Arias, Fábrega & Fábrega acted as counsel to Rio Tinto Brasil Ltda. in connection with the sale of its undeveloped potash assets, largely comprising the Potasio Rio Colorado (PRC) potash project in Argentina, and its Corumbá iron ore mine in Brazil and the associated river logistics operations in Paraguay to Companhia Vale do Rio Doce (Vale), the Brazilian mining company, for a total cash consideration of US$1.6 billion.