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[en] We examined sediment from an open pit lake that was intensively used for coal mining during the first decade of 20th. century. Today, the site (Lake 111, Lusatia, Germany) is flooded and water has extreme chemistry: low pH values (2-3), high concentrations of sulphate (up to 2000 mg/l) and elevated concentrations of Fe, Zn and Mn. As a result, anoxic sediment accumulated elevated concentrations of these elements, especially high levels of reduced sulphur compounds. (orig.)
Source
Friese, K.; Kirschner, K.; Schultze, M.; Wendt-Potthoff, K. (eds.); UFZ - Umweltforschungszentrum Leipzig-Halle GmbH, Magdeburg (Germany). Sektion Gewaesserforschung; 80 p; 2000; p. 33-35; Workshop on geochemistry and microbiology in sediments of mining lakes; Workshop Geochemie und Mikrobiologie in Sedimenten von Bergbaurestseen; Magdeburg (Germany); 23-25 Feb 2000; ISSN 0948-9452; 
; Available from TIB Hannover
; Available from TIB Hannover