Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2021

Идентификатор DOI: 10.3390/min11020190

Ключевые слова: mineral exploration, olympiada gold deposit, oxide ore, supergene gold, weathering, yenisei ridge

Аннотация: 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 aggre-gates 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 bed-rock, 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. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Журнал: Minerals

Выпуск журнала: Vol. 11, Is. 2

Номера страниц: 1-21

ISSN журнала: 2075163X

Издатель: MDPI AG

• Silyanov Sergey A. (Siberian Fed Univ, Inst Min Geol & Geotechnol, 79 Pr Svobodny, Krasnoyarsk 660041, Russia)
• Sazonov Anatoly M. (Siberian Fed Univ, Inst Min Geol & Geotechnol, 79 Pr Svobodny, Krasnoyarsk 660041, Russia)
• Zvyagina Yelena A. (Siberian Fed Univ, Inst Min Geol & Geotechnol, 79 Pr Svobodny, Krasnoyarsk 660041, Russia)
• Savichev Andrey A. (St Petersburg Min Univ, Dept Mineral Crystallog & Petrog, 2 21st Line, St Petersburg 199106, Russia; LLC Norilskgeologia, 11 Grazhdanskiy Ave, St Petersburg 195220, Russia)
• Lobastov Boris M. (Siberian Fed Univ, Inst Min Geol & Geotechnol, 79 Pr Svobodny, Krasnoyarsk 660041, Russia)

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