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By Hartmut Biele, Stephanie Hurst (auth.), Prof. Dr. Broder J. Merkel, Dipl. -Geol. Andrea Hasche-Berger (eds.)

Uranium is a component to be came across ubiquitous in rock, soil, and water. Uranium concentrations in common floor water should be greater than a number of enormous quantities µg/l with no impression from mining, nuclear undefined, and fertilizers. contemplating the WHO advice for consuming water of 15 µg/l (has been as little as 2 µg/l prior to) end result of the chemical toxicity of uranium the aspect uranium has develop into a tremendous factor in environmental study. in addition to average enrichment of uranium in aquifers uranium mining and milling actions, additional uranium processing to nuclear gasoline, emissions shape burning coal and oil, and the appliance of uranium containing phosphate fertilizers may well enhance the average uranium concentrations in soil and water by means of a ways. In October 1995 the 1st foreign convention on Uranium Mining and Hydrogeology (UMH I) was once held in Freiberg being geared up via the dep. of Geology on the Technical college Bergakademie Freiberg by way of the aid of the Saxon nation Ministry of Geology and surroundings. as a result huge medical curiosity within the subject of uranium a moment convention (UMH II) happened in Freiberg in September 1998. moreover, in September 2002 scientists engaged on the subject of uranium mining and hydrogeology attended the 3rd convention (UMH III) which was once together held including the overseas Mine Water - sociation (IMWA) Symposium 2002. The reviewed papers and posters of the 2002 convention were released through Springer entitled Uranium within the aquatic en- ronment (edited by means of Merkel, Planer-Friedrich and Wolkersdorfer).

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Canada, May 31-June 6, 1997 WISMUT’99, Proceedings of International Workshop on Stabilization of Fine Tailings, Part 1: The Scientific Basis, Edmonton, Canada, May 26-27, 1999, Syncrude Canada Ltd. and Part 2: Practice and Experience, Chemnitz; Germany, June 23-25, 1999, Wismut GmbH. , C. Pelz „Multi-Attribute Decision Analysis of Remediation Options for Uranium Mill Tailings Impoundment in Eastern Germany“, Inter. , G. M. T. Jakubick, D. Lush, D. Metzler, „Integrating Technical and Non-technical Factors in Environmental Remediation“, Proceedings of UMREG’02, 2003, Wismut GmbH and ICEM 2003.

Such trends while inconsistent with other studies can perhaps be attributed to the presence of a non-barite host phase for Ra. 005 mg/L. The reductive dissolution of Ra-bearing barite or radiobarite, can result in the addition of substantial Ra to porewaters. In a uranium tailings impoundment in Canada, for example, the dissolution of radiobarite in reducing horizons resulted in elevated levels in porewaters of ca. 80 Bq/L (Martin et al. 2003). The relatively low Ra and Ba values measured in the porewaters at Ranger suggest that such processes are not occurring to any appreciable extent and that other mechanisms are controlling the mobility of Ra under the predicted reducing environment.

This zone is characterised by high conductivity (> 25 mS/cm) and near neutral to slightly acidic pH water and (b) a lower zone which extends from the inflection point at RL 35 to the base of the dam. This zone is characterised by a 50% decrease in conductivity within a few metres of the inflection point and slightly basic pH water. Like the overlying tailings pond water, the major ion chemistry is characterised by magnesium, sulfate, calcium, manganese, and ammonia. 44 44 Site 3 Site 5 Pond Pond 40 40 Sub-aerial 36 Depth (RL) Sub-aqueous 32 Tailings 28 40 Base of Dam Sub-aerial 36 Sub-aqueous Depth (RL) Sub-aerial 36 Depth (RL) 44 Site 4 Pond 32 Tailings 28 Sub-aqueous 32 Tailings 28 Base of Dam 24 24 24 Base of Dam 20 0 20 40 60 80 100 20 0 20 20 Dissolved [Fe] mg/L 40 60 80 100 0 20 Dissolved [Fe] mg/L 44 44 Site 6 Site 9 Pond Pond 40 40 Sub-aerial 36 Sub-aerial 36 Sub-aqueous Depth (RL) Depth (RL) 40 32 Tailings Sub-aqueous 32 Tailings 28 28 Base of Dam 24 24 Base of Dam 20 20 0 20 40 60 80 100 0 20 40 60 80 Dissolved [Fe] mg/L Dissolved [Fe] mg/L Fig.

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