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The Yaman-Kasy volcanic hosted massive sulphide copper - zinc - gold - silver deposit is situated in the western part of the Urals Mountains in the Mednogorsk region of the Russian Federation.

For details of the regional setting, see the Regional Setting section of the 50 Let Oktyabrya record.

It is in a region considered to be a part of the Sakmara zone, a fragment of the Ordovician-Silurian marginal sea developed at the periphery of the Urals palaeo-ocean. The Yaman-Kasy deposit, as are the majority of the Ural VHMS deposits, is located in a narrow pull-apart extensional zone which was filled with rhyolite-dacite lavas of the Blyava rhyolite-basalt complex, overlying a serpentinite-basalt basement. It is an example of one of the least metamorphosed VHMS deposits known.

The orebody occurs as a lens about 100 m long, forming a 37 m thick sulphide mound. It is hosted by a ~200 m thick sequence of rhyolitic to dacitic lavas and hyaloclastites, underlain by basalts and overlain by basaltic andesites.

The footwall to the massive sulphide is an altered rhyolite composed of quartz, chlorite, and sericite. The sulphide lens is zoned upward from a pyrite-rich basal zone, to sphalerite-chalcopyrite, to chalcopyrite-pyrite-sphalerite. The uppermost parts of the lens are dominantly sulphide-cemented breccias that contain sulphide chimney fragments and sulphidised vent fossils. Well-bedded clastic sulphide turbidites which are intercalated with bedded quartz-hematite jasper form the lateral equivalents of the massive sulphide lens and contain small fragments of sulphide chimney material and sulphidised vent fossils.

The deposit is small, with a resource (Maslennikov et al., 2009) of:
    2.5 Mt @ 2.5% Cu, 5.5% Zn, 3 g/t Au, 33 g/t Ag.

The most recent source geological information used to prepare this summary was dated: 2009.    
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:
Maslennikov V V, Maslennikova S P, Large R R and Danyushevsky L V,  2009 - Study of Trace Element Zonation in Vent Chimneys from the Silurian Yaman-Kasy Volcanic-Hosted Massive Sulfide Deposit (Southern Urals, Russia) Using Laser Ablation-Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS): in    Econ. Geol.   v104 pp 1111-1141
Vikentyev, I.V., Belogub, E.V., Novoselov, K.A. and Moloshag, V.P.,  2017 - Metamorphism of volcanogenic massive sulphide deposits in the Urals. Ore geology: in    Ore Geology Reviews   v.85, pp. 30-63.

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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