Castellanos will produce 220,000t/y lead and zinc concentrates for export, local press report.
Transport minister Guillermo Dietrich said that increased transparency and competition between bidders allowed the government to obtain lower prices for projects.
Better transparency is needed in the decision-making processes of regulatory agencies, according to a local attorney and former government official.
Mato Grosso state water utility Sanesul is working on closing a concession contract with the city of Dourados.
Only one bid was presented for the initiative, and it was US$24mn higher than the official estimate. Public works minister Ramón Jiménez said that the offer is still under evaluation.
As part of the deal between the ministry and Metro de Santiago, the subway operator will also have a key role in the development of Américo Vespucio Oriente.