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Jiapigou, Erdaogou, Sandaocha, Bajiazi, Banmiaozi, Xiaobeigou, Miaoling, Erdaodianz, Haigoui

Jilin, China

Main commodities: Au Ag
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The Jiapigou gold field in southern Jilin Province, China, is located on the easternmost portion of the northern margin of the North China Craton (NCC). It is one of the most important gold-producing districts in China, having been responsible for nearly half of Chinas gold production during the 1960s and has a current estimated remaining resource of >100 t Au.

Gold deposits in the Jiapigou area are hosted by Archaean metamorphic rocks. These deposits are directly hosted by a shear zone and fault system that defines the boundary between the NCC and its bounding orogenic belt to the northeast. They lie within several ductile shear zones cutting late Archean gneissic tonalite, trondhjemite, and granodiorite (TTG) and amphibolite (2523±6 Ma), which have been retrogressed to greenschist facies. The deposits occur as massive auriferous quartz veins that contain sulphides (<10 vol.%) and less commonly disseminated- and stockwork-style mineralisation. The lodes are characterised by high Au/Ag ratios and relatively higher Cu (up to 1.3%) and Pb (as much as 10.3%) contents than most other gold deposits in the NCC. While phyllic assemblages are the most alteration style, potassic and chloritic alteration characterises felsic and mafic host rocks, respectively.

No major intrusions are recorded in the in the Jiapigou gold field, although felsic, alkaline and mafic dykes are common, usually occupying the same fault system as the gold lodes. Dykes also locally host gold mineralisation. Zircon SHRIMP U-Pb dates on pre-ore dykes yield ages of around 220 Ma, constraining the maximum age of gold mineralisation, whereas 40Ar/39Ar dates on hydrothermal sericite give an age of approximately 204 Ma suggesting a late Triassic gold-forming event. This timing is coeval with, or slightly later than, the post-orogenic magmatism that followed the final orogenesis of the Inner Mongolian-Daxinganling orogenic belt (IMDOB), which bounds the NCC to the north, suggesting that a post-orogenic tectonic setting is appropriate for the late Triassic gold mineralisation.

More than 20 gold deposits and occurrences have been delineated in the Jiapigou area. Of these the largest are:

Jiapigou with >40 t of Au at grades of 7 to 26 g/t Au, hosted by Archean amphibolite and gneiss with associated aplitic, syenitic, and dioritic dikes. Mineralisation occurs as quartz-sulphide veins hosted in NEE-trending ductile shear zone(s) containing lenticular and tabular orebodies which strike at 60-70° and dipp at 20-40° NW over lengths of 90-730 m, up to 17 m wide, and with down-dip extents of 50-670 m. The mineral assemblages include - quartz, chlorite, sericite and calcite with native gold, pyrite, chalcopyrite, galena, sphalerite, magnetite, pyrrhotite, wolframite and scheelite.

Erdaogou with >20 t of Au at grades of 6 to 19 g/t Au, hosted by Archean amphibolite and TTG rocks with associated Archean potassic granite, granodioritic and quartz-dioritic, dioritic, and lamprophyric dykes. Mineralisation occurs as quartz-sulphide veins and/or disseminated mineralisation, hosted in NW-striking shear zones. The major ore bodies strike 5-10° and dip at 55-70°SE, varying from 50 to 350 m in length, from 0.4 to 5.2 m in width and from 80 to 500 m in down-dip extent. The mineral assemblages include - quartz, chlorite, sericite and barite with native gold, pyrite, chalcopyrite, galena, sphalerite, magnetite, scheelite, argentite and pearceite.

Sandaocha with >45 t of Au at grades of 10 to 26 g/t Au, hosted by Archean amphibolite and TTG rocks with associated dioritic, quartz-syenitic, and lamprophyric dykes. Mineralisation occurs as NNE-trending shear zone-hosted gold-bearing quartz veins striking 15-30° and dipping 80-85°SE. Orebodies vary from 50 to 330 m long, from 1.3 to 3.2 m wide, and from 100 to 300 m in down-dip extent. The mineral assemblages include - quartz, chlorite, sericite and calcite with native gold, pyrite, chalcopyrite, galena, sphalerite, magnetite, bismuthinite and scheelite.

Bajiazi with >20 t of Au at grades of 9 to 37 g/t Au, hosted by Archean tonalitic gneiss and amphibolite with associated quartz-syenitic, dioritic, and diabase dykes. Mineralisation occurs as gold-bearing quartz veins hosted by NE-trending shear zones which are >2.5 km long and 5-12 m wide. Tabular orebodies strike at 50-60° and dip 70-80°SE, varying from 50 to 320 m in length, from 0.2 to 1.7 m in thickness and are from 30 to 240 m in down-dip extent. The mineral assemblages include - quartz, chlorite, sericite, ankerite and calcite with native gold, pyrite, galena, chalcopyrite, sphalerite and scheelite.

Banmiaozi with >15 t of Au at grades of 5 to 30 g/t Au, hosted by Archean TTG gneiss and amphibolite with associated dioritic, granodioritic, syenitic, granitic, diabase and lamprophyre dykes. Mineralisation occurs as EW-striking shear zones or faults which host the quartz-veins and disseminated alteration ores. Orebodies strike at 275-295° and dip 60-85°SW, varying from 18 to 370 m in length, from 0.05 to 7 m in width and from 50 to 355 m in down-dip extent. The mineral assemblages include - quartz, chlorite, sericite and calcite with native gold, pyrite, chalcopyrite, specularite, magnetite, galena, hematite and malachite.

Xiaobeigou with 10 t of Au at grades of 17 g/t Au, hosted by Archean amphibolite and TTG rock with associated syenitic, dioritic, diabase and lamprophyric dykes. Mineralisation occurs as disseminated- and stockwork-style and quartz-vein-style gold ores are hosted in NW-trending shear zone(s). Orebodies, strike at 320-330° and dip 65-75°NE. They vary from 30 to 100 m in length and from 0.1 to 3.3 m in width. The mineral assemblages include - quartz, chlorite, sericite and calcite with native gold, pyrite, chalcopyrite, magnetite, galena, sphalerite, scheelite, wolframite, specularite, hematite, pyrrhotite and bismuthinite.

Miaoling with >25 t of contained Au at an average grade of 3.2 g/t Au, hosted by Archean TTG gneiss and amphibolite with associated granodioritic, and dioritic dykes. Mineralisation occurs as disseminated- and stockwork-style gold hosted by NW- to NNW-trending shear zones. Major orebodies, strike at 330-340° and dip 55-65°NE. They are up to 400 m long, 0.4-7 m wide, with a down-dip extent of 50-210 m. The mineral assemblages include - quartz, chlorite, sericite and calcite with native gold, pyrite, chalcopyrite, sphalerite, magnetite, galena and hematite.

Erdaodianzi with >40 t of Au at grades of 8-15 g/t Au, hosted by Late-Palaeozoic metamorphic rocks of the Hulan Group with associated biotite granite and granodiorite, as well as felsic dykes. Mineralisation occurs as quartz veins hosted in NW- to N-striking faults in Palaeozoic metamorphic rocks. Individual lodes range from 55 to 150 m in striking length and 1.9 m in average width. The mineral assemblages include - quartz, sericite, chlorite, calcite and feldspar with native gold, arsenopyrite, pyrite, sphalerite, galena, chalcopyrite and marcasite.

Haigou with >30 t of Au at grades of 21 g/t Au, hosted by granodiorite with granodiorite and felsic dykes. Mineralisation occurs as quartz veins hosted in NE-striking faults within the Haigou granodiorite (a component of the huge Huangnihe granitic batholith). The main lode is up to 930 m long and as wide as 18 m, with a down-dip extent of 300 m, striking 20-40° and dipping at 40-75°NW. The mineral assemblages include - quartz, sericite, calcite and barite with native gold, pyrite, galena, sphalerite, chalcopyrite, bornite, marcasite, uraninite and pitchblende.

For a broader context see the Changbaishan Mountains Gold Province record.

For further information consult the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 2005.    
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:
Laicheng Miao, Yumin Qiu, Weiming Fan, Fuqin Zhang and Mingguo Zhai  2005 - Geology, geochronology, and tectonic setting of the Jiapigou gold deposits, southern Jilin Province, China: in    Ore Geology Reviews   v26 pp 137-165


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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