This monograph provides an international perspective on pit lakes in post-mining landscapes, including the problem of geogenic acidification. Much has been learned during the last decade through research and practical experience on how to mitigate or remediate the environmental problems of acidic pit lakes. In the first part of the book, general scientific issues are presented in 21 contributions from the fields of geo-environmental science, water chemistry, lake physics, lake modeling, and on the peculiar biological features that occur in the extreme habitats of acidic pit lakes. Another chapter provides an overview of methods currently used to remediate acidic pit lakes and treat outflowing acidic water. The second part of the book is a collection of regional surveys of pit lake problems from three European countries and Australia, and case studies of various individual representative lakes. A final case study provides an innovative approach to assessing the economic value of new pit lakes and balancing the costs and benefits, a valuable tool for decision makers.

Switching off the pumps of a mine is one of the last steps in the lifetime of a surface or underground mine. As the water in the open space raises, the water might become contaminated with different pollutants and eventually starts to flow in the open voids. This book addresses the processes related to mine abandonment from a hydrogeological perspective. After an introduction to the relevant hydrogeochemical processes the book gives detailed information about mine closure procedures. Based on in-situ measurements the hydrodynamic processes in a flooded mine are described and some of the mine closure flow models exemplified. As all investigations base on precise data, the book gives some key issues of monitoring and sampling, especially flow monitoring. Then the book shows some new methodologies for conducting tracer tests in flooded mines and gives some hints to passive mine water treatment. At the end 13 well investigated case studies of flooded underground mine and mine water tracer tests are described and interpreted from a hydrodynamic point of view.

This book addresses the processes related to mine abandonment from a hydrogeological perspective and provides a comprehensive presentation of water management and innovative tracer techniques for flooded mines. After an introduction to the relevant hydrogeochemical processes the book gives detailed information about mine closure procedures. The book also includes case studies and hints, and some new methodologies for conducting tracer tests in flooded mines.

This monograph provides an international perspective on pit lakes in post-mining landscapes, including the problem of geogenic acidification. Much has been learned during the last decade through research and practical experience on how to mitigate or remediate the environmental problems of acidic pit lakes. In the first part of the book, general scientific issues are presented in 21 contributions from the fields of geo-environmental science, water chemistry, lake physics, lake modeling, and on the peculiar biological features that occur in the extreme habitats of acidic pit lakes. Another chapter provides an overview of methods currently used to remediate acidic pit lakes and treat outflowing acidic water. The second part of the book is a collection of regional surveys of pit lake problems from three European countries and Australia, and case studies of various individual representative lakes. A final case study provides an innovative approach to assessing the economic value of new pit lakes and balancing the costs and benefits, a valuable tool for decision makers.

Doktorarbeit / Dissertation aus dem Jahr 1995 im Fachbereich Geowissenschaften / Geographie - Phys. Geogr., Geomorphologie, Umweltforschung, Note: 1,0, Technische Universitat Clausthal (Abteilung Ingenieur- und Hydrogeologie), 264 Quellen im Literaturverzeichnis, Sprache: Deutsch, Abstract: Mit Vollendung der deutschen Einheit ist die Sowjetisch-Deutsche Aktiengesellschaft (SDAG) Wismut in den Besitz des Bundesministeriums fur Wirtschaft ubergegangen. Sie produzierte bis 1991, von wenigen Ausnahmen abgesehen, ausschliesslich fur die Sowjetunion Uran. Damit wurde die grosste Altlast der neuen Bundeslander mit einem geschatzten Sanierungsaufwand von 13 Milliarden DM in die Verantwortung der Bundesrepublik Deutschland uberfuhrt. "Die Bewaltigung dieser Erblast aus 40jahriger DDR-Vergangenheit gestaltet sich schwierig und langwierig," so der ehemalige Bundesumweltminister Dr. Klaus Topfer. "Hier handelt es sich um ein aufwendiges Grossprojekt, das in diesem Umfang bisher auf der Welt beispiellos ist. Deshalb werden hochste Anforderungen an alle Beteiligten gestellt. Altlastenermittlung, Sanierungsplanung und Konzeptfindung mussen auf solider fachlicher Grundlage durchgefuhrt werden. Die vollstandige Sanierung dieser Bergbaustandorte wird noch Jahre, wenn nicht Jahrzehnte in Anspruch nehmen." Ziel der vorliegenden, in das Sanierungskonzept der Wismut GmbH eingebundenen Arbeit ist es, eine Moglichkeit zu finden, den Austrag umweltgefahrdender Stoffe aus dem Bergwerk in die Umwelt zu minimieren. Dazu mussen die zeitliche und raumliche Anderung der Konzentrationen unterschiedlicher Wasserinhaltsstoffe in den Sickerwassern und dem Grubenwasser des ehemaligen Uranbergwerks Niederschlema/Alberoda geklart sein. Alle Ergebnisse und Verfahrensschritte wurden am Institut fur Geologie und Palaontologie, Abteilung Ingenieurgeologie, der Technischen Universitat Clausthal gewonnen. Sie wurden im Rahmen der Kooperation mit der Hauptabteilung T 1 der Wismut GmbH diskutiert und an den

This book addresses scientists and engineers involved in the areas of uranium mining and milling sites, clean-up measures, emissions of nuclear power plants and radioactive waste disposal, as well as political decision-makers. The topics covered are: impact on groundwater from radionuclide emission, analytical speciation techniques, chemical toxicity, radioisotope plant uptake, microbiology catalyzing U(6+) to U(4+) reduction, geochemical and reactive transport, case studies on abandoned uranium mines and milling sites, long-term storage of radioactive waste, passive in situ treatment techniques and risk assessment studies.