Demingding Mo-Cu deposit, Gyaca Co. (Jiacha Co.), Shannan Prefecture (Lhokha Prefecture; Lhoka Prefecture), Tibet, Chinai

Regional Level Types
Demingding Mo-Cu deposit	Deposit
Gyaca Co. (Jiacha Co.)	County
Shannan Prefecture (Lhokha Prefecture; Lhoka Prefecture)	Prefecture
Tibet	Autonomous Region
China	Country

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The Demingding porphyry Mo-Cu deposit, located in the eastern part of the Gangdese magmatic belt, boasts proven reserves of 0.5 million tons (Mt) of molybdenum with a grade of 0.14%, and over 0.5 Mt of copper with an average grade of 0.26%. The magmatic units at the Demingding deposit consist of ore-forming and barren monzogranite porphyries, which intrude into Jurassic volcanic and intrusive rocks, specifically the Yeba Formation, rhyolite porphyry, and volcanic breccia. The monzogranite porphyries are exposed only in a limited surface area; however, its concealed portion exhibits a lens-like texture oriented east–west, measuring approximately 2.1 km in length and 100 to 400 m in width. Drill core logging has identified three Mo-Cu bodies and one Mo body at the Demingding deposit, with mineralization predominantly occurring in quartz veins and only rarely disseminated in the monzogranite porphyries and wall rocks.

With resources of >0.5 Mt at 0.26% Cu and >0.5 Mt with 0.14% Mo, it is considered a medium- to large-sized Mo-Cu deposit and is primarily enriched in Mo. The exposed strata in the area are predominantly the Lower Jurassic Yeba Formation, composed mainly of dacitic welded tuff and rhyolitic or andesitic vitric tuff. The granite porphyry, serving as the main ore-bearing intrusion, along with the Early Jurassic rhyolite porphyry, intrudes the Lower Jurassic Yeba Formation. Data from the Demingding deposit indicate two engineered Mo-Cu mineralized bodies in the area. Mineralized Body I is elliptically shaped with a NE-trending long axis extending approximately 520 m and a short axis of about 220 m. Mineralized Body II, exposed at the surface, exhibits an elliptical shape with a NW-trending long axis of about 220 m and a short axis of approximately 100 m. Both bodies are dominated by molybdenum mineralization, with minor copper mineralization. The ore-bearing rock is granite porphyry. The metallogenic stages of the Demingding Mo-Cu deposit are divided into three stages: (1) Quartz-Pyrite Stage: The main mineral assemblage includes quartz, sericite, chlorite, pyrite, and chalcopyrite. Metallic minerals are mainly distributed in a disseminated form. (2) Quartz-Polymetallic Sulfide Stage: This is the main ore-forming stage. The primary mineral assemblage consists of quartz, pyrite, chalcopyrite, molybdenite, sphalerite, azurite, etc. Metallic minerals mainly occur as veinlet-disseminated to vein-type mineralization. (3) Carbonate Stage: This stage primarily forms minerals such as calcite and sericite.

Commodity List

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

Mineral List

14 valid minerals.

Rock Types Recorded