The Gold Mineralization of the Baranyevskoe Au-Ag Epithermal Deposit in Central Kamchatka

The Baranyevskoe Au-Ag epithermal deposit of low-sulfidation (LS) type is located on the Kamchatka Peninsula in the Neogene-Quaternary Central Kamchatka Volcanic Belt, where Au-bearing quartz veins are usually accompanied by veinlet stockworks. Two economic associations are typical of the Baranyevsk...

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Bibliographic Details
Published in:Minerals
Main Authors: Nadezhda Tolstykh, Daria Bukhanova, Maria Shapovalova, Andrey Borovikov, Maksim Podlipsky
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2021
Subjects:
Baranyevskoe deposit
LS epithermal deposit
gold-pyrite-quartz association
gold-sulfosalt-quartz association
Kamchatka Peninsula
Mineralogy
QE351-399.2
Kamchatka
Online Access:https://doi.org/10.3390/min11111225
https://doaj.org/article/7a7fd662ef9541ebbb0ea39c910dad1c
Description
Summary:The Baranyevskoe Au-Ag epithermal deposit of low-sulfidation (LS) type is located on the Kamchatka Peninsula in the Neogene-Quaternary Central Kamchatka Volcanic Belt, where Au-bearing quartz veins are usually accompanied by veinlet stockworks. Two economic associations are typical of the Baranyevskoe deposit. The first corresponds to gold-pyrite-quartz association with low-grade native gold (521–738‱) intergrown with pyrite. Some accessory Au-Ag minerals within the early association were also identified: acanthite AgS 2 , hessite AgTe 2 , lenaite Ag(Fe,Cu)S 2 , petzite Ag 3 AuTe 2 , utenbogardite Ag 3 AuS 2 and unnamed Ag-Sb-As sulfosalts. The former Au-Ag minerals were most likely formed in the temperature range of 320–330 °C based on the study of arsenopyrite thermometers and fluid inclusions. The second, a gold-sulfosalt-quartz association, includes high-grade native gold (883-941‱) in intergrowth with chalcopyrite. Cuprous phases (bornite, chalcocite, heerite, native copper, Cu-Zn solid solutions), Bi-rich sulfosalts (aikinite PbCuBiS 3 , emplectite CuBiS 2 , witticenite Cu 3 BiS 3 ), stannoidite Cu 8 Fe 3 Sn 2 S 12 , mawsonite Cu 6 Fe 2 SnS 8 ), Au-bearing galena, Te-free and Bi-rich tetrahedrite-tennantite represent this association. Fluid inclusions in gold-sulfosalt-quartz association are characterized by homogenization temperature ranging from 226 to 298 °C, and salinity from 0.4 to 1.2 wt. % NaCl eq.

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