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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/33462

Title: Hydrological conceptual model characterisation of an abandoned mine site in semiarid climate. The Sierra de Cartagena-La Unión (SE Spain)
Authors: Robles-Arenas, Virginia María
Candela, Lucila
Issue Date: 2010
Abstract: A comprehensive study at Sierra de Cartagena-La Unión (SE Spain) abandoned mine site was carried out to characterise the regime and water quality of the groundwater system after the mine closure. The system consists of five geologic fractured blocks belonging to the Alpujarride and Nevado-Filabride complexes. The aquifer units are composed of limestone and dolostone materials. Recharge is mainly controlled by the N-130 fault system, man-made induced fractures, open-pits and underground workings. Discharge is indicated from open pit lakes by the proximal dome-shaped groundwater level contours. Aquifer natural recharge, assessed by fracture density maps and chloride mass balance, provided consistent results. The water hydrochemical facies show a marked sulphate concentration and acidic pH (average pH of 2.53-6.30). A maximum concentration of 4,100 mg/L of Zn and 40,000 mg/L of sulphate was observed in open-pit lakes. Springs present the lowest residence time and are low mineralised with an average pH of 7.6. Geochemical modelling based on the PHREEQCI code indicates water undersaturation with respect to almost all related mineral species and anoxic conditions prevail in the system. Although an adequate understanding of the regional system is provided, a further detailed hydrochemical study is necessary to assess the undergoing geochemical changes.
Sponsorship: The authors would like to thank the Ministry of Science and Innovation (project CGL2007-66861-C04) and the Seneca Foundation of Spain (project PB/44/FS/2002) for the financial support.
Publisher: Universidad de Barcelona
Keywords: Fractured aquifer
Open-pit and underground mining
Sierra de Cartagena-La Unión
Acid mine drainage
Semi-arid zone hydrology
URI: http://hdl.handle.net/10481/33462
ISSN: 1695-6133
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Robles-Arenas, V.M.; Candela, L. Hydrological conceptual model characterisation of an abandoned mine site in semiarid climate. The Sierra de Cartagena-La Unión (SE Spain). Geologica Acta, 8(3): 235-248 (2010). [http://hdl.handle.net/10481/33462]
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