The paper considers the influence of solid phase concentration in slurry flow and its viscosity on the process of pipeline transportation. In view of carried out researches it was assumed that slurry viscosity is proportional to solid particles concentration. The dependence of effective viscosity coefficient on slurry concentration is determined. Calculation of specific pressure drops for hydraulic transportation of concentration tailings is made with and without rheological properties of the thickened slurry tailings. The feasibility assessment of using polyurethane-lined steel pipes in the operating hydraulic transport tailings system of the Kachkanarsk Mineral processing plant is given. The comparison of total capital expenditure and operational costs for each of the considered options of the hydraulic transport system development is made. It has been estimated that the cost advantage is about 1060,38 million rubles for the operation period of 10 years of one technological chain of polyurethane coated pipeline with the diameter of 1000 mm in comparison with the traditional steel pipeline without such coating in the conditions of tail facilities of the Kachkanarsk Mineral processing plant.