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Within the lignite deposits located in the Oltenia coal basin, frequent sand bands are emerging, carriers of signifi cant aquiferous horizons and complexes. The geological pattern induces an important variation of hydro-geological conditions along the deposit’s spreading, which in turn gives difficulties in mining technology selection. Determining the problem’s solution involves th e versions ranking from the strongest to the weakest, in relation to all the criteri a. Both maximum and minimum criteria can exis...