Gold in the Oxidized Ores of the Olympiada Deposit (Eastern Siberia, Russia)
| Autor: | Andrey A. Savichev, A.M. Sazonov, Boris M. Lobastov, Sergey A. Silyanov, Yelena A. Zvyagina |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
mineral exploration
Supergene (geology) lcsh:QE351-399.2 010504 meteorology & atmospheric sciences Sulfide Hypogene Olympiada gold deposit Fracture (mineralogy) Geochemistry Yenisei Ridge engineering.material 010502 geochemistry & geophysics 01 natural sciences Aurostibite Hydrothermal circulation Metal Dissolution 0105 earth and related environmental sciences chemistry.chemical_classification lcsh:Mineralogy oxide ore Geology Geotechnical Engineering and Engineering Geology supergene gold chemistry visual_art weathering visual_art.visual_art_medium engineering |
| Zdroj: | Minerals, Vol 11, Iss 190, p 190 (2021) Minerals Volume 11 Issue 2 |
| ISSN: | 2075-163X |
| DOI: | 10.3390/min11020190 |
| Popis: | Native gold and its satellite minerals were studied throughout the 300 m section of oxidized ores of the Olympiada deposit (Eastern Siberia, Russia). Three zones are identified in the studied section: Upper Zone ~60 g/t Au Middle Zone ~3 g/t Au Lower Zone ~20 g/t Au. Supergene and hypogene native gold have been found in these zones. Supergene gold crystals (~1 μm), their aggregates and their globules (100 nm to 1 μm) predominate in the Upper and less in Middle Zone. Relic hypogene gold particles (flattened, fracture and irregular morphology) are sporadically distributed throughout the section. Spongiform gold occurs in the Lower Zone at the boundary with the bedrock, as well as in the bedrock. This gold formed in the process of oxidation of aurostibite, leaching of impurities and its further dissolution. Hypogene gold is commonly isolated but for supergene gold typically associated with ferric (hydr)oxides. New formation of gold occurred due to oxidation of sulfide ores and release of “invisible” gold, as well as dissolution, mobilization and re-deposition of metallic hypogene gold. A model for the formation of oxidized ores with the participation of meteoric and low-temperature hydrothermal waters has been proposed. |
| Databáze: | OpenAIRE |
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