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Yubileinoe

Kazakhstan

Main commodities: Au Cu
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The Yubileinoe porphyry gold deposit is located in western Kazakhstan, some 200 km southeast of the city of Aqtobe. It lies within the Magnitogorsk-Mugodzhar zone of the Urals, just east of the major north-south trending West Mugodzhar deep regional fault, and was emplaced within the ensimatic Urals-Zharma magmatic arc at approximately 380 Ma in the Middle Devonian. The host porphyry was intruded at the intersection of the Aulinskaya and Treshchinnaya faults which strike northeast and northwest respectively. It is a small to medium sized Au rich porphyry-style deposit with accompanying low grade Cu with a resource of around 10 Mt of ore @ 4 to 5 g/t Au, 0.4% Cu.

Mineralisation is associated with a 250 to 300 m diameter stock of plagiogranite porphyry. This stock is assumed to be an apophysis of a local concealed cupola of gabbrodiorite/granodiorite that in turn is part of the larger Late Devonian to Early Carboniferous Airyuk Intrusive Complex. The mineralised stock was intruded into a sequence of Siluro-Devonian volcanics and sediments that are part of the tholeiitic mafic volcanic dominated Mugodzhar Group which is overlain by the Mialyshy, Qundyzdy and Janghany Formations that comprise island arc volcanics and sediments (Shatov et al., 2003).

Ore mineralisation accompanies a stockwork developed within both the plagiogranite porphyry and its mafic volcanic wall rocks, and has been drill tested to more than 600 m below surface where it is still open at depth. Skarn, potassic and phyllic alteration are present within the orebody, although the latter predominates and is directly related to the stockwork and disseminated Au-Cu porphyry mineralisation. The principal metallic minerals are magnetite, pyrite, chalcopyrite, arsenopyrite, tetrahedrite, stibnite and native gold, with minor sphalerite, galena, scheelite, molybdenite, bornite, hematite (martite), rutile, ilmenite, anatase, and cinnabar.

Four ore zones have been delineated within the larger zone of stockwork mineralisation. The Central orebody, located within the core of the stock, is the largest and the richest of the four, with grades of from 5 to 10 g/t Au. The Western orebody lies along section of the western outer margin of the plagiogranite stock. It is 80 to 240 m long and 10 to 25 m thick, with grades ranging from 3.5 to 6.7 g/t Au, and has been traced to a depth of over 110 m. The Northern orebody is hosted by the wallrock volcanics, and follows the northeastern contact of the stock. It has surface dimensions of 80 x 16 to 37 m and has been traced to a depth of 100 m, with from 3.4 to 8 g/t Au. The Southeastern orebody straddles the contact of the plagiogranite porphyry stock, and carries 3.8 to 11 g/t Au. It is 60 to 120 m in length and from 10 to 121 m in thickness. The average grade is 4 to 5 g/t Au, 0.42% Cu and 65 g/t Ag (Seltmann et al., 2004, and references cited therein).

The most recent source geological information used to prepare this summary was dated: 2004.    
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:
Plotinskaya, O.Yu., Baksheev, I. and Minervina, E.A.,  2018 - REE distribution in scheelite from Yubileinoe porphyry gold deposit, South Urals: evidence from LA-ICPMS data: in    Geology of Ore Deposits (Geologiya rudnykh mestorozhdenii)   v.60, pp. 355-364.
Plotinskaya, O.Yu., Grabezhev, A.I., Tessalina, S., Seltmann, R., Groznova, E.O. and Abramov, S.S.,  2017 - Porphyry deposits of the Urals: Geological framework and metallogeny: in    Ore Geology Reviews   v.85, pp. 153-173.
Shen, P., Pan, H., Hattori, K., Cooke, D.R. and Seitmuratova, E.,  2018 - Large Paleozoic and Mesozoic porphyry deposits in the Central Asian Orogenic Belt: Geodynamic settings, magmatic sources, and genetic models: in    Gondwana Research   v.58, pp. 161-194.

   References in PGC Publishing Books: Want any of our books ? Pricelist
Seltmann R and Porter T M, 2005 - The Porphyry Cu-Au/Mo Deposits of Central Eurasia: 1. Tectonic, Geologic & Metallogenic Setting and Significant Deposits,   in  Porter T M, (Ed),  Super Porphyry Copper and Gold Deposits: A Global Perspective,  v2  pp 467-512
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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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