The paper describes the results of radiometric dating of the Hodrusa granodiorite by various methods (K/Ar, Rb/Sr and U/Pb). Zircons within the granodiorite exhibit ages that are greater than those obtained for the host rock, suggesting that they formed prior to the solidification of the granodiorite. On the basis of the radiogenic Pb²⁰⁷/Pb²⁰⁶ atomic ratio, it is possible to estimate that the zircons of the Hodrusa granodiorite were formed between Carboniferous and Permian ages. During the period between 21 and 24 m. y. the zircons lost much of their radiogenic lead as a result of partial melting of the surrounding host rock. Radiometric measurements of Rb/Sr isotopes also indicate a Neogene age for the granodiorite. It appears that assimilation of magmatite which is closely related to the monzodiorite-gabbro country rock, or which occurs as xenoliths within the granodiorite body, played very important role.