Wuner Pb-Ag-Mo Mine, Yakeshi City, Hulunbuir City (Hulunbei'er Prefecture), Inner Mongolia, Chinai

Regional Level Types
Wuner Pb-Ag-Mo Mine	Mine
Yakeshi City	County
Hulunbuir City (Hulunbei'er Prefecture)	Prefecture-level City
Inner Mongolia	Autonomous Region
China	Country

The stratigraphic units consist of the Upper Jurassic Manketouebo Formation (J3mk) and Lower Cretaceous Baiyin’gaolao Formation (K1b) from west to east. Upper Jurassic Manketouebo Formation volcanic–sedimentary rocks are composed of rhyolite, lithic crystal tuff, rhyolitic tuff, and volcanic breccia. Lower Cretaceous Baiyin’gaolao Formation volcanic–sedimentary rocks comprise rhyolite, dacite tuff, and volcanic breccia, yielding a zircon U-Pb age of rhyolite at 127.6 ± 1.2 Ma. The alteration and mineralization zone is hosted within the Upper Jurassic Manketouebo Formation. The Wunuer deposit can be divided into three ore blocks (I, II, III) from west to east. Ore blocks II and III are mainly associated with zinc–lead–silver mineralization, while Ore block I is primarily characterized by zinc–lead–molybdenum mineralization with the highest level of exploration and showing the most abundant geological phenomena. Based on the available exploration data, the I1 orebody of Ore block I exhibits the best and typical mineralization and the highest grade, making it the most significant rich orebody of the Wunuer deposit. The I1 orebody exposures in the Wunuer deposit are approximately 301.7 m long, 4 m wide, with a maximum extension of 281.7 m. They are hosted within the volcanic rocks of the Manketouebo Formation and related to the granite porphyry.
Late magmatic stage: mainly occurred at the top of the deep granite porphyry intrusion, forming vein-type molybdenum ores dominated by pyrite–molybdenite–quartz veins, always with K-feldspathization, silicification, sericitization, chloritization, magnetization, and hematitization.
Magmatic–hydrothermal transition stage: mainly occurred in the cryptoexplosion breccia hosted by granite porphyry intrusion and the volcanic–sedimentary rocks of the Manketouebo Formation. Breccia-type ore minerals during this stage comprise sphalerite–pyrite–quartz cement and wall rock (the Manketouebo Formation volcanic–sedimentary rocks composed of rhyolite and lithic crystal tuff) breccia.
Hydrothermal stage: vein-type Zn-Pb-Ag mineralization located in the ore-bearing fractured zone and cross-cutting the crypto-explosive breccia-type mineralization in the shallow position of this deposit. This stage formed stockwork, veined and massive Zn-Pb-Ag ores principally consisting of sphalerite, galena, chalcopyrite, and pyrite, always with kaolinization, illitization, carbonatation, and fluoritization.

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