Rio Tinto and the Aluminum Corporation of China (Chalco) have signed a definitive agreement to jointly acquire a controlling stake in Companhia Brasileira de Alumínio (CBA) from Votorantim. The acquisition, structured through a joint venture (JV), with Rio Tinto holding 33% and Chalco 67%, values Votorantim’s 68.596% stake in CBA at approximately $902.6m. The transaction will involve a cash payment of 10.50 reais ($0.66) per share, reflecting a 21.2% premium over the prior 20-day average trading price o ...