Multiple Stages of Mineralization at the Rozália Mine, Hodruša
Jaroslav Lexa, Peter Koděra, Ján Prcúch, Michal Veselý, Jozef Šály, 1999. "Multiple Stages of Mineralization at the Rozália Mine, Hodruša", Epithermal Mineralization of the Western Carpathians, Ferenc Molnár, Jaroslav Lexa, Jeffrey W. Hedenquist
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The Rozália mine is one of the youngest in the Štiavnica-Hodruša ore district. The mine was operated by the state company Rudné Bane until 1992, and since 1994 by the private company Slovenská Banská, s.r.o. Interestingly, three different types of ore have been extracted successively during the existence of this mine. Initial steps to mine Cu ores of the Rozália vein were taken in the year 1939; however, the war interrupted mining until 1948. Exploitation was finally restarted in 1951. In total 1,864,000 tons of copper ore was produced through 1990 with an average Cu content of 0.74 wt% (Fajbík, 1997). The vein was developed and exploited down to the 14th level (+230 m above sea level, corresponding to a depth of 350 to 400 m below the surface). After exhaustion of the Cu ores of the Rozália vein, the richest parts of the stockwork and disseminated base-metal ores, located in the hanging wall of the Rozália vein on the 8 to 10th levels, were exploited in 1991 — 1992. According to Kana (1997) from 1. 11. 1990 through 31. 12. 1991 a total of 62,137 tons of ore was mined with an average metal concentration of 1.31 % Pb, 1.59 % Zn and 0.34 % Cu. In January, 1992, underground exploration of newly discovered gold mineralization was started on the 14th level of the Rozália mine. Exploration work was successful (Šály and Kámen, 1992; Šály et al., 1994) and exploitation began in 1993 and is still in progress. Today
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Epithermal Mineralization of the Western Carpathians
km 0 The first Shell gas station on the M3 motorway after the end of Budapest sign. From here, the M3 motorway crosses the Gödöllő Hills during the next 35–40 kilometers. This area consists of a 2 km thick Tertiary-Quaternary sedimentary sequence underlain by Mesosoic carbonate rocks. On the present surface, loess from the Pleistocene glaciation and drift sand deposits are the most common sediments.
60 On the left side ahead the first view of the Western Mátra Mtns. appears. They are the highest mountains of Hungary with 1014 m elevation at the Kékes summit. The visible part of the Western Mátra Mts. is composed of Miocene andesitic-rhyolitic rocks forming a caldera structure with approximately 15 km diameter. The Mátra Mtns. is the object of the field programme on the fourth day and details of regional geology can be found in the guidebook. In front of the mountains the town of Gyöngyős can also be seen.
69 The M3 motorway crosses one of the traditional wine-producing area of Hungary. The vineyards covering 28 000 acres on the southern foreland of the Mátra Mts. are famous for various white vines. The center of the wine region is Gyöngyős.
Behind the vineyards to the left (north) the Eastern Mátra Mtns. can be seen. This part of the Matra Mtns. is built up by andesitic rocks of Miocene age. In contrast to the Western Matra Mts., large caldera structures cannot be found here and the area is very poor in hydrothermal mineralisation.
The boundary between the flat southern foreland and the mountains roughly corresponds to the shoreline of an Upper Miocene (Pannonian) brackish sea. Important lignite deposits with 3.5 billion� tons resource were formed in this paleo-coastal region. The exploitation of lignite started before World WarII in this area.
From here to Miskolc, the motorway follows the boundary between the Alföld (The Great Plain) and hilly areas composed of Miocene volcanic units such as the Mátra Mtns. as well as the Bükkalja Hills. The Alfold to the south is the major agricultural area of Hungary and geologically corresponds to the Pannonian Basin. The subsidence of the basement that is composed of various metamorphic, granitic and Mesosoic-Tertiary sedimentary terrains started during the Miocene. Due to the rapid subsidence the basement now is at more than 4000 m depth in the southern part of the Alföld. The fast subsidence is related to a back-arc