Since 1996, hydrogeochemical surveys have been carried out in the Montevecchio Pb-Zn mining district (Sardinia, italy) to investigate variations in the aqueous occurrence of contaminants. Overall results showed decreasing concentrations of Zn, cd, and Pb in 2009 as compared with values recorded in 1996. The lowest dissolved concentrations of sulphate and metals were observed in correspondence of less acidic conditions. despite the ongoing natural attenuation, very high concentrations of toxic metals continue to be observed after 15 years since the mine flooding. Treatment of mine drainages before their discharge into the local streams is recommended to reduce the dispersion of contaminants.
Natural attenuation of contaminants in mine drainage at abandoned mines
CIDU, ROSA;FRAU, FRANCO
2010-01-01
Abstract
Since 1996, hydrogeochemical surveys have been carried out in the Montevecchio Pb-Zn mining district (Sardinia, italy) to investigate variations in the aqueous occurrence of contaminants. Overall results showed decreasing concentrations of Zn, cd, and Pb in 2009 as compared with values recorded in 1996. The lowest dissolved concentrations of sulphate and metals were observed in correspondence of less acidic conditions. despite the ongoing natural attenuation, very high concentrations of toxic metals continue to be observed after 15 years since the mine flooding. Treatment of mine drainages before their discharge into the local streams is recommended to reduce the dispersion of contaminants.
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