Buziwan Mine (Puziwan Mine; Boziwan Mine; Baoziwan Mine; Poziwan Mine), Yanggao County, Datong, Shanxi, Chinai

Regional Level Types
Buziwan Mine (Puziwan Mine; Boziwan Mine; Baoziwan Mine; Poziwan Mine)	Mine
Yanggao County	County
Datong	Prefecture-level City
Shanxi	Province
China	Country

Mesothermal-epithermal gold deposit, hosted in cryptoexplosive breccias along the Dawuyao-Huyao shear fault zone.

The Buziwan deposit is primarily underlain by Precambrian basement rocks of mafic granulites, which are locally overlain by Quaternary deposits. The Jiuduigou – Huyao fault zone is the primary ore-controlling structure in the deposit area. The breccia pipe at the Buziwan deposit has an approximate length of 1.8 km, is 80–250 m wide, and dips 70°-75° to the south. In plan view, the pipe exhibits an elongated geometry, and in cross-section, it is wedge-shaped, narrowing with depth. The breccia exhibits distinct spatial zoning of clast type: granulite clasts are dominant near the margins and in the upper portions of the pipe, whereas monzogranite and quartz porphyry clasts are more abundant in the core and lower portions. Clast morphology ranges from angular to subrounded, with sizes varying from a few centimeters to several meters. Gold orebodies at the Buziwan deposit are primarily hosted within the breccia pipe, which generally trends E-W (80°–90°) and dips steeply (70°–90°) to the south. Individual orebodies exhibit complex geometries, characterized by branching, expansion, contraction, and repetition along strike and dip. These orebodies are predominantly hosted within secondary strike-slip fault zones and associated high-permeability zones within the breccia pipe. Three principal orebodies have been delineated, containing a combined reported reserve of over 12 tons of gold and an average grade of 6.93 g/t Au. The No. 1 ore body, the largest and economically most significant, is located centrally within the breccia pipe and accounts for approximately 87 % of the deposit’s total gold reserves. The eastern segment of the No. 1 orebody averages 21.46 m in true thickness, extends for approximately 200 m along strike, and has an average gold grade of 7.74 g/t Au. In contrast, its western segment is thinner (average true thickness 7.93 m), has an average gold grade of 5.75 g/t Au, a strike length of approximately 300 m, and extends to a vertical depth of about 350 m. Gold mineralization at the Buziwan deposit can be divided into three main paragenetic stages: (1) an early quartz-pyrite-sericite stage, (2) a main-ore quartz-sericite-pyrite-chalcopyrite-monazite and polymetallic sulfide stage, and (3) a late carbonate-pyrite stage.


Note: Although frequently reported as "Puziwan" or "Poziwan", the Chinese name of the deposit transliterates to "Buziwan".

Other Regions, Features and Areas containing this locality

References