Poster

Tools for the integrated management of mining areas and river basins

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Abstract

The project had three objectives: Objective 1 To produce cost-effective tools for the evaluation of metals’ stocks and their mineralogical forms in tailing dams, Objective 2 To produce effective tools for the remediation of tailing dams, Objective 3 To develop innovative environmental services for the design of coupled monitoring systems and coupled environmental management plans in contaminated river basins. The economic partner studied the potential of the tailing dams for extracting Au and Ag. The measured concentrations, the horizontal and vertical heterogeneity, as well as the small volumes do not recommend the studied tailing dams for economic use at the current market prices and available technologies. No geophysical measure was correlated with the total concentration in the tailing materials, but the electrical resistivity was correlated with conductivity and pH, allowing production of a 3D distribution of these variables controlling the mobility of metals. The field vegetation study pointed out the natural patterns of vegetation colonization on the tailing dam, while the pot and field experiment allowed the identification of an economically appropriate method for accelerating the succession in areas with no vegetation. Within objective 3 results showed that the main problems related to phreatic water influenced by AMD are related rather to the pollution with N and P from traditional households, the contamination with metals being secondary in the studied catchment. The floodplain functioned as an important trap for contaminated sediments, with the intensity of retention controlled by longitudinal geomorphological profile and the later distribution controlled by local geomorphology and the vegetation cover. A detailed organizational analysis of the companies and stakeholders was performed and recommendations for improving the environmental management system and the cooperation in projects aiming at controlling the effects of negative externalities.

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