Xichangjing W-Cu deposit, Ejin Banner (Ejina Co.), Alxa League (Alashan Prefecture), Inner Mongolia, Chinai

Regional Level Types
Xichangjing W-Cu deposit	Deposit
Ejin Banner (Ejina Co.)	County
Alxa League (Alashan Prefecture)	Prefecture
Inner Mongolia	Autonomous Region
China	Country

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The Xichangjing deposit, a recently discovered medium-sized tungsten deposit in the region, contains approximately 28,482.40 t of WO3 at an average grade of 0.1791%, together with 10,011.88 t of Cu at an average grade of 0.0630%. The Xichangjing deposit lies within the Yueyashan–Xichangjing ophiolitic mélange belt in the eastern part of the Gongpoquan arc. The deposit is mainly hosted by dense massive and vesicular basalts, as well as andesitic basalts, of the Middle Ordovician Xianshuihu Formation, which constitute the mineralized wall rocks. The mineralized zone is about 1000 m wide, and the tungsten orebodies are developed near the contact between Devonian–Permian granodiorite and Ordovician basalt. The main ore-hosting wall rocks are silicified basalt, while the footwall and hanging wall are composed of basalt or monzogranite. The orebodies dip at 35 ∼ 60° and commonly occur as parallel, echelon veins or lenticular bodies, often with internal xenoliths. Hydrothermal alteration comprises silicification, sericitization, chloritization, epidotization, and malachite staining, of which silicification is most closely associated with tungsten mineralization. The ores mainly show sparse disseminated, spotted disseminated, and thin veinlet-disseminated textures, and their structures are dominated by semi-euhedral granular and anhedral granular forms. mineralization at the Xichangjing deposit can be divided into three stages. (1) Stage I is the magmatic stage and is characterized by a high-temperature mineral assemblage dominated by amphibole, intermediate plagioclase, pyrite, chalcopyrite, and pyrrhotite. (2) Stage II represents the hydrothermal stage and forms the main mineralization episode. The ore minerals in this stage include scheelite, wolframite, pyrite, chalcopyrite, galena, sphalerite, molybdenite, and pyrrhotite, whereas quartz and carbonates are the main gangue minerals. This stage reflects medium to high-temperature hydrothermal mineralization. (3) Stage III is the supergene stage and is marked by minor quartz and carbonates, together with secondary minerals such as malachite.

Commodity List

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

Mineral List

14 valid minerals.

Rock Types Recorded