Mining giants BHP Biiiiton Ltd and Rio Tinto Ltd posted better than expected figures for 2013 as a host of rival majors felt the full force of a falling gold market. BHP Billiton's half-year attributable profit increased by 31% to $US7.8 billion as the company hinted at a possible share buyback in August. Underlying earnings before interest and tax also experienced an uplift of 15% year-on-year to $US12.4 billion over the same period.
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