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A unique ore-placer area of the Amur region with high-Hg gold

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Abstract

This work presents the geological structure and a description of the gold-ore occurrences and gold placers of the Un’ya-Bom ore-placer cluster of the Amur gold-bearing province. The host rocks are Late Paleozoic and Mesozoic black shales. Intrusive formations occur rarely. The sublatitudinal Un’ya Thrust is the principal ore-controlling structure. Paleozoic sandstones are thrust over Mesozoic flysch deposits along the Un’ya Thrust. The gold-ore occurrences are represented by quartz-vein zones. The ores are gold–quartz, low-sulfide. Ore minerals are arsenopyrite, scheelite, ferberite, galena, and native gold. High-Hg native gold was revealed in the ore occurrences and placers. The high Hg content in native gold is explained by the presence of the frontal part of the gold-bearing column located within the cluster; the rich placers were formed due to crushing of this column.

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Authors and Affiliations

  1. Institute of Geology and Natural Management, Far East Branch, Russian Academy of Sciences, Blagoveschensk, Amur Region, 675000, Russia

    A. V. Melnikov & V. G. Moiseenko

  2. Scientific Research Geotechnological Center, Far East Branch, Russian Academy of Sciences, Petropavlovsk-Kamchatsky, 683002, Russia

    V. A. Stepanov

Authors
  1. A. V. Melnikov
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  2. V. A. Stepanov
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  3. V. G. Moiseenko
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Corresponding author

Correspondence to A. V. Melnikov.

Additional information

Original Russian Text © A.V. Melnikov, V.A. Stepanov, V.G. Moiseenko, 2017, published in Doklady Akademii Nauk, 2017, Vol. 476, No. 6, pp. 660–664.

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Melnikov, A.V., Stepanov, V.A. & Moiseenko, V.G. A unique ore-placer area of the Amur region with high-Hg gold. Dokl. Earth Sc. 476, 1134–1137 (2017). https://doi.org/10.1134/S1028334X17100245

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  • DOI: https://doi.org/10.1134/S1028334X17100245

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