Samples of mining residues of treatment were also collected. Analyses show a high degree of pollution by Pb and As in the mining residues, in the sediments and waters with maximal values of respectively 5547 g/t and 192.2 g/t for the mining residues, 2277.4 mg/kg and 34.01 mg/kg for the sediments and 130 µg/l and 199,6 µg/l for surface waters.
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