Visible and “invisible” forms of gold and silver in the crystallization products of melts in the Fe–S–Ag–Au system: experimental data


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Abstract

The forms of Au and Ag occurrence in the crystallization products of melts in the Fe–S–Ag–Au system depending on the proportions of Fe/S and Ag/Au have been studied at (Fe + S)/(Ag + Au) = 0.1. It is shown that the S-rich systems with S/Fe = 2 contain Au–Ag sulfides and Au–Ag alloys. The systems depleted in S with S/Fe = 1 contain only Au–Ag alloys. The results of XPS provide evidence for the sulfide and metallic components of Au and Ag among the crystallization products of melts in the system studied at S/Fe = 2 and a metallic component with S/Fe = 1. According to the data of electron microprobe analysis, the content of “invisible” forms of noble metals in pyrite and pyrrhotite is < 0.024 wt % for Au and <0.030 wt % for Ag; the contents of “invisible” Au and Ag in troilites are 0.040 ± 0.013 wt % Au and 0.079 ± 0.016 wt % Ag.

About the authors

G. A. Palyanova

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Author for correspondence.
Email: palyan@igm.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk

Yu. L. Mikhlin

Institute of Chemistry and Chemical Technology, Siberian Branch

Email: palyan@igm.nsc.ru
Russian Federation, Krasnoyarsk

N. S. Karmanov

Sobolev Institute of Geology and Mineralogy, Siberian Branch

Email: palyan@igm.nsc.ru
Russian Federation, Novosibirsk

K. A. Kokh

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: palyan@igm.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk

Yu. V. Seryotkin

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: palyan@igm.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk

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