The Kotana prospect is located about 30 km south of Giresun (NE Turkey). The ore mineralization is a Feskarn occurring within the low-grade pre-Lower Jurassic Pınarlar metamorphics, consisting of marble-phyllite intruded by the Upper Cretaceous−Eocene Aksu biotite monzogranite. | Sphalerite associated with pyrrhotite chalcopyrite ore occurring in the Kotana Fe-skarn Deposit (Giresun, NE Turkey): Exsolution or replacement