Huangjindong As-Au deposit, Huangjindong goldfield, Pingjiang Co., Yueyang, Hunan, Chinai

Regional Level Types
Huangjindong As-Au deposit	Deposit
Huangjindong goldfield	Mining Field
Pingjiang Co.	County
Yueyang	Prefecture-level City
Hunan	Province
China	Country

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Turbidite-hosted arsenic-rich gold deposit.

The Huangjindong gold deposit is located to the southeast of the Changsha–Pingjiang fault. The proven gold reserve is 80 t, with an average grade of 5 g/t, including in Yangshanzhuang, Jinmei, Jintang, and other mining areas. The Xiaomuping Formation of the Neoproterozoic Lengjiaxi group is the main host rock, which can be divided into two sections, according to lithology. The first member consists of layered calcareous slates, carbonaceous slates, banded slates, metamorphic fine sandstones, and sericite slates. The second section is composed of layered sandy slates, silty slates, carbonaceous slates, spotted slates, phyllitic slates, and metamorphic fine-grained sandstones.
Orebodies in the Huangjindong gold deposit can be divided into three types, i.e., quartz veins, altered slates, and structure breccias. The first type of ore has a high grade, while the second type has large reserves and a relatively low grade. The hydrothermal activities related to mineralization in the Huangjindong deposit can be divided into five stages, which can be represented by the mineral assemblages of quartz (Q1)–carbonate, quartz (Q2)–scheelite, arsenopyrite–pyrite–quartz (Q3), poly-sulfide–quartz (Q4), and calcite–quartz (Q5).

As the most productive gold orebodies, Yangshanzhuang and Jintang contain 15 auriferous ore veins, with Au grades ranging from 0.83 to 28.77 g/t (avg. 4.03 g/t). Two ore veins (Vein 3 and Vein 202 ), with greater sizes and higher gold resources, were mining in these years. As the largest gold-bearing quartz vein in the Jintang orebody, Vein 3 is located near the northeast wing of the Diaobaojie overturned syncline and extends approximately 3300 m along the strike direction. Vein 3 has a strike direction of 70–100° and an average dip angle of 45°. Vein 3 has Au grades of 2.03–28.77 g/t with an average thickness of 1.78 m. Vein 202, which is the largest vein in the Yangshanzhuang orebody, is located at the north of Vein 3 and extends about 2220 m along the strike direction. Vein 202 strikes approximately in the EW direction and has a dip angle of 66–80°. According to the mining data, Vein 202 has Au grades of 1–9.06 g/t with an average thickness of 1.01 m.

This deposit comprises three ore segments: namely Jinmei, Jintang, and Yangshanzhuang. The exposed strata are primarily represented by the Dayaogu Formation of the Neoproterozoic Lengjiaxi Group, which comprises of silty, sandy, and sericitic slates. The shapes of these orebodies can be stratiform, vein-like, or lenticular. Their geometry varies considerably because of vein splitting and coalescence. A total of sixty-four orebodies have been delineated. Their lengths range from 75 to 1,200 m, thicknesses from 0.8 to 3.8 m, and depths from 30 to 1,200 m. the mineralization history is categorized into an early scheelite-gold mineralization epoch and a later wolframite mineralization epoch. The early mineralization epoch can be further categorized into three district stages: (I) quartz-scheelite-siderite-pyrite, (II) quartz-sericite, and (III) quartz-polymetallic sulfide-gold, whereas the latter epoch comprises a single mineralization stage, namely (L) ankerite-wolframite.

Commodity List

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Mineral List

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20 valid minerals.

Rock Types Recorded

Rock list contains entries from the region specified including sub-localities