BELL RESOURCES BOOSTS STAKE IN BHP <Bell Resources Ltd> said it has executed an underwriting agreement with <Equiticorp Tasman Ltd> to acquire 57.6 mln ordinary shares in The Broken Hill Pty Co Ltd <BRKN.S> for 540 mln dlrs. Bell said in a statement that it now holds 29.93 pct of BHP's 1.2 billion shares.