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From 1960 to 1990 the former Soviet-German Wismut company milled uranium ore and processed a total of about 110,000 t of uranium at the Seelingstaedt mill in Thuringia, Germany. As part of its mine closure program the state-owned Wismut GmbH is remediating the Culmitzsch Uranium tailings pond covering 2.4 km² (vol. 85 M m³). To date, the Culmitzsch tailings pond has been partly interim covered and re-contoured. Final covering, landscaping and vegetation including hydraulics constructions are foreseen to be completed by 2022. The paper presents experiences gained and conclusions from the management of contaminated waters within the overall water management of the site. In addition the paper presents on-site-monitoring results of ongoing tailings consolidation influencing the overall water management of the site. Experiences from water management and the major challenges for granting the future remediation progress for the entire site are discussed with regard to the technical conditions and legal restrictions for water release to the receiving streams and concepts for surface cover design. Finally the paper provides an outlook to the long term after remediation. 2 Site characterisation The water management of the Culmitzsch TP is part of the overall water management of all mining sites of Wismut at Seelingstaedt including also the Truenzig TP (1.2 km², 19 M m³) and the former Uranium mill and https://papers.acg.uwa.edu.au/p/1208_20_Barnekow/ Experiences gained and major challenges for the remediation of Wismut's Culmitzsch U. Barnekow et al. tailings pond

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/ Fifteen years of design, construction and monitoring of soil covers on Wismut´s U. Barnekow and M. Paul uranium mining legacy sites-a synopsis 110 | Mine Closure 2013, Cornwall, UK

The remediation of the East German uranium mining sites operated and used until 1990 started in 1991 and was funded by the German Federal Government. However, most of the numerous abandoned uranium mining sites of third party property that were distributed all over Saxony were not included. In 2003 the Federal Government and the Free State of Saxony agreed to jointly fund the remediation of those abandoned mining sites of high priority. Wismut´s department for Project Management of Wismut´s Abandoned Saxonian Mining Sites was given the responsibility for the project management. The Dänkritz 2 uranium mill tailings pond is one of those abandoned sites (area: ca. 11 ha; vol. ca. 0.9 Mill. m³). Mill tailings were discharged during the 1950s surrounded by a max. 12 m high autostable ring dam, which was already reshaped during the 1960s to improve geotechnical stability. Dynamic stability calculations, applying the finite element program PLAXIS, were carried out by CDM Smith as part of the remediation design. They resulted in insufficient dynamic stability with respect to the maximum credible earthquake. In addition, soft fine-grained tailings needed to be stabilised to place a multi-layer type surface cover. Wismut designed the tailings remediation project. The paper will particularly focus on the advanced constitutive models used for the slope stability analyses of the embankment under dynamic loads and of the stability of the fine-grained tailings during interim cover placement. https://papers.acg.uwa.edu.au/p/1604_35_Koitzsch/ Remediation of the uranium mill tailings pond Dänkritz 2 -seismic slope stability analysis Y Koitzsch et al. and serviceability limit state design 532 APSSIM 2016, Brisbane, Australia