The Sivrikaya Fe-skarn mineralization is hosted by dolomitic limestone layers of Late Cretaceous volcano-sedimentary unit, comprised of andesite, basalt and their pyroclastites, including, sandstone, shale and dolomitic limestone layers. Intrusion of the Late Cretaceous-Eocene ikizdere Granitoid in the volcano-sedimentary unit resulted in skarn mineralization along the granitoid-dolomitic limestone contact. The ore is associated with exoskarns, and mineralization is characterized by early anhydrous garnet and pyroxene with late hydrous minerals, such as epidote, tremolite, actinolite and chlorite. The ore minerals are mainly magnetite and hematite, with minor amounts of pyrite and chalcopyrite. The composition of garnet and pyroxene in the exoskarn is Adr(79.45 -99.03)Grs(0-17.9)Prs(0.97-2.65) and Di(69.1-77.1)Hd(22.2-29)jhn(0.6-1.4), respectively, and abundances of magnetite in the ore suggest that the Fe-skarn mineralization formed under relatively oxidized conditions.