The “Hajvalia” mine is flooded after the war of the year 1999. The technical and engineering team of the mine has no access in the mine, primarily in the mine's productivity levels. In order to get mine access it is needed dewatering of the mine site. Amount and quality of the Pb-Zn ore in this mine, proves positive economic indicators for exploitation of these reserves and furthermore expanding of the ore reserves with exploration works. The feasibility study of the “Hajvalia” mine shows positive indicators as IRR=30.49% and NPV = 11.60 US$, with interest rate of 10%, for the 10 years of the time period. In this paper is given brief description of the mine’s economic indicators and worldwide Pb-Zn demand as per justification of mine dewatering process i.e. profitability of the mine. The general cost related on dewatering of “Hajvalia” mine will be calculated in this paper. While it will be avoided calculation cost related on ensuring the stability and ventilation of the mine. Economical calculation will be based on the water volume inside of the mine, based on electricity consumption of the related pumps, needed in the dewatering process. Water volume (m3) is while based on the volume of the flooded mine’s space.