The project “Recycling of mineral fractions from tailings” aims to separate pollutants and valuable materials tailings from tailings. The use of remaining mineral fractions for building materials as a secondary raw material is made possible. Bioleaching is used to extract metal, especially lead, mineral fraction, which have been recovered by flotation from tailings. For this purpose, the fractions were incubated with sulfur-oxidizing bacteria, microorganisms that form low-molecular organic acids and with low-molecular organic acids. After acidophilic bioleaching, manganese (approx. 2 g/L), iron (approx. 8.5 g/L), and zinc (approx. 1 g/L) were detected in the leaching solution. In a second campaign, microorganisms that produce low molecular weight organic acids were used, and the growth of these microorganisms was inhibited. In a third, series of experiments culture supernatants with desired low molecular weight organic acid were used for leaching. With this process, 50% to 60% of the lead contained in the mineral fraction were leached.