Kepez is one of the main mineralised zones within the Kiziltepe Project area. Following the completion of the geophysics program, the caldera model for the genesis of the gold-silver mineralisation across the Kiziltepe Sector remains a relevant and useful working hypothesis. The geophysical data has largely supported the model and has highlighted the presence of several structures that are likely to have been significant in the evolution of the epithermal mineral system across the area.
Kepez is a low sulphidation epithermal gold deposit influenced by a high-level subvolcanic porphyry. High-grade gold veining at Kepez is located on the Kepez Fault. The quartz varies from a texture dominated by amorphous milky and finely banded opal-chalcedony to crystalline (comb) quartz, indicative of low temperatures of formation.
The mineralisation is interpreted to have been deposited from a mixed magmatic-meteoric fluid. Rhyolitic porphyry domes display locally intense silica-pyrite-illite alteration, while the magmatic fluids responsible for this alteration have migrated into the adjacent permeable volcanic breccias resulting in extensive clay alteration.
The Kepez porphyry was identified in geological mapping as a 1600m x 900m rhyolitic quartz-feldspar porphyry. Ground magnetics suggests an intrusive character to the porphyry and identifies it as a sub-volcanic stock located on a 5km diameter ring-structure occurring within a volcanic caldera. The porphyry occurs at the point where the ring-structure is cross-cut by a major dextral strike-slip fault system. Based on the geophysical data, the porphyry body appears to have greater dimensions at depth than its surface outcrop suggests, extending 2000m x 1800m.