Gwalia pursues Portman for royalty; NAB won't rule out rival bid; Resources boom for 20 years; BHP market value surges past $250bn on Chinese whispers; Chemicals tycoon snaps up Repcol stake

Gwalia pursues Portman for royalty; NAB won't rule out rival bid; Resources boom for 20 years; BHP market value surges past $250bn on Chinese whispers; Chemicals tycoon snaps up Repcol stake