Porphyry and vein-type copper-polymetallic deposit. The deposit consists of two ore blocks, Jinjiling and Kongqueshan. The mineralization in the Jinjiling block is of porphyry type, while the Kongqueshan ore bodies are of hypothermal vein-type. The latter are hosted in north-south-trending fractures in the outer contact zone of the Budunhua intrusive complex.

Recent exploration indicates Cu reserves of >0.16 ​Mt, with an average grade of 0.7 ​wt.%.
Strata exposed in the mining area are of the lower Permian Dashizhai, Middle Jurassic Wanbao, and Upper Jurassic Manketou’ebo formations. The metasandstone of the Dashizhai Formation is the dominant host rock of the Cu orebodies and has the widest distribution. The Jurassic unit unconformably overlies the Dashizhai Formation, cropping out in the southeastern part of the area. The Wanbao Formation consists of sandy conglomerate intercalated with tuffs, whereas the Manketou’ebo Formation comprises mainly rhyolite, rhyolitic tuff, and dacitic tuff. Intrusions in the deposit (referred to as the Budunhua complex) comprise predominantly concealed tonalite porphyry and exposed biotite granodiorite and granite porphyry.
About 30 stratiform-like and lenticular Cu orebodies have been delineated in the Jinjiling ore block. These concealed orebodies occur mainly in the outer contact zone between the tonalite porphyry and Dashizhai Formation, with no distinct boundaries between orebodies and country rocks. The orebodies strike NW and dip to the NE at 45°–60° and have lengths of 100–580 ​m, thicknesses of 2–15 ​m, and slope depths of 45–300 ​m. In the Kongqueshan ore block, 12 ore veins have been identified, spatially confined to N-trending fracture zones. The ore veins are 350–1100 ​m long, 160–350 ​m deep, and 1–3 ​m thick, with eastward dips of 65°–85°.
The hydrothermal period is the predominant and include four stages from early to late, as follows. Stage I is a quartz–K-feldspar stage, with pyrite and arsenopyrite in quartz–K-feldspar veins occurring mostly as euhedral–subhedral crystals. Stage II is characterized by a stockwork of quartz ​+ ​pyrite ​+ ​chalcopyrite ​+ ​pyrrhotite veins or veinlets. In stage III, quartz–polymetallic sulfide veins are characterized by abundant polymetallic sulfides such as pyrite, chalcopyrite, sphalerite, galena, and pyrrhotite ). Stages II and III are the principal Cu mineralization stages associated with local phyllic alteration. Stage IV marks the end of hydrothermal activity and is defined by veinlets of quartz and calcite, with minor pyrite, chalcopyrite, and siderite, that typically cut earlier-formed veins or veinlets.

Other Regions, Features and Areas containing this locality

References