GMRAP ID | 454 |
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Alternate names | Bajan-Ula, Bayan-Uul 2 |
Tract name | Mongol-Altai (142pCu8507) |
Site status | prospect |
Country | Mongolia |
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State or province | Töv |
Geographic location | 104.8833, 46.6833 |
Geologic map unit | 104.8833, 46.6833 |
Nearby data |
Deposit type | Porphyry copper |
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Age (Ma) | 222Ma |
Age determination method | K-Ar biotite |
Age range | 222.0 ±2.1 Ma; 222.4 ±2.2 Ma |
Age reference | Lamb and Cox (1998) |
Minerals | actinolite, albite, biotite, bornite, carbonate, chalcocite, chalcopyrite, chlorite, covellite, epidote, fahlore, galena, galenobismutite, hematite, kaolinite, magnetite, malachite, marcasite, molybdenite, montmorillonite, muscovite/sericite, pyrite, pyrophyllite, pyrrhotite, rutile, sphalerite, tourmaline |
Associated rocks | andesite porphyry, breccia, granodiorite porphyry, quartz monzodiorite porphyry, quartz syenite porphyry,n.d.,andesite dike, andesitic trachybasalt, granite, granodiorite, trachyandesite, tuff-breccia, tuff-conglomerate, tuffaceous sandstone, tuffaceous volcanic-plutonic system, porphyritic diorite to granite |
Tectonic setting | continental margin |
Stratigraphic age | Late Triassic |
Development status | Prospect |
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Major commodities | Cu, Mo |
Minor commodities | Au |
Gold-Moly ratio | -9999 |
Comments | An area 0.6 by 2.3 km, >0.1% Cu, >0.002% Mo, >0.1 g/t Au. A zone 300 by 900 m contains >0.3 weight percent Cu and 0.005 weight percent Mo. Abundant quartz-tourmaline-chalcopyrite veins and quartz-tourmaline breccias (Lamb and Cox, 1998); exposed; a 39Ar/40Ar isotopic age is 220233 Ma (Late Triassic) from Nokleberg and others (2003). Alteration zone is nearly oval, is 3 km wide and extends northeast for 5 km. The dominance of sericite, advanced argillic, silica alteration at the surface suggests a relatively shallow porphyry Cu system. The deposit consists of stockwork veinlets and veins of quartz, pyrite, chalcopyrite, and molybdenite that occur in or near porphyritic intrusions. High-level intrusive porphyry is contemporaneous with abundant dikes, faults, and breccia pipes. Hosted in a Jurassic volcanic-plutonic system that includes small porphyritic intrusions of diorite to granite from Nokleberg and others (2003). |
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Study area name | Central Asian Orogenic Belt |
References | Koval and others (1988); Koval and others (1989); Lamb and Cox (1998); Nokleberg and others (1999); Nokleberg and others (2003); Sillitoe, Gerel, and others (1996); Singer and others (2008); Kirkham and Dunne (2000); Dejidmaa and others (2002) |
Site reference | Mihalasky, Ludington, Hammarstrom, and others (2015) |