Xstrata said it is still reviewing the aluminium business it inherited with the purchase of Falconbridge last year.
The business comprises a 50% holding in the St Ann bauxite mine in Jamaica and the Gramercy alumina refinery in the US as well as the New Madrid smelter in Missouri and the Norandal rolled products operations.
Company chief executive Mick Davis commented: "As signalled at the time of the acquisition, we are conducting a strategic review of this business, to assess its potential as a platform for future growth in this new commodity, compared to the prospects for a profitable sale, and I expect a final decision to be made during the first half of this year."