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Valja Strzh, Dumitru Potok

Serbia, Serbia

Main commodities: Cu Au
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The Valja Strzh and Dumitru Potok zones of porphyry style mineralisation are located in the Bor district, within the Timok Mountains of eastern Serbia, approximately 150 km SE of the capital, Beograd (Belgrade). See the Majdanpek record for their geological setting.

They are developed adjacent to the Late Cretaceous to Early Tertiary Crni Vrh plutonic complex which was emplaced along a regional fracture zone on the western margin of the Timoc Magmatic Complex. This complex intruded Late Cretaceous (Turonian) andesites and in part into clay-rich sediments of similar age. The plutons are composite magmatic complexes represented by a potassic intrusive series. Initial strontium ratios (17Sr/16Sr) show variations between 0.708 and 0.714, indicating a continental crust contaminated mantle source. In the deeper parts of the complex, monzonite and granodiorite prevail, while syenite, quartz diorite and quartz diorite porphyry are developed along the margin (Terzic, 1966)

Copper mineralisation is related to hydrothermally altered intrusives and to andesitic sub-volcanic and extrusive complexes. Extensive zones of alteration occur at the margins and in the central parts of the plutonic complex in a zone which is over 8 km in length. Alteration facies include propylitic, dominated by chlorite and epidote with silicification and pyritisation (Jovanovic, 1974). Several occurrences of copper mineralisation have been so far identified but only two large, sub-marginal grade deposits of are known, namely Valja Strz and Dumitru Potok. There are some indications of epithermal mineralisation developed at the margins of these bodies (Jovanovic 1974).

These deposits contain resources of approximately:
  Valja Strzh - 480 Mt @ 0.2% Cu, 0.04 g/t Au
  Dumitru Potok - 290 Mt @ 0.21% Cu, 0.1 g/t Au

The most recent source geological information used to prepare this summary was dated: 2005.    
This description is a summary from published sources, the chief of which are listed below.
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  References & Additional Information
   References in PGC Publishing Books: Want any of our books ? Pricelist
Armstong R, Kozelj D and Herrington R, 2005 - The Majdanpek Cu-Au Porphyry Deposit of Eastern Serbia: A Review,   in  Porter T M, (Ed),  Super Porphyry Copper and Gold Deposits: A Global Perspective,  v2  pp 453-466
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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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