Rio Tinto's Paraguay investment to reach $3.5 bln

Nov 29 （Reuters） - Rio Tinto Alcan, a unit of global mining giant Rio Tinto （RIO.L）, said Monday it will raise its investment to build an aluminum plant in Paraguay to $3.5 billion from $2.5 billion previously.

Rio Tinto, which announced the initial investment in December 2009, said the project will produce an estimated 670,000 tonnes of aluminum a year, according to project manager Juan Pazos Romero. （Reporting by Mariel Cristaldo and Daniela Desantis; Writing by Luis Andres Henao; Editing by John Picinich）