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High-Sulfidation Epithermal Gold Deposit at Klokoč - Podpolom

By
Jaroslav Štohl
Jaroslav Štohl
GSSR geologist — emeritus, Ambrova ul. 28, 831 01 Bratislava, Slovakia
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Eva Žáková
Eva Žáková
Geological Survey of Slovak Republic, Mlynská dol. 1, 817 04 Bratislava, Slovakia
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Jaroslav Lexa
Jaroslav Lexa
Geological Survey of Slovak Republic, Mlynská dol. 1, 817 04 Bratislava, Slovakia
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Published:
January 01, 1999

Abstract

The paleohydrothermal systems in the central zone of the Javorie stratovolcano are represented at the surface by conspicuous outcrops of secondary quartzites (residual quartz) and much less conspicuous argillized rocks. These zones of advanced argillic alteration were assumed during the early seventies to reflect porphyry copper systems at depth. Subsequent drilling at Banisko (Konecný et al., 1997), and a systematic metallogenetic survey in the central zone of the Javorie stratovolcano (Štohl at al., 1981) confirmed this assumption and provided extensive information concerning the geology, mineralogy, geochemistry and geophysics of this area. The next stage of metallogenetic investigation (Štohl et al., 1985, 1986) was then devoted to the detailed study of individual hydrothermal systems. Geochemical sampling as well as drilling was used to explore for a possible enargite-type Cu mineralization; with the exception of a few occurrences the results were negative. Nobody was aware of the possibility for gold potential at that time. In addition, gold was not analyzed for since sufficiently sensitive analytical methods were not available to carry out systematic gold geochemistry.

In the early nineties the advanced argillic zones of alteration were recognized to represent high-sulfidation epithermal systems with a possible gold potential. In February, 1996, Rhodes mining company began to explore the area. Portions of drill cores from the preceding exploration campaign which were enriched in pyrite were sampled and analyzed for gold; however, the results were mostly negative, with only two samples showing values close to 1 g/t. The discovery of gold mineralization at Klokoc —

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Contents

Society of Economic Geologists Guidebook Series

Epithermal Mineralization of the Western Carpathians

Ferenc Molnár
Ferenc Molnár
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Jaroslav Lexa
Jaroslav Lexa
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Jeffrey W. Hedenquist
Jeffrey W. Hedenquist
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Society of Economic Geologists
Volume
31
ISBN electronic:
9781934969847
Publication date:
January 01, 1999

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