Associated to the Sabanalarga Batholith in the ltuango area there are mineralizations of sulfides. The zone of interest is located in the geologic limit between rocks of continental and oceanic affinities, marked by the Cauca-Romeral Fault System. The Sabanalarga batholith, with radiometric ages of 97±10 and 98,2±3,5 m.a., is a pluton of intermediate composition with some mafic and ultramafic facies to which sulfides are associated. The batholith intrudes the Paleozoic metamorphic rocks of the Valdivia Group and it is in fault contact with the rocks volcanic-sedimentary rocks of the Barroso Formation. To the east of the batholith, there are ultramafic rocks no associated to the it and to the west quaternary deposits. The mineralizations occur in the ravines El Encanto, Chontaduro and El Tinto. The sulfides present are massive and disseminated in the form of bands and large purse with thicknesses between 0.4 -3 m. The mineralization is constituted by pirrotina and to a less proportion chalcopyrite, magnetite and pyrites, with small amounts gold and silver. The gangue minerals are olivine, pyroxens and an uralitic anfibol. The ratio sulfites/ silicates varies from 1 / 9 in the disseminated mineralizations to 4/ 6 and 7/3 in the massive mineralizations. The samples were analyzed by atomic absorption and present concentrations between 200 ppm and 2,38% in cupper, from 44 and 146 ppm in zinc, 280-710 ppm in nickel and 29 to 552 ppm in cobalt. The analysis for gold and silver weremade by cupellation, obtaining results between 0.28 and 2.13 g/ton for gold and 3.31 - 20.5 g/ton for silver. From the mineralogical association, lithology and tectonic environment it is considered that sulfides manifestations are due to magma tic segregation formed by processes of gravitational differentiation in the magma tic chamber.