in association with pyrrhotite and magnetite. Au and Ag contents in pyrite FeS 2 , pyrrhotite Fe 1−x S, and troilite FeS were determined experimentally by Pal'yanova et al 14 The detected concentration of invisible Ag in pyrrhotite and pyrite synthesized at 500 °C was <0.03 wt % and that in troilite was 0.08 wt %. Microcrystals of Au−Ag alloys of 1−5 μm size were observed on the surfaces of iron sulfides.…”

Section: Introductionmentioning

confidence: 99%

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State of Ag in Pyrrhotite: Insights from X-ray Absorption Spectroscopy

Filimonova,

Wermeille,

Kvashnina

2023

ACS Earth Space Chem.

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Ag-bearing pyrrhotites Fe1–x S were synthesized by using the salt flux technique. The concentration of Ag in pyrrhotite reached 0.08 wt % at 540 °C and 1.3 wt % at 750–760 °C. The synthesized samples are divided into two groups according to the values of sulfur fugacity in the experimental system and the content of Fe (C Fe) in pyrrhotite. In group (i) at low sulfur fugacity (log f(S2) ≈ −6.5, C Fe > 48.8 at. %), Ag is disseminated in pyrrhotites in an “invisible” form but mostly concentrates on the grain boundaries of crystals as metallic rims. In group (ii) at high sulfur fugacity (log f(S2) ≈ −1.0, C Fe < 48.8 at. %), Ag occurs as an invisible form disseminated in the pyrrhotite matrix together with the minor form of Ag-bearing submicron inclusions. Analysis of Ag K-edge XAS spectra recorded at ambient temperature revealed that the samples of group (i) contain a small fraction of the invisible Ag+ form, while the majority of Ag presents in pyrrhotite crystals as Ag°. The samples of group (ii) at a temperature of 750 °C contain the invisible form of Ag–Ag2 +S-like clusters. The decrease in temperature leads to the partial decomposition of the invisible form and the appearance of the second (minor) form, Ag-bearing submicron inclusions. The predicted concentrations of Ag in pyrrhotite coincide with those from natural samples of various origins.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

State of Ag in Pyrrhotite: Insights from X-ray Absorption Spectroscopy

Filimonova,

Wermeille,

Kvashnina

2023

ACS Earth Space Chem.

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“…Experimental studies suggest pyrite may contain 240ppm and 300ppm Au and Ag respectively, contained within solid solution or as micro inclusions (Pal'Yanova et al, 2015), which is significantly more than may be incorporated into chalcopyrite. However, in the Ccp-Py zone 72% of Ag-and Au-bearing particles are hosted by chalcopyrite and only 19% by pyrite, while most microparticles in the Py>Ccp zone comprise Bi-or Hg-bearing minerals hosted by pyrite.…”

Section: Exsolutionmentioning

confidence: 99%

Precious and Critical Metal-Bearing Assemblages in the Ann Mason Copper Porphyry Deposit, Yerington, Nevada

Aird¹,

Purcell²,

Witt³

et al. 2021

Preprint

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Porphyry deposits are an important source of copper and their value may be upgraded by minor contents of precious metals, if they are extractable. The mechanisms for enrichment of precious and base metals in these systems are not well understood. This study investigates the deportment of trace metals in the Ann Mason porphyry deposit, including gold, silver, palladium, mercury, lead and bismuth. Petrographic and geochemical data are integrated to characterize the size and habit of minerals, the host mineral assemblages, and their association with alteration assemblages. Ann Mason is one of several ore deposits hosted by the Yerington batholith in Nevada, and is being assessed for copper extraction from bornite and chalcopyrite ore assemblages, associated with potassic alteration. Mineralization assemblages at Ann Mason have been categorized as chalcopyrite-bornite, chalcopyrite-pyrite and pyrite>chalcopyrite zones. Limited two-metre assay data indicates that gold is most closely associated with bornite, although it is found in all three mineralization zones. Analysis by SEM-EDS shows that trace elements are mostly present as microparticles hosted by sulfide minerals. Of the 438 grains measured, 89% are hosted by a sulfide mineral, with 68% hosted by bornite. Silver is most commonly present as hessite and gold as electrum, hosted by bornite and associated with potassic alteration. Palladium, mercury and bismuth are most commonly observed as telluride and selenide minerals. Palladium minerals are associated with potassic alteration, while mercury and bismuth minerals are mostly found with sericitic alteration. High fineness native gold is observed as three round blebs hosted by pyrite or silicates. Observations suggest that the trace metals in the chalcopyrite-bornite zone may have been incorporated by bornite and chalcopyrite, and exsolved upon cooling. In the chalcopyrite-pyrite and pyrite>chalcopyrite zones, the trace metals may have been deposited directly from a mineralizing hydrothermal fluid and incorporated into the growing sulphide minerals. These findings have implications for the paragenesis of porphyry deposits, as well as for the milling processes that would be needed to extract precious metals at the Ann Mason porphyry deposit.

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