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Mineralogy and Petrology

, Volume 109, Issue 5, pp 649–657 | Cite as

Gold and palladium minerals (including empirical PdCuBiSe3) from the former Roter Bär mine, St. Andreasberg, Harz Mountains, Germany: a result of low-temperature, oxidising fluid overprint

  • Alexandre Raphael CabralEmail author
  • Wilfried Ließmann
  • Bernd Lehmann
Short Communication

Abstract

At Roter Bär, a former underground mine in the polymetallic deposits of St. Andreasberg in the middle-Harz vein district, Germany, native gold and palladium minerals occur very locally in clausthalite–hematite pockets of few millimetres across in carbonate veinlets. The native gold is a Au–Ag intermetallic compound and the palladium minerals are characterised as mertieite-II [Pd8(Sb,As)3] and empirical PdCuBiSe3 with some S. The latter coexists with bohdanowiczite (AgBiSe2), a mineral that is stable below 120 °C. The geological setting of Roter Bär, underneath a post-Variscan unconformity, and its hematite–selenide–gold association suggest that oxidising hydrothermal brines of low temperature were instrumental to the Au–Pd mineralisation. The Roter Bär Au–Pd mineralisation can be explained by Permo-Triassic, red-bed-derived brines in the context of post-Variscan, unconformity-related fluid overprint.

Keywords

Hematite Selenide Bi2Se3 Native Gold Cu2Se 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

ARC gratefully acknowledges VALE S.A. for funding his stay in Germany. This study was supported by the German BMBF cooperative project “r4 - Wirtschaftsstrategische Rohstoffe: ResErVar/Harz”. Reviews by Kari Kojonen and Fernando Gervilla are sincerely appreciated.

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Copyright information

© Springer-Verlag Wien 2015

Authors and Affiliations

  • Alexandre Raphael Cabral
    • 1
    Email author
  • Wilfried Ließmann
    • 2
  • Bernd Lehmann
    • 1
  1. 1.Mineral Deposits, Technische Universität ClausthalClausthal-ZellerfeldGermany
  2. 2.Lehrbergwerk Grube Roter Bär Sankt AndreasbergGöttingenGermany

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