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Seasonal variability of extremely metal rich acid mine drainages from the Tharsis mines (SW Spain)
2020
Moreno González, Raúl | Cánovas, Carlos Ruiz | Olías, Manuel | Macías, Francisco
The Tharsis mine is presently abandoned, but the past intense exploitation has left large dumps and other sulphide-rich mining wastes in the area generating acid mine drainages (AMD). The main goal of this work is to study the effect of hydrogeochemical processes, hydrological regime and the waste typology on the physicochemical parameters and dissolved concentrations of pollutants in a deeply AMD-affected zone. Extreme leachates are produced in the area, reaching even negative pH and concentrations of up to 2.2 g/L of As and 194 g/L of Fe. The results of the comparison of ore grades of sulphide deposits with dissolved concentrations in waters shows that Pb is the least mobile element in dissolution probably due to the precipitation of Pb secondary minerals and/or its coprecipitation on Fe oxyhydroxysulphates. Arsenic, Cr, and V are also coprecipitated with Fe minerals. Seasonal patterns in metal contents were identified: elements coming from the host rocks, such as Al, Mn and Ni, show their maximum values in the dry period, when dilution with freshwater is lower and the interaction of water-rock processes and evaporation is higher. On the other hand, As, Cr, Fe, Pb and V show minimum concentrations in the dry period due to intense Fe oxyhydroxysulphate precipitation. In this sense, large sulphide rich waste heaps would be a temporal sink of these elements (i.e. Pb, As, Cr and V) in the dry period, and a significant source upon intense rainfalls.
Afficher plus [+] Moins [-][Application of in-situ technique against an inorganic pollution: an example [bioventing]]
1997
Petersen, P.A. | Vestergaard, A.B.
Merseburg Technical College [Microbial desulphurization]
1992
Neumann, W. (Technische Hochschule Leuna-Merseburg, Merseburg (Germany). Inst. fuer Biotechnologie)
Spatial distribution of acid-volatile sulphide concentration and metal bioavailability in mangrove sediments from the Brisbane River, Australia
1996
Mackey, A.P. | Mackay, S. (Centre for Biological Population Management, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001 (Australia))
Aluminium production as a source of atmospheric carbonyl sulfide (COS)
1995
Harnisch, J. | Borchers, R. | Fabian, P. | Kourtidis, K. (Max-Planck-Institut fuer Aeronomie, Kaltenburg-Lindau (Germany))
COS, CS2 and SO2 in aluminium smelter exhaust - The contribution of aluminium production to the global COS budget
1995
Harnisch, J. | Borchers, R. | Fabian, P. (Max-Planck-Institut fuer Aeronomie, Katlenburg-Lindau (Germany))
