In the granitoid rocks of the Hodrusa-Stiavnica Intrusive Complex there are two magnetite types observed: primary magmatic phenocrysts of idiomorphic or even hypidiomorphic habit of about 0.3 mm size and magnetite grain size over 0.3 mm. These must have been originated due to the reaction of rock-forming minerals with the melt. Chemical composition of Fe- Ti oxide minerals from granitoid rocks of the regions under study proved their being formed by magnetite which contains magnetite solid solution as well as thin lamellae ilmenite solution. With its chemical composition this magnetite is similar to those from granitoid rocks — products of differentiation of trachyte-andesitic and trachyte-basaltic magma. Ni/Co ratio in the examined magnetites suggests a deeper magma origination under increased oxygen fugacity and original magma alkalinity. Elevated Au and lowered Pb and Zn contents in magnetites support the theory that the Intrusive Complex may have been one of the sources of the metals of base- and precious-metal mineralization in the Hodrusa-Stiavnica Intrusive Complex.