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Murgul, Cakmakkaya, Anayatak |
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Turkey |
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Cu Zn Ag Au Pb
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Super Porphyry Cu and Au
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The Murgul copper deposits of Cakmakkaya and Anayatak are located near the Black Sea coast of north-eastern Turkey (#Location: 41° 14' 35"N, 41° 34' 45"E).
They are part of the Madenkoy-Murgul string of volcanic hosted massive sulphide (VMS) deposits that extends along the Black Sea coast of eastern Turkey.
The deposits are associated with the formation of Upper Cretaceous island arc volcanism and is related to a 250 m thick felsic pyroclastic member. This part of Turkey contains a 2000 to 3000 m thick pile of volcanics with relatively thin intercalations of marine sediments and range in age from early Jurassic to Miocene. These volcanics were emplaced in three phases:
i). Jurassic to upper Cretaceous, commencing with basalts, which change progressively to felsic lava flows and then to thick pyroclastics which contain the bulk of the mineralisation,
ii). minor transgressive volcanic breccias, tuffs and marine sediments overlain by late Cretaceous limestones,
iii). Palaeocene marine sediments followed by andesitic and minor basaltic lava flows.
Mineralisation is associated with an intense 2 stage alteration of the host rocks, comprising (a). an early phyllic and argillic phase and (b). late stage silicification.
The deposit is composed of:
• an early widespread disseminated, fine grained pyrite-chalcopyrite ore with varying contents of from 0.2 to 0.7% Cu,
• a subsequent stockwork like pyrite-chalcopyrite and lesser sphalerite-galena ore with an average grade of 1.0 to 2.5% Cu, and
• small late stage lodes (short veins of open space filling) with 5 to 10% Cu. The mineralised zones are funnel shaped with oval surface expressions elongated in a NNW direction and entending to depths of 250 m.
The total reserves in the two main deposits at Cakmakkaya and Anayatak amounted to approximately:
40 Mt @ 1.25% Cu, 0.1% Zn, 0.05% Pb, 25 g/t Ag, 0.2 g/t Au in 1988.
Cagatay (1990) quotes reserves + historical production of:
71 Mt @ 1.1% Cu, 0.1% Zn, 0.05% Pb, 38 Mt of which was produced from 1972 to 1992.
For detail see the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 1988.
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.
Cakmakkaya and Anayatak
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Selected References:
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Cagatay, M.N., 1993 - Hydrothermal alteration associated with volcanogenic massive sulfide deposits: examples from Turkey: in Econ. Geol. v.88, pp. 606-621.
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Schneider, H.J., Ozgur, N. and Palacios, C.M., 1988 - Relationship between alteration, rare earth element distribution, and mineralization of the Murgul Copper deposit, northeastern Turkey: in Econ. Geol. v.83, pp. 1238-1246.
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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, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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