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Irtyshsky, Irtyshskoe

Kazakhstan

Main commodities: Cu Zn Au Ag Pb
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Irtyshsky (or Irtyshskoe) is a volcanic hosted massive sulphide deposit of the Rudny Altay Volcanic Arc of eastern Kazakhstan. The deposit is ~80 km WSW of Ridder in the vicinity of the city of of Oskemen (precise location uncertain).

Mining commenced in 1952, and was rehabilitated from 1999 to be brought into production again in 2001.

For details of the geology of the Rudny Altay Volcanic Arc, see the record for the nearby Berezovskoe / Belousovskoe Ore Field.

Mineralisation occurs in a series of lenses with extensive strike length but limited down-dip extent. The resource is contained within three main lenses, as follows: Main - 2500 x 750 x 3.5 m; South East - 3000 x 400 x 75 m; and No. 2 - 1600 x 300 x 1.35 m.

These orebodies strike NW-SE, dip at 70 to 80° and plunge shallowly to the NW, with roughly parallel long axes. They are gently folded with thickening in the fold axes. Copper and zinc grades increase with depth.

Mineral resources remaining as at 1 January, 2011 were (IMC Group Consulting Ltd, 2011. Competent Persons Report to Kazakhmys Plc):
    Measured resource - 7.833 Mt @ 1.98% Cu, 5.47% Zn, 0.33 g/t Au, 73.02 g/t Ag, 0.78% Pb;
    Indicated resource - 4.326 Mt @ 2.06% Cu, 3.99% Zn, 0.31 g/t Au, 72.29 g/t Ag, 0.63% Pb;
    TOTAL resource - 12.159 Mt @ 2.01% Cu, 4.94% Zn, 0.32 g/t Au, 72.76 g/t Ag, 0.73% Pb;
Ore reserves (same date and source - included in resource - Note reserves exceed resources ?)
    TOTAL reserve - 16.988 Mt @ 1.37% Cu, 3.36% Zn, 0.22 g/t Au, 49.48 g/t Ag, 0.49% Pb.

This summary is drawn from the limited information in IMC Group Consulting Limited, 2011. Competent Persons Report on the Mining Assets of Kazakhmys Plc, Kazakhstan and Kyrgyzstan, Appendix III, 342p.

The most recent source geological information used to prepare this summary was dated: 2012.    
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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