The Kalabak license is underlain by Tertiary intermediate to felsic volcanic and intrusive rocks (Fig. 1). Tertiary-age porphyry Cu-Au discoveries and project advancements are ongoing throughout the region in western Turkey, Greece, Macedonia and Serbia (e.g. Pilot Gold, Euromax and Eldorado Gold). All of these areas are underlain by Tertiary magmatic arc rocks similar to those in the Eastern Rhodopes. Approximately 50 kilometres north-northwest of the Kalabak target area, porphyry copper occurrences are hosted in the Tertiary Spahievo district within Bulgaria.