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Tuanjiegou

Heilongjiang, China

Main commodities: Au Cu
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The Tuanjiegou epithermal gold deposit, is located about 400 km NNE of the city of Harbin in Heilongjiang, only 40 km from the Russian border.

The deposit lies between a local Mesozoic graben and a Proterozoic basement uplift. Mineralization is hosted in a subvolcanic granitic porphyry that was emplaced into a Mesozoic caldera, that is in turn localised by the intersection of NNE- and east-west trending structures.

Tuanjiegou has been interpreted to be a subvolcanic porphyry, although its mineral assemblages, alteration styles and ore textures are all characteristic of typical epithermal systems.

Gold mineralisation is predominantly disseminated in breccia within or along the margins of the Cretaceous 113 to 92 Ma (Yanshanian) host rhyolitic porphyry. The intruded country rock comprises Cretaceous volcanic rocks overlying Proterozoic basement.

The major orebodies strike WNW and dip 40 to 50°N. They are 250 to 725 m long, 11 to 68 m thick, and have been traced to depths of between110 and 375 m.

The principal ore minerals are pyrite and marcasite with lesser stibnite, chalcopyrite, galena, cinnabar, realgar and orpiment. Alteration minerals are characterized by low temperature assemblages of chalcedony, adularia, opal, ankerite, calcite and kaolinite. Gold is dominantly associated with pyrite and chalcedony.

The deposit is reported to contain >60 t of Au at grades of 7.5 g/t Au.

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.
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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at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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