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Selenium-Rich Ag–Au Mineralization at the Kremnica Au–Ag Epithermal Deposit, Slovak Republic

Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, Prague 9, 193 00 Horní Počernice, Czech Republic
UK Mining Ventures Ltd., No. 1, The Old Coach Yard, East Coker; Somerset BA22 9HY, UK
Mining Museum Příbram, Hynka Kličky Place 293, Příbram VI, 261 01 Březové Hory, Czech Republic
Author to whom correspondence should be addressed.
Minerals 2018, 8(12), 572;
Received: 19 October 2018 / Revised: 30 November 2018 / Accepted: 1 December 2018 / Published: 4 December 2018
(This article belongs to the Section Crystallography and Physical Chemistry of Minerals)
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Selenium-rich Au–Ag mineralization has been discovered in the Kremnica ore district, central Slovakia. The mineralization is hosted by a single quartz–dolomite vein hosted by Neogene propyllitized andesites of the Kremnica stratovolcano. Ore mineralogy and crystal chemistry of individual ore minerals have been studied here. The early base-metal ore mineralization composed of pyrite, sphalerite, and chalcopyrite lacks selenium, whereas the superimposed Au–Ag paragenesis is Se-enriched. The Au–Ag alloys, uytenbogaardtite, minerals of the galena–clausthalite series, acanthite–naumannite series, diaphorite, miargyrite, pyrargyrite–proustite, polybasite group, minerals of the tetrahedrite group and andorite branch (andorite IV, andorite VI, Ag-excess fizélyite), freieslebenite, and rare Pb–Sb sulphosalts (scaiinite, robinsonite, plagionite) have been identified here. Besides selenides, the most Se-enriched phases are miargyrite, proustite–pyrargyrite, and polybasite–pearceite, whose Se contents are among the highest reported worldwide. In addition, one new phase has been found, corresponding to a Se-analogue of pearceite containing 2.08–3.54 apfu Se. The style of mineralization, paragenetic situation, and chemical trends observed in individual minerals are comparable to those of Au–Ag low-sulphidation epithermal Au–Ag mineralizations of the Kremnica and neighboring Štiavnica and Hodruša-Hámre ore districts. However, the pronounced enrichment in selenium is a specific feature of the studied vein only. View Full-Text
Keywords: Au–Ag low-sulphidation epithermal mineralization; Kremnica; gold; selenides; Ag sulphoslats Au–Ag low-sulphidation epithermal mineralization; Kremnica; gold; selenides; Ag sulphoslats

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Števko, M.; Sejkora, J.; Dolníček, Z.; Škácha, P. Selenium-Rich Ag–Au Mineralization at the Kremnica Au–Ag Epithermal Deposit, Slovak Republic. Minerals 2018, 8, 572.

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