Haoyaoerhudong Au deposit, Urad Middle Banner (Wulate Zhongqi), Bayannur City (Bayannao'er Prefecture), Inner Mongolia, Chinai

Regional Level Types
Haoyaoerhudong Au deposit	Deposit
Urad Middle Banner (Wulate Zhongqi)	County
Bayannur City (Bayannao'er Prefecture)	Prefecture-level City
Inner Mongolia	Autonomous Region
China	Country

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Meso-hypothermal gold deposit. The largest carbonaceous metasediment-hosted gold deposit on the north margin of the North China craton.
This gold deposit was discovered in 1992 and was explored from 1999 to 2012, resulting in a resource of 5.05 Moz (157.6 t) Au at an average grade of 0.60 g/t, with an additional inferred resource of 2.3 Moz Au at 0.46 g/t.
The orebodies occur along the southeast limb of the tight syncline and extend along the sinistral ductile-brittle shear zone (F1). These orebodies are defined by the economic cutoff grade for mining, i.e., 0.50 g/t. They are cut by the F2 fault, which divides the deposit into east and west blocks. Orebodies in the east block mainly dip to the northwest at about 75° to 85°, corresponding to sheared strata of the Bilute Formation. The E2 orebody from the east block is the biggest of the 49 orebodies, containing about 0.9 Moz gold at an average grade of 0.83 g/t. Andalusite schist with intercalated slate-phyllite layers occurs on the hanging wall. Two-mica quartz schist hosting the E2 orebody occurs on the footwall side. Gold mineralization is mainly developed in quartz-sulfide veins and altered schist, where hydrothermal alteration zones only extend for several decimeters.
Gold mineralization is concentrated in quartz-biotite ± sulfide veins (V1), quartz-sulfide stringers (V2), and altered two-mica schist. The bedding- and shearing-parallel V1-type veins are up to 50 cm wide and were folded or sheared during formation, suggesting they formed in a syndeformational, contractional environment. Three stages of hydrothermal activity have been identified at Haoyaoerhudong, including the syn-ore quartz-biotite-sulfide stage (I), quartz-sulfide stage (II), and post-ore quartz-calcite stage (III).

It is the second largest gold deposit hosted in black slate, phyllite, and schist in the north margin of the North China Craton (NCC). It is located along the eastern part of the CAOB, containing over 7 million ounces (Moz) of gold at with average grade of 0.62 ​g/t Au. The Haoyaoerhudong gold deposit extends in excess of 3000 ​m long, 50–200 ​m wide. Two ore blocks were separated by the F6-2 and termed the northeast and southwest ore block, respectively. The northeast ore block is 1900 m long, 200 ​m wide, and 700 ​m deep, accounting for 86% of the gold reserve in the deposit. A total of 44 economic ore bodies make up the Haoyaoerhudong gold deposit, of which 7 ore bodies contain more than 500 ​kg of Au. The orebodies occur mainly as lenses or are tabular in shape. In comparison, the northwest ore block contains less pyrrhotite than the northwest ore block. The Haoyaoerhudong gold deposit consists dominantly of disseminated pyrite, bedding-parallel pyrite/pyrrhotite veins, and pyrite-quartz veins, as well as minor barren quartz veins.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

25 valid minerals.

Rock Types Recorded