Abstract
A field study was performed on the effects of acid mine leachate from slate mine tailings seeping into a small river passing through the tailings. Before entering the tailings the river water has high alkalinity which neutralizes acidity upon mixing with leachate within the tailings. Downstreams of the tailings the pH of the river water ranges about pH = 8, the water contains high concentrations of sulfate (≈1500 μmol/l) and particulate bound aluminium (≈80 μmol/l), but low concentrations of dissolved aluminium (≈3 μmol/l). It is therefore assumed that Al(OH)3 colloids are precipitated during the neutralisation process and transported out of the tailings. The concentration of particulate bound aluminium along the river shows a strong correlation with the concentration of sulfate, which indicates that particulate bound aluminium is conservative. It therefore seems that under dry weather conditions (under most of the sampling was performed) no chemical retention mechanism exists which confines the distribution of aluminium to a restricted part of the catchment area. In contrast, the white river sediment is rich in both aluminium and sulfate, which suggests the temporary formation of aluminium hydroxosulfate minerals. Favorable (i.e. acidic) conditions may prevail at high discharges where the acidity accumulated in the tailings is flushed into the river with its subsequent acidification.
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Peiffer, S., Beierkuhnlein, C., Sandhage-Hofmann, A. et al. impact of high aluminium loading on a small catchment area (thuringia slate mining area) – geochemical transformations and hydrological transport. Water, Air, & Soil Pollution 94, 401–416 (1997). https://doi.org/10.1023/A:1026415905628
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DOI: https://doi.org/10.1023/A:1026415905628