m2 central solar heating plant supplies 80% of the 80 GWh annual heat for an electrowinning copper extraction process, despite dust problems. The Toki Cluster is a group of porphryies that is now included in the Codelco Norte division. In 2004 the resources in the four porphyries found to date was estimated at 18 million tonnes of copper. Since then a fifth, "Miranda", has been found containing estimated resources of 2.5 million tonnes of copper. Ventanas Ventanas is a smelter situated on the coast 35 km north of Valparaiso. It was transferred from ENAMI in May 2005. It processes concentrates and anodes from Andina and El Teniente, amongst other producers, and makes Codelco increasingly self-sufficient. The 'New Ventanas Project' is investigating the feasibility of converting it into a large scale smelting and refining complex. The plant consists of a Teniente converter with electric furnace slag cleaning, three Pierce Smith converters, a rotary anode furnace and two reverbatory refining furnaces and two anode casting wheels. Capacity is 450,000 tonnes p.a. concentrate to produce 110,000 tonnes copper annually. Off gasses go to a Hugo Petersen sulphuric acid plant. The refinery produces cathode copper, and gold, silver and selenium are produced from the anode slime left over from the refining process. Codelco's presence out of Chile On July 26, 2012, the Chilean and Ecuadorian government signed an agreement to activate the highly controversial Junin copper mining project, in the Intag area of Northwestern Ecuador. The agreement calls for Codelco, jointly with the Ecuadorian national mining company- ENAMI- to begin exploration activities in the biodiverse Cordillera de Toisan after the second quarter of 2013. The project would be one of the first experience for the Chilean-owned company outside the Chilean deserts where it has most of its mines. It is controversial because Intag is the same area where communities have forced two transnational mining companies to abandon exploration activities due to widespread rejection of mining activities (Mitsubishi subsidiary in 1997 and Canadian Copper Mesa in 2009). See also Chilean nationalization of copper References External links Copper mining companies of Chile Companies based in Santiago Non-renewable resource companies established in 1976 Chilean companies established in 1976