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Kyzyl Tashtyg |
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Siberia - Tuva, Russia |
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Zn Au Ag Cu Pb
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Super Porphyry Cu and Au
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The Kyzyl-Tashtyg group of polymetallic Zn-Pb-Cu-Au-Ag and pyrite deposits is located to the SW of the Siberian craton, just to the north of the town of Kyzyl, ~500 km SSE of Krasnoyarsk, and 700 km west of Irkutsk, in the republic of Tuva, southern-central Siberia in the Russian Federation (#Location: 52° 1' 4"N, 95° 35' 8"E).
During the late Neoproterozoic, the Meso- to Neoproterozoic (Riphean) passive margin to rift basin Baikalide sequences on the margin of the Siberian craton underwent tectonic inversion. Subsequently, latest Neoproterozoic to early Palaeozoic subduction related processes initiated the intraoceanic Tuva-Mongol arc to the south of the craton and back-arc rifting along an incipient spreading centre between the craton and arc.
The Kyzyl-Tashtyg deposits are hosted by a Lower Cambrian sequence of volcanic and volcano-sedimentary rocks, including numerous sill-like mafic and felsic subvolcanic bodies and small porphyry intrusions, within the back-arc basin to the Tuva-Mongol arc. These volcanic rocks belong to a differentiated basalt-andesite-dacite suite. Sedimentary rocks are minor and include carbonaceous-siltstone, sandstone and limestone (Seltmann et al., 2010).
Three stratigraphic units are distinguished in the deposit area (Seltmann et al., 2010):
i). a lower, essentially basaltic member,
ii). an intermediate succession of alternating cherty siltstone, sandstones, andesite-basalt and dacite tuffs, and
iii). an upper suite, composed of andesite-basalts and intermediate tuffs.
Mineralisation is hosted in the intermediate unit, within a local palaeovolcanic depression rimmed by extrusive volcanic domes. The depression extends over a strike length of ~2 km and is 600 to 800 m wide. A total of at least 51 orebodies are known, 33 of which are predominantly Zn-Pb, 9 of Cu and 9 of pyritic ore. The host rocks and sub-concordant orebodies dip steeply at 70 to 80°, with some flattening to 40 to 50°. The orebodies have lenticular and stock-like shapes, and extend for tens to as much as 600 m along strike, and vary in thickness from 3 to 60 m (Seltmann et al., 2010). Ore samples contain 3.8% Ba; 2.8 kg/t As, 100 g/t Sb, 312 g/t Cd, 15 g/t Bi (USGS Mineral Resource database).
The volcanogenic-sedimentary massive sulphide mineralisation consists of thick and thin-bedded fragmental and diagenetic concretionary varieties formed during prolonged submarine volcanic activity from multiple vents controlled by faults (Kuzebnyy et al., 1990).
The group of deposits has a combined reserve of 12.9 Mt of ore containing 1.295 Mt Zn, 0.202 Mt Pb, 0.082 Mt Cu, 663.8 t Ag, 15.4 t Au at grades of 10.02% Zn, 1.57% Pb, 0.64% Cu, 2.7 to 121 g/t Ag, 0.2 to 2.5 g/t Au (from Zijin Mining Group website, www.zjky.cn and USGS Mineral Resource database mrdata.usgs.gov/vms in 2013).
The most recent source geological information used to prepare this decription was dated: 2010.
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.
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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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