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Book Chapter

The Šobov High-Sulfidation System

By
Jaroslav Lexa
Jaroslav Lexa
Geological Survey of Slovak Republic, Mlýnská dol. 1, 817 04 Bratislava, Slovakia
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Jaroslav Štohl
Jaroslav Štohl
GSSR geologist — emeritus, Stromová ul., 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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Published:
January 01, 1999

Abstract

The Šobov high-sulfidation epithermal deposit is 2 km north of Banská Štiavnica, and formed from the oldest hydrothermal system of the Štiavnica stratovolcano. Its metasomatic quartzite core is quarried from an open pit as the raw material for production of refractory bricks in a nearby factory. Exploration by drilling and underground galleries proved reserves of 6.2 million tons of 96 — 97 % SiO2, 1–1,5% Fe2O3, 0.2 – 0.3 % A12O3 and 0.7–1.1% TiO2 (Polák, 1960). At present the industrial reserves of the deposit are 5.3 million tons at 97.8 % SiO2, 0.6% Fe2O3 and 0.84% Al2O3 + TiO2 (Balances of reserves at exclusive mineral deposits of Slovakia, 1996). Local accumulations of agalmatolite (nowadays pyrophyllite) and dillnite (nowadays zunyite) in karstic cavities of adjacent carbonate rocks on the northern side of the deposit were exploited during the 19th century. Exploitation of the deposit since the early 1960s has eventually created environmental problems owing to dumping of pyrite-rich argillic-altered rock on large heaps and subsequent weathering. The immediate risk has been reduced by a drainage system, which takes acid waters to abandoned mines, where they are diluted by ground waters.

The quartzite of the deposit has been for a long time a matter of disputes, being variably interpreted as sedimentary Triassic quartzite affected by recrystallization (e.g., Lipoid, 1867; Szabó, 1891), or hydrothermal metasomatic quartzite (e.g., Böckh, 1901). The hydrothermal origin was accepted also by Polák (1960), who conducted detailed exploration by drilling and galleries to calculate the reserves for future exploitation.

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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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