Exploitation of pyrite ores and hydrothermal Sb-deposits in the Malé Karpaty Mts. culminated mostly at the break of 19th and 20th century. The host rocks of the mineralizations are black shales in the actinolitic schists and amphibolites. Streams, soils and the waters in the neighborhood of the abandoned deposits are contaminated by toxic metals, such as As, Sb, Zn, Zn, Al, and local acidification arises as well. Chemolithotrophic bacteria were identified in the mine-waters with pH 2.5 – 3. As solid secondary phases, gypsum and jarosite occure in weathered black shales and weakly crystallized young Fe ochreous precipitates mostly in streams and outflows of mine drainage. We expected the presence of ferrihydrite, schwertmannite, goethite and poorly crystalline ferric arsenate-sulphate precipitates (?) in ochres. According to the chemical composition, several types were recognized: depending on the primary mineralization As-, Si-, Al-, and SO4-rich ochres can be present. Sb, Zn, Ni, Pb, Cd are present in lower concentrations. Accumulation of Ti, P, Ca, Na, Na and K indicate the decomposition of the rock-forming minerals.
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- Environmental Impact of Exploration of Pyrite and Stibnite in the Malé Karpaty Mountains, Slovakia
- Springer Netherlands
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