The greatest engineering challenges in the process of exploitation of lignite, began after the flooding of the surface mine "Tamnava - West field" in May 2014. Specific geotechnical conditions required changes in technology on excavation and landfill, and the task in order to continue with production of coal was solved with methods which exceeded former theoretical knowledge. All solutions are checked with geotechnical investigation works, geostatic calculations and with geodetic monitoring of problematic field. The main objective of this paper is to show ways to overcome the shortcomings of previously designed solutions. At this moment, mullock material is used for ensuring the stability of temporary slopes and for extrusion of watery and muddy material in landfill toe area.
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