DBPapers
DOI: 10.5593/SGEM2015/B11/S1.066

VERKHNENIYAYUSKOE-2 GOLD-SULFIDE DEPOSIT IN POLAR URALS, RUSSIA: ORE MINERALOGY AND FORMATION CONDITIONS

S. Kuznetsov, T. Mayorova, N. Sokerina, V. Philippov
Tuesday 4 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-31-5 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 1, 521-528 pp

ABSTRACT
The Verkhneniyayus 2 deposit is located in acid and basic effusions of the Later Riphean Bedamel suite. Sulphide-quartz veins and zones of streak-impregnated sulphide mineralization, overlying the enclosing rocks, occur throughout the deposit. Pyrite, arsenopyrite, galenite, chalcopyrite, and sphalerite are the major minerals. Rare mineral phases such as giessenite, freibergite, aurostibite, and natural bismuth present there. Gold is observed as impurities in sulphides or as growths with them. Silver and mercury are the main elements-impurities in gold. Two stages of ore genesis are distinguished: an earlier gold-pyrite-arsenopyrite level and a later gold-galenite-chalcopyrite-sphalerite one. Ore veins formation fell within the interval ca. 400-80oC. The isotopic composition of S in sulphides indicates the connection of ore-forming fluids with magmatic processes.

Keywords: gold sulfide type, ore mineralogy, gold content, ore formation conditions, Polar Urals.

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