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Siberia, Russia
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The Aksug porphyry Cu-Mo deposit cluster is located within the Altai Sayan region of central Siberia in eastern Russia, 400 km SSE of Krasnoyarsk (#Location: 53° 25' 47"N, 96° 34' 47"E).

Other mineralised centres within the cluster include the Kadyroy and Dashtyg copper porphyries and the Biche-Kadyr-Oos intermediate sulphidation epithermal Au-Ag Ore prospect (Kuzhuget et al., 2023).

The deposit occurs within the Khamsarin terrane of Cambrian volcanic arc rocks on the northern periphery of the Todzhin metamorphic subterrane, all of which are cut by Late Cambrian granitoids. The closest unit with late Neoproterozoic (Vendian) to Early Cambrian ophiolites, the Kurtushibin ophiolites, which can be interpreted as a trace of the coeval subduction zone, is ~130 km to the west (Yakubchuk et al., 2012).

The deposit is localised within the Kandat Fault Zone, which cuts the granitoids of the composite Aksug Pluton. This pluton consists of at least two different intrusive suites, including Early (Silurian?) diorite-monzonite, granodiorite and granodiorite porphyries, emplaced into a 5 x 8 km gabbrodiorite to diorite intrusive massif. These units are intruded by dykes of leucocratic granite and granosyenite. The complex is also intruded by Late Devonian equigranular and porphyritic tonalite and trondhiemite.

At the deposit scale, the deposit is associated with a small cupola-shaped plagiogranite-porphyry stock, with steep-dipping (60 to 80°) contacts. The mineralisation follows the outer contact of the intrusion, which has a poorly mineralised core.

40Ar/39Ar dating of phases of the pluton has yielded an age of 497 to 462 Ma. These rocks of the pluton are intruded by stocks and dykes of ore-bearing porphyry which consist of quartz-diorite and granodiorite dated in the range 404 to 401 Ma, and 364 to 354 to 331 to 324 Ma ages, for the stocks and dykes of ore-bearing porphyry (Sotnikov et al., 2003). These dates are accompanied by Cambrian 40Ar/39Ar ages (532±3, 523±5 Ma; amphibole) for the oldest rocks at Aksug (Sotnikov et al., 2003). However, Berzina et al. (2003) reported Re-Os ages of 511±2, 516±2, and 518±2 Ma for molybdenite. Subsequently, Berzina and Berzina (2008) published 40Ar/39Ar results of 497 to 462 Ma for the plutonic phases. Recently, GRK Intergeo has obtained new Re-Os ages for early (517.4±3 Ma) and late (317.3±3 Ma) molybdenite, indicating a possible Middle Cambrian principal mineralising event and a separate Devonian event.

The stock was subjected to pervasive hydrothermally alteration, with a barren quartz stockwork in its core, and an outer well-developed pyrite halo of quartz-sericite-carbonate-pyrite, with rich copper mineralisation at depth.

Stockwork mineralisation is confined to quartz-sericite altered zones within the porphyry stocks. The mineralisation consists of two phases. The low-grade (0.1 to 0.2% Cu; 0.003% Mo) molybdenite-pyrite-chalcopyrite mineralisation is associated with the first-generation granodiorite porphyries. Subsequent emplacement of a second generation of granodiorite porphyries upgraded the initial disseminated mineralisation to produce a superimposed chalcopyrite-bornite-molybdenite assemblage (0.3 to 1.0% Cu; 0.01 to 0.02% Mo). The average Cu and Mo grades is 0.67% and 0.015% respectively. However, Yakubchuk et al. (2012) suggesty the two phases comprise an initial chalcopyrite-bornite-molybdenite assemblage and superimposed molybdenite.

The general sequence of mineral assemblages at the Aksug deposit has been distinguished as: i). quartz-pyrite with hematite, ii). quartz-molybdenite with pyrite and chalcopyrite, iii). quartz-chalcopyrite with bornite, pyrite and molybdenite, iv). tertahedrite-tennantite, enargite, galena and sphalerite, and v). quartz-calcite. At lower levels, the rocks are rich in anhydrite, and, to a lesser extent also barite and celestine.

The richest mineralisation at Aksug is in the Northern orebody, which to the west, is concealed beneath the Dashtygoi graben. Drilling in the graben has intercepted a continuation of the Northern orebody at depth of 800 to 1000 m, indicating additional potential. Geochemical and geophysical (gravity and magnetic) data indicate the potential extension of the Aksug structure to the west, beneath and along the Devonian graben, for >7 km (Yakubchuk et al., 2012).

The deposit is said to contain 4.2 Mt of Cu, 115 000 t Mo, 126 t Au and 795 t Ag in a resource of
    ~800 Mt @ 0.52% Cu, 0.014% Mo, 0.16 g/t Au, 1 g/t Ag.
Yakubchuk et al. (2012) quote resources of:
    928 Mt @ 0.52% Cu, 0.1 g/t Au

The most recent source geological information used to prepare this decription was dated: 2012.     Record last updated: 5/5/2015
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:
Berzina, A.N., Berzina, A.P. and Gimon, V.O.,  2016 - Paleozoic-Mesozoic Porphyry Cu(Mo) and Mo(Cu) Deposits within the Southern Margin of the Siberian Craton: Geochemistry, Geochronology, and Petrogenesis (a Review): in    Minerals   v.6,  doi:10.3390/min6040125
Berzina, A.N., Sotnikov, V.I., Economou-Eliopoulos, M. and Eliopoulos, D.G.,  2005 - Distribution of rhenium in molybdenite from porphyry Cu-Mo and Mo-Cu deposits of Russia (Siberia) and Mongolia : in    Ore Geology Reviews   v.26 pp. 91-113.
Kuzhuget, R.V., Ankusheva, N.N., Hertek, A.K., Kalinin, Y.A., Damdinov, B.B., Pirajno, F., Butanaev, Y.V., Suge-Maadyr, N.V. and Soldup, S.N.,  2023 - Precious-Metal Mineralization and Formation Conditions of the Biche-Kadyr-Oos Epithermal Au-Ag Ore Occurrence (Eastern Sayan, Russia): in    Minerals (MDPI)   v.13, 17p. doi.org/10.3390/min13121529.
Kuzhuget, R.V., Ankusheva, N.N., Khertek, A.K., Mongush, A.O. and Butanaeva, Yu.V.,  2024 - The Ak-Sug Porphyry Copper-Gold-Molybdenum Deposit, East Sayan: Noble Metal Mineralization, PT-Parameters, and Composition of Ore-Bearing Fluid: in    Geology of Ore Deposits (Pleiades Publishing)   v.65, pp. S58-S84. doi 10.1134/S1075701523070188.
Kuzhuget, R.V., Mongush, A.A. and Mongush, A.,  2018 - Evolution of chemical composition of fahlores of the Ak-Sug gold-molybdenum-copper-porphyry deposit (North-East Tuva): in    Bulletin of the Tomsk Polytechnic University Geo Assets Engineering,    v.329, pp. 81-91. Abstract in English, text in Russian.
Pollard, P.J., Pelenkova, E. and Mathur, R.,  2017 - Paragenesis and Re-Os Molybdenite Age of the Cambrian Ak-Sug Porphyry Cu-Au-Mo Deposit, Tyva Republic, Russian Federation: in    Econ. Geol.   v.112, pp. 1021-1028.
Seltmann, R., Soloviev, R., Shatov, V., Pirajno, F., Naumov, E. and Cherkasov, S.,  2010 - Metallogeny of Siberia: tectonic, geologic and metallogenic settings of selected significant deposits: in    Australian J. of Earth Sciences   v.57, pp. 655-706.
Sotnikov V I, Berzina A N, Economou-Eliopoulos M and Eliopoulos D G  2001 - Palladium, platinum and gold distribution in porphyry Cu±Mo deposits of Russia and Mongolia : in    Ore Geology Reviews   v18 pp 95-111
Yakubchuk, A., Degtyarev, K., Maslennikov, V., Wurst, A., Stekhin, A. and Lobanov, K.,  2012 - Tectonomagmatic Settings, Architecture, and Metallogeny of the Central Asian Copper Province: in Hedenquist J W, Harris M and Camus F, 2012 Geology and Genesis of Major Copper Deposits and Districts of the World - A tribute to Richard H Sillitoe, Society of Economic Geologists   Special Publication 16, pp. 403-432
Zvezdov V S, Migachev I F and Girfanov M M  1993 - Porphyry copper deposits of the CIS and the models of their formation: in    Ore Geology Reviews   v7 pp 511-549

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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