Analysts said the production levels met market expectations and BHP was expected to post a half-year net profit of more than £3.6bn ($7bn).

Takeover authorities have given BHP until 6 February to make a bid for Rio.

Both Anglo-Australian companies, Rio also recently reported record production figures as the global commodities market continues to boom, despite fears of a recession in the US and the resulting worldwide stock market turbulence.

The UK Takeover Panel has given BHP until 6 February to make its bid for Rio, expected to be worth about $140bn, or else walk away from the deal.

Rio continues to maintain that BHP’s proposed offer fundamentally undervalues the company.