Rio Tinto Australian rival BHP Billiton (NYSE:BHP) ended its long pursuit of mining and metals player Rio Tinto last month, as anticipation of European Union demands to divest assets from the potentially combined company made the marriage much less attractive. The broken deal sent Rio Tinto's shares into a tailspin, and the company has unveiled a restructuring plan to deal with sinking commodities prices and the $40 billion in debt it tacked on to acquire Canadian aluminum producer Alcan.