Daqingshan Mountains Gold Province - Hadamengou, Saiyinwusu

Inner Mongolia, China

Main commodities: Au
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A series of orogenic style lode gold deposits on the ~1500 km long northern margin of the North China Craton extending from the middle of Inner Mongolia, through northern Hebei and Liaoning, to Jilin Province. Together they account for more than 900 tonnes (30 Moz) of gold.   The Daqingshan Mountains Gold Province represents the western section of this larger gold province and includes the Hadamengou and Saiyinwusu deposits. Hadamengou is located 20 km west of the city of Baotou.

The northern margin of the North China Craton is characterised by east-west trending basement uplift blocks of metamorphosed Archean and Palaeoproterozoic gneiss, schist, granulite, amphibolite and banded iron formation that have been episodically uplifted during Variscan, Indosinian, and Yanshanian tectono-magmatic events. Slightly metamorphosed Mesoproterozoic to Neoproterozoic shallow marine quartzite, slate and limestone, and Paleozoic to Cretaceous shallow marine to continental sedimentary rocks, surround the uplifts. Most of the deposits are hosted by uplifted blocks of Precambrian metamorphic rocks, although Palaeozoic and Mesozoic felsic plutons are commonly found in close proximity and host around 30% of the mineralisation.

Gold deposits and granites are associated with both Variscan and Yanshanian tectonism, although broad scale regional deformation is mainly Variscan and is best characterised by east-west striking folds and fault zones formed during Permian early stages of ocean closure between the North China and Angara cratons. Locally, in the eastern part of the gold province, the Variscan structures are overprinted by Yanshanian NNE trending strike slip faults. The Late Jurassic to Early Cretaceous Yanshanian tectonism could have been caused either by the oblique subduction of the Izanagi oceanic plate underneath the North China craton and/or final closure of the Mongolia-Okhotsk ocean between the Angara and North China cratons.

In the Daqingshan Mountain area mineralization, such as at the Hadamengou deposit, is controlled by secondary structures in Archaean basement rocks, related to the regional E-W striking folds and faults. The deposits are commonly are only a few kilometers from Variscan granites, hosted in high-grade metamorphic rocks, although no significant gold, has been discovered in the igneous rocks.

This Variscan mineralisation is characterized by pinkish K feldspar-quartz veins. Telluride minerals are common, and proximal alteration zones may contain in excess of 6% K20.

The Hadamengou deposit is hosted by Archaean metamorphics and contains over 60 t of Au at grades of 8 to 9 g/t Au and is associated with an east-west striking, 10 km long and 100 to 400 m wide mylonite zone exposed in the mine area. K feldspar-quartz veins, quartz veins, and altered rocks parallel the zone and the more regional east-west trending structures. Individual veins are normally 200 to 500 m long, but some extend for 3 km. They average 2 to 3 m in thickness, and have been mined to a depth of 400 m, with little change in ore grades.

A few tens of kilometers north of Hademengou, the Sayinwusu deposit is only a few kms south of the northern edge of the North China cratonhosted by Proterozoic metamorphic rocks. The combined resource of the Saiyinwusu and nearby Bayan Obo gold deposits (close to the large Bayan Obo REE-Nb-Fe mine) is >20 t Au with grades of 5 to 6 g/t Au.

Mineralisation at the Varican Hadamengou and Saiyinwusu deposits is association with abundant arsenic- and antimony-bearing sulphide phases, occurs in quartz veins and, less commonly, is disseminated in mylonitic volcanic rocks, along a series of east-west and NE trending, steeply-dipping shear zones.

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:
Hart C J, Goldfarb R J, Yumin Qiu, Snee L, Miller L G and Miller M L  2002 - Gold deposits of the northern margin of the North China Craton: multiple late Paleozoic-Mesozoic mineralizing events: in    Mineralium Deposita   v37 pp 326-351
Jin-Hui Yang, Fu-Yuan Wu, Wilde S A  2003 - A review of the geodynamic setting of large-scale Late Mesozoic gold mineralization in the North China Craton: an association with lithospheric thinning: in    Ore Geology Reviews   v23 125-152
Zhou, T., Goldfarb, R.J. and Phillips, G.N.,  2002 - Tectonics and distribution of gold deposits in China - an overview: in    Mineralium Deposita   v.37, pp. 249-282.

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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