Batailing Au deposit, Changyi District, Jilin, Jilin, Chinai

Regional Level Types
Batailing Au deposit	Deposit
Changyi District	District
Jilin	Prefecture-level City
Jilin	Province
China	Country

The exposed strata in the mining area consist of the Lower Permian Fanjiatun and Upper Permian Yangjiagou Formations. The strata generally trend NE and dip at 40–60°. The Lower Permian Fanjiatun Formation, situated in the south-eastern sector of the Batailing Au deposit, consists of andesitic conglomerate, sandstone, andesite, andesitic tuff, and breccia tuff. Moreover, the Lower Permian Fanjiatun Formation has undergone low-level regional metamorphism, with visible silty metamorphic and metamorphic fine sandstone. The Upper Permian Yangjiagou Formation, situated in the north-western sector of the mining area, consists of black carbonaceous slate, phyllite, hornblende andesite, meta-andesite, and argillaceous sandy silty slate. The orebodies predominantly occur within the Yangjiagou Formation.
Seven vein-type orebodies have been identified; they can be divided into three ore zones (No. 1, No. 2, and No. 3) from west to east. These orebodies mainly occur in the Yagjiagou Formation (No. 1 and No. 2) and are partly developed in the quartz diorite–porphyrite (No. 3). These NE-trending orebodies dip NW at 40–65°. The lengths and widths of the orebodies are 40–800 m and 0.5–2 m, respectively. The main orebody (2.5 t Au, average grade of 3.78 g/t; 143.7 t Ag, average grade of 194.38 g/t) in the No. 2 ore zone dips SE at 45–65° within this ore zone and measures approximately 800 m long and 0.3–4.7 m thick.
Hydrothermal alterations within the Batailing Au deposit are widely exhibited. The intensity and type of the alteration are related to the lithology of surrounding rock and the distance from the orebodies. The alterations gradually weaken outwards from the central orebodies and show certain zoning: strong silicification zones, silicification–sericitisation zones, sericitisation-chloritisation zones, and rare potassic alteration zones. Carbonatisation is widely distributed in the hanging wall of orebodies or inside and outside the orebody in the form of net veins. Divided into three mineralisation stages in the Batailing Au deposit: quartz–arsenopyrite–pyrite (stage I), quartz–polymetallic sulphides (stage II), and quartz–pyrite–carbonate (stage III).

Other Regions, Features and Areas containing this locality

References