Tsagaankhairkhan Cu–Au mining area, Tonkhil District, Govi-Altai Province, Mongoliai

Regional Level Types
Tsagaankhairkhan Cu–Au mining area	Mining Area
Tonkhil District	District
Govi-Altai Province	Province
Mongolia	Country

The Tsagaankhairkhan copper–gold mining area contains metamorphic–volcanic rocks and terrigenous sedimentary rocks ranging from the Riphean to the Permian, as well as rocks of various ages and compositions, including subvolcanic formations from the Early Cambrian, Late Devonian, and Middle Permian, granitoid rocks of the Middle–Late Cambrian Togtoh Group, Early Carboniferous diorite, and Middle Permian syenite. The strata distributed around the mining area include various types such as sedimentary rocks, volcanic layers, and metamorphic layers, spanning a geological time frame from the Neoproterozoic Cambrian system to the present day. This mining area is located in the eastern section of the Central Asian Orogenic Belt (CAOB), featuring four types of copper–gold metallogenic systems: porphyry, skarn, epithermal, and orogenic types. The porphyry-type system is concentrated in the fine vein mineralization within the late Devonian granite diorite body, while the epithermal-type system exhibits stockwork-style gold–silver mineralization in fractures of the Late Devonian andesite. The skarn-type system involves copper–gold enrichment at the contact zone between Cambrian rock masses and Cambrian limestone, and the orogenic-type system is represented by gold veins within the Ordovician–Silurian metamorphic rock ductile–brittle shear zones.

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