SYDNEY-- BHP Billiton Ltd. said it favors spinning off more unwanted assets, in a move to narrow its focus to commodities such as iron ore and petroleum which account for the bulk of its earnings.

BHP Billiton, the world's largest mining company by market value, didn't specify which assets it might sell to concentrate on producing iron ore, copper, coal and petroleum.

Other assets include nickel, manganese and aluminum operations, which analysts believe will form the rump of a separately listed company.

BHP Billiton first signaled it may sell some assets in April as part of a restructuring, but didn't say how this would be achieved.

"A demerger of a selection of assets is our preferred option," BHP Billiton said in a filing to the Australian Securities Exchange on Friday.

BHP Billiton has already sold billions of dollars of operations in the past couple of years as management looked to cut debt and boost shareholder returns. It sold its Yeelirrie uranium deposit in Western Australia to Cameco Corp. for US$430 million and its diamonds business to Dominion Diamond Corp. for US$553 million.

"The board has continued to study various structural alternatives including at its meeting this week," the company said. "The board expects to consider this, and other matters, when it reconvenes next week."

BHP Billiton is due to report full-year results Tuesday.

Write to Rhiannon Hoyle at rhiannon.hoyle@wsj.com

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