The Çeltik prospect is mainly underlain by a sequence of andesite-basalt lavas and pyroclastics which belong to the Upper Cretaceous Çatak Formation. This unit grades upward into a well-bedded volcano-sedimentary series consisting of alternating clay rich limestones, marls, siltstones, volcanic tuffs, red mudstones with tuffaceous sandstones. Stratigraphically, these rocks occur directly above the same massive volcanic rocks which host mineralization at Taç and Çorak.