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A MINERALOGICAL AND GEOCHEMICAL ASSESSMENT OF THE TAILING IMPOUNDMENT AT RUDNANY DEPOSIT, SLOVAKIA

AUTHOR/S: B. LALINSKA, T. KLIMKO, J. MICHNOVA, L. JURKOVIC
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 2, 355-360 pp

ABSTRACT

Mineralogical composition of mining wastes deposited in voluminous tailing
impoundments around the world is the key factor that controls retention and release of
pollutants. Here we report geochemical and mineralogical investigation of one tailing
impoundment from Slovakia.
Ore deposit Rudňany was exploited from the end of 19th century and at 1963 the ore
started to be extracted by flotation process (barite, siderite and sulfides). Waste after
flotation was deposited into one tailing impoundment, which carries approximately 9.9
million tones of material. On average the tailing contains 17.39% of BaSO4, 20.32% of
Fe and 0.057% of Cu. Also significant are contents of Sb and Hg (Jančura et al., 2005).
The most common mineral in heavy fraction is barite; siderite is also frequent and is
slowly replaced by secondary Fe oxides in the oxidation part of tailing. Most common
sulfides are minerals from tetrahedrite group and pyrite, less common is chalcopyrite,
bornite and cinnabar are rare. In oxidation zone of tailing all sulfides except tetrahedrite
are being replaced by secondary oxides of variable composition. Also common are
grains of Cu and Fe oxides. The grains may be a product of a complete replacement of
the ores or they may have precipitated from the solutions which circulate through the impoundments.