Ormiin Tsagaan nuur

Porphyry copper prospect in Bulgan, Mongolia

Names and other identifiers

Tract name Erdenet (142pCu8508a)
Site status prospect

Geographic location

Country Mongolia
State or province Bulgan
Geographic location 102.9215, 48.7905
Geologic map unit 102.9215, 48.7905
Nearby data

Geologic information

Deposit type Porphyry copper
Age determination method Geologic inference
Age range ~290 Ma (Variscan orogeny)
Age reference geologic inference
Minerals kaolinite, sericite
Associated rocks syenite porphyry, quartz porphyry stocks and granite and felsite dikes
Tectonic setting continental margin
Stratigraphic age Early Permian

Commodity and development information

Development status Occurrence
Major commodities Cu
Gold-Moly ratio -9999

Reference information

Comments Grade of ore minerals varies from 0.001–0.01% Cu, rare 0.1% Cu. Consists of weak Cu minerals in altered Late Permian rhyolite and dacite porphyry, their tuffs, tuff breccia and ignimbrite of the Khustai unit, intruded by syenite porphyry, quartz porphyry stocks and granite and felsite dikes. Zones of intensive breccia, epidote alteration, silica alteration, limonitization and weak Cu minerals. Cu minerals occur in sublongitudinal zone with a length of 5.0–6.0 km and width of approximately 2.0 km. Three quartz-rich bodies, up to 10 m by 50 m, have weak chalcopyrite disseminations and malachite and azurite coatings. Host volcanic rock is altered to sericite, kaolinite and local intense silica.
Study area name Central Asian Orogenic Belt
References Dejidmaa and others (2002); Nokleberg and others (1999); Nokleberg and others (2003); Nokleberg and others (2006); B. Gurlkhaajav and others (written commun., 1974); Warren J. Nokleberg (written commun., 2006)
Site reference Mihalasky, Ludington, Hammarstrom, and others (2015)