DBPapers
DOI: 10.5593/SGEM2014/B52/S20.098

THE INFLUENCE OF THE GEOLOGICAL SUBSTRATUM ON THE CHARACTERISTICS OF AGHIRES MINING LAKES, ROMANIA

S. V. Macicasan, G. Rosian, O. L. Muntean, R. Mihaiescu, L. Buzila, S. D. Raica,S. C. Bodea
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-18-6 / ISSN 1314-2704, June 19-25, 2014, Book 5, Vol. 2, 743-750 pp

ABSTRACT
Within the mining area from Aghireș, Romania, the exploitation activities of quartzkaolin sands and brown coal induced environmental disruptions, especially regarding the geological, geomorphological and hydrological components. The quarry exploitations led to the formation of several artificial water-bodies, referred to as mining lakes in this paper. These lakes may offer a great potential for the whole mining area in case of rehabilitation. The present study aims to identify the main physical and chemical characteristics of existing mining lakes, and to determine the influence of the geological substratum on them. As methods of analysis, both on-site and laboratory testing have been used. The final results confirm the initial premise that the water quality is influenced by the geological substratum, especially regarding the dissolute compounds and the concentration of hydrogen ions. In this respect it has been observed that three of the ten investigated mining lakes have an extremely acidic water environment (with pH levels lower than 4.0), while the rest have neutral pH levels. This is explained by the presence of coal deposits associated with pyrite in the underlying formations of acidic lakes. In fact, acidic waters are quite frequent in areas with underground coal resources. In correlation with other environmental impact studies, the outcomes of the present one will facilitate the development process of the most appropriate rehabilitation strategies for the investigated mining area.

Keywords: mining lakes, geological substratum, physical and chemical analyses ,quartz-kaolin, Aghireș, quarry rehabilitation