The collapse of Lehman Brothers has put the spotlight on BHP Billiton's takeover of Rio Tinto, with Chinalco in urgent talks with Lehman Brothers' liquidators to retrieve a 12 per cent stake it holds in Rio.

The collapse of Lehman Brothers has put the spotlight on BHP Billiton's takeover of Rio Tinto, with Chinalco in urgent talks with Lehman Brothers' liquidators to retrieve a 12 per cent stake it holds in Rio.