The Mantos Blancos mine is located in the north of Chile, in the Antofagasta Province, in the Antofagasta Region. The mine is 45km north-east of the city of Antofagasta.
Due to a depletion of oxide ore reserves and in order to maintain copper production Mantos Blancos is expanding the sulphide ore treatment capacity from 4.2Mt per year to 7.3Mt per year. The two metallurgical processes in operation at Mantos Blancos are:
- Flotation plant (concentrator) for sulphide ore with insoluble copper grade (‘ICu’) greater than 0.22%
- Dump leach process for oxides with soluble copper grade (‘SCu’) greater than 0.10%
The open-pit operation includes one large open pit (Santa Barbara) that provides most of the sulphide material for the concentrator and oxide material for dump leaching.
Other sources of material are:
- Flotation: Sulphide stockpile (Cancha 90)
- Dump leach: Oxide stockpile (Mercedes stockpile)