BHP Billiton Ltd. is forecast to post a $5.9 billion net loss for the year ended June 30, the first since a 2001 merger that created the world’s biggest miner, according to the average of 11 analysts’ estimates compiled by Bloomberg. Raw materials prices tumbled to a 25-year low in January, while BHP booked pretax impairments in February of $8.4 billion against U.S. shale assets and a Brazil iron ore joint venture. BHP reports results Tuesday.

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