High-grade gold-bearing epithermal quartz veins hosted by subaerial to subaqueous Lower Miocene andesitic-dacitic lava dome.
These lavas show strong adularia-sericite alteration and silicification.
The basement is Paleozoic metamorphic rocks and limestones, cut by medium- to high-level intrusions.
Middle to late Miocene extensional tectonic activity was accompanied by normal faulting with a later, variable sinistral strike-slip component.
These faults controlled the development of the epithermal quartz veins.
Presence of low-temperature epithermal textures (including crustiform banding, quartz pseudomorphs after bladed calcite, and multiphase hydrothermal breccias).
Gold is related to earlier-formed deep quartz-adularia veins and breccias.
Mineralizing fluids : 150º to 250ºC and 7.0 to 8.0 wt% eq. NaCl.
Resources : 2,980,000 tonnes at 9.0 g/t Au.
References:
- Yilmaz, H. (2002): Ovacik gold deposit: An example of quartz-adularia-type gold mineralization in Turkey. Economic Geology 97, 1829-1839.
- Yilmaz, H., Tolga, O., Arehart, G.B., Colakoglu, A.R., and Billor, Z. (2007): Low-sulfidation type Au–Ag mineralization at Bergama, Izmir, Turkey. Ore Geology Reviews 32, 81-124.
Mineral List:31 entries listed. 24 valid minerals.
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