The wastes from gold mining need to be monitored from the beginning to the mine closure. The wastes from tailings dam were characterized by XRD, XRF, elemental analysis of carbon and sulfur and ICP-OES. In RFOAT (flotation waste) were observed quartz, dolomite, pyrite, muscovite and chamosite. Already, in RCOAT (cyanidation waste), other than those described in RFOAT, sphalerite, galena, pyrrhotite, microcline and albite. It was observed, a higher concentration of sulphide minerals in the cyanidation waste. In relation to C and S content, to RFOAT and RCOAT, they were 2.5 and 0% and 15.4 and 0.64%, respectively, indicating the presence of sulphides and organic reagents flotation in the cyanidation. The analysis by ICP-OES indicated for RFOAT and RCOAT, Zn and Pb content (mg/kg) Zn (399) and Pb (136) and Zn (7,900) and Pb (13,000), respectively. Analysis as Zeta potential, SEM, ICP-OES and ecotoxicity are carried out.