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The occurrence of mine water colloids mainly results from the formation of oxyhydroxides and hydroxysulfates of Fe(III) and Al. In acid rock drainage solutions As and Pb are strongly associated with the colloids. In the near-neutral bulk waters of mines, as for instance in adit waters, trace elements such as As, Pb, Cu and the rare earth elements are sorbed. These trace contaminants can be scavenged...