Hubei, China

Main commodities: Au Cu
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The Tonglushan skarn Au-Cu deposit is located within the Yangtze Valley Gold Province of eastern China, in Hubei Province, approximately 200 km WNW of Nanchang.

This deposit lies within the Edong Mining District of Middle to Lower Yangtze River Valley Metallogenic Belt on the northern margin of the Yangtze craton. For more detail on the regional setting see the Yangtze River Belt record.

The Yangtze Valley Gold Province lies within the Yangtze River Trough which was developed on the eastern margin of the Yangtze Craton. The trough is composed of Mesozoic fault-bounded volcanic basins, with mainly 135-127 Ma felsic to intermediate volcanic rocks of the Yangtze Igneous Group emplaced along the basin margins and as zones of uplift within the basin. This tectonism is interpreted to be the result of back-arc, post-collisional extension that occurred subsequent to amalgamation of the North and South China cratons, and during subduction of oceanic plates beneath eastern China.

Tonglushan is located at the westernmost end of Yangtze Valley Gold Province.

The Late Jurassic to Early Cretaceous 157 to 137 Ma Tonglushan porphyritic quartz-monzodiorite was emplaced into Triassic dolomitic limestones within the southern limb of an anticlinorium. Mineralisation is concentrated at the intersections of NW , NNE and ENE striking faults with the fold to form three ore zones. The major ore zone dips subvertically and covers an area of about 2100 x 300 to 350 m.

Mineralisation occurs as massive or disseminated sulphides associated with retrograde alteration mainly within skarn, with minor mineralisation formed along the margins of the intrusion and within the surrounding marbles. The main ore phases comprise chalcopyrite, bornite, pyrite, magnetite, hematite, chalcocite, molybdenite, sphalerite, gold and tennantite. The principal gangue assemblages include diopside, garnet, calcite, dolomite, quartz, phlogopite, epidote, white mica, chlorite, serpentine, tremolite, actinolite and plagioclase. Gold is associated with sulphide minerals and quartz, commonly occurring as inclusions in pyrite and chalcopyrite.

Tonglushan is reproted to contain 69 t of Au and 1.1 Mt Cu at grades averaging 1.2 g/t Au, >1% Cu.

The most recent source geological information used to prepare this summary was dated: 2002.    
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:
Zhang, S., Chu, G., Cheng, J., Zhang, Y., Tian, J., Li, J., Sun, S. and Wei, K.,  2020 - Short wavelength infrared (SWIR) spectroscopy of phyllosilicate minerals from the Tonglushan Cu-Au-Fe deposit, Eastern China: New exploration indicators for concealed skarn orebodies: in    Ore Geology Reviews   v.122, 20p. doi.org/10.1016/j.oregeorev.2020.103516
Zhao, H., Xie, G., Wei, K. and Ke, Y.,  2011 - Mineral compositions and fluid evolution of the Tonglushan skarn Cu-Fe deposit, SE Hubei, east-central China: in    International Geology Review   v.54, pp. 737-764.

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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