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Koktal

Xinjiang, China

Main commodities: Zn Pb Ag
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The Koktal volcanic hosted massive sulphide Zn-Pb deposit is located in the Southern Altay Mountains of Xinjian in western China (47° 21' 10"N, 89° 11' 54'E), 95 km souitheast of Aletai.

The deposit lies within the Devonian volcano-sedimentary Maizi basin. The host rocks to the ore are mainly metasedimentary units comprising schist, tuffaceous metasiltstone, marble and siliceous banded iron formation. These rocks are evenly distributed and range from 120 to 350 m in thickness between two volcanic layers and represent a pause in the volcanic activity. A suite of calc-alkaline volcanic rocks with felsic breccia, agglomerates and flows is found in the footwall of the ore deposit.

The Koktal deposit occurs as stratbound bodies underlain by disseminated and stringer/stockwork mineralization. Disseminated sulphides dominate the stratabound mineralisation, accompanied by lesser banded, massive and breccia ores. Semi-conformable alteration zones, dominated by potassium metasomatism and chloritisation, as well as an obvious alteration pipe, are recognized in the footwall rocks. It is interpretted to be similar to the Iberian Pyrite Belt deposits and represent a style intermediate between VHMS and shale-hosted massive sulphide deposits.

The deposit contains more than 3 MT@ 1.5 % Pb, 3.2% Zn, 0.08% Cu.

The most recent source geological information used to prepare this summary was dated: 2003.    
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:
Jingbin Wang, Yuwang Wang, Shulai Wang and Rufu Ding,  2003 - The Koktal Pb-Zn massive sulfide deposit: in Mao, Goldfarb, Seltmann, Wang, Xiao and Hart (Eds.), 2003 Tectonic Evolution and Metallogenesis of the Chinese Altay and Tianshan, Proceedings Volume of the International Symposium of the IGCI 473 Project in Urumqi and Guidebook of the Field Excursion in Xinjiang, China: August 9-21, 2003. IAGOD Guidebook Series 10: CERCAMS/NHM London,    pp 169-180
Pirajno, F., Seltmann, R. and Yang, Y.,  2011 - A review of mineral systems and associated tectonic settings of northern Xinjiang, NW China: in    Geoscience Frontiers   v.2, pp. 157-185.


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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