Located in La Araucania region
Approximately 99,000 hectares
Area mainly Andean ranges
Elevation between 690 - 2,700 meters
The activity of the volcanoes Copahue and Callaqui, associated with zones of structural weakness (Liquiñe-Ofqui fault) related to the inversion of the Cenozoic Basins, would be responsible for the existence of a distinct liquid-dominated geothermal system with respect to the location of the heat source.
Thermal demonstrations in the northern sector located on side of the Río Queuco correspond to waters close to the area of "outflow", while evidences in the near Nitrao hot spring would correspond to a peripheral water not associated with the geothermal system controlled by these volcanoes.
In the southern sector of Callaqui volcano, the source of "El Avellano" corresponds to a type of sodium chloride water that could be indicating a deep balance and be part of the "outflow" (near the "upflow"), meanwhile thermal Copahue manifestations which do not reflect a state of equilibrium, would correspond to the area of steam-heated waters located on the top of the heat source.
NE-SW and NW-SE geological structures which are associated the Copahue and Callaqui volcanic complex, reactivated by recent tectonic phenomena, have produced an increase of magmatic activity being the most probable caloric source, with the consequent production of "outflow" areas and migration of hot water through faults and fractures to the areas covered by the concession Callaqui.