Mining giant Rio Tinto has sold part of its Alcan packaging unit to US packaging producer Bemis for $1.2 billion. UK-based Rio, the worldÔÇÖs third-largest mining company, sold the Food Americas division of its packaging arm for $1 billion in cash, plus an extra $200 million for stock. The sale is the latest in a series for Rio, which has been offloading assets and stock since its debt soared to $38.7 billion when it purchased Canadian aluminum group Alcan in 2007. The move comes after the firm raised $15.2 billion in a recent rights issue.