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Ovacik

Turkey

Main commodities: Au
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The Ovacik low sulphidation epithermal quartz vein gold deposit is located 100 km north of Izmir in Bergama County, western Turkey.

A number of other deposits are found in the region, including Efemcukuru (5 km south of Izmir) with 3.1 Mt at 14.6 g/t Au in a NW-SE trending, steeply dipping, structurally controlled, highly sulphidic (Pb+Zn+pyrite) epithermal quartz vein system hosted by altered hornfels and phyllite within an ophiolite zone and Kücükdere, 35 km to the north of Ovocik, with 1.4 Mt at 6.4 g/t Au as a series of NE trending epithermal quartz and calcite and/or ankerite veins hosted by Miocene andesitic volcanic rocks.

The regional geology surrounding Ovacik comprises Palaeozoic metamorphic rocks and limestone which are cut by medium- to high-level intrusions and overlain by subaqueous and subaerial Miocene andesitic to dacitic lava domes which host the Ovacik gold deposit.   Middle to late Miocene extensional tectonic activity, accompanied by normal faulting, produced NNE-SSW to NE-SW trending grabens.

Mineralisation at the Ovacik deposit is developed adjacent to the ENE trending Bergama graben and is associated with a strongly faulted Miocene subaerial andesitic to dacitic lava dome complex with mineralised zones being confined to east-west to NE-SW trending normal faults exhibiting variable late sinistral strike slip movement.

Significant gold mineralisation at Ovacik is contained within two of the four known, generally east-west trending, epithermal veins.   These veins display low-temperature epithermal textures such as quartz pseudomorphs after bladed calcite, crustiform banding and multiphase hydrothermal brecciation.   They are exposed over a maximum strike lengths of 400 m and are up to 35 m wide at the surface, while mineralisation extends down dip for at least 200 m.

Gold mineralisation is apparently mainly related to early-formed quartz-adularia veins and breccias with gold being found mainly in clasts of earlier vein material within a matrix containing little gold.   The mineralised clasts appear to have been transported from deeper levels in the vein system.   Alteration associated with mineralisation is composed of secondary albite or adularia together with quartz and clays, including smectite, interlayered illite/smectite and illite/chlorite, illite, and chlorite.   Traces of chalcopyrite, pyrite, arsenopyrite, sphalerite, bornite, chalcocite, covellite, galena are also present as well as electrum.

In 2002 the resource delineated at Ovacik was 2.98 Mt at 9.0 g/t Au for 26.7 t (0.862 Moz) of contained Au.
The resource quoted for Ovacik by Yilmaz, et al., 2007 was 4.19Mt @ 7.6g/t.

For detail consult the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 2002.    
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd.   Unauthorised copying, reproduction, storage or dissemination prohibited.


  References & Additional Information
   Selected References:
Kuscu, I., Aluc, A., Bogdanov, K., Todorova, D., Kuncheva, J. and Stoyanova, S.,  2013 - Western Anatolian Precious Metal Deposits: in    Sofia SEG Student Chapter Field Trip 20th -26th October, 2013,   Field Trip Guide, 35p.
Yilmaz H  2002 - Ovacik Gold deposit - an example of Quartz-Adularia-type Gold mineralization in Turkey: in    Econ. Geol.   v97 pp 1829-1839
Yilmaz H, Oyman T, Arehart G B, Colakoglu A R and Billor Z,  2007 - Low-sulfidation type Au-Ag mineralization at Bergama, Izmir, Turkey: in    Ore Geology Reviews   v32 pp 81-124


Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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