Recent efflorescences of Fe sulphates in a waste piles at Dlouhá Ves near Havlíčkův Brod (Czech Republic)Article PDF
Recent efflorescences of Fe sulphates in a waste piles at Dlouhá Ves near Havlíčkův Brod (Czech Republic)
The water-soluble sulfates: rozenite, melanterite, halotrichite, gypsum, rhomboclase, epsomite and alunogen were found in the waste piles of polymetal deposits in Dlouhá Ves near Havlíčkův Brod (Czech Republic). Ferrous sulfates, which are stable at low pH completely dominated. The green melanterite gradually dehydrated to form white rozenite which covers its surface. The highest content of melanterite-rozenite was in the top of the waste pile in coarse-grained rock material and in small caverns. Rozenite currently prevails and is accompanied by a small number of younger hair-like halotrichite mixed with epsomite and alunogen and locally also gypsum. The only representative ferric sulfate is rare rhomboclase. No toxic heavy metals in substantial quantities (e. g. Cu, Pb, Zn, As) were detected in the sulfates studied. This was due the high permeability of the upper coarse-grained parts of the mine dump and thus high mobility solutions, which did not have enough time to concentrate these compounds. Toxic components (As, Pb) are bound only at conditions of limited circulation of the solutions in finer material, poorly crystalline and amorphous ferric rusty-brown oxyhydroxidesulfates (AISA) and jarosite-beudantite minerals.
Stanislav Houzar*, Eva Kocourková, Vladimír Hrazdil, Department of Mineralogy and Petrography, Moravian Museum, Zelný trh 6, 659 37 Brno, Czech Republic, *email@example.com
Jiří Sejkora, Department of Mineralogy and Petrology, National Museum, Václavské nám. 68, 115 79 Praha 1, Czech Republic