By Robb M. Stewart 
 

MELBOURNE, Australia--Rio Tinto PLC (RIO), one the largest private employers in Australia's far north, will halt production of alumina at an unprofitable refinery that has struggled with low prices and a high exchange rate.

The Anglo-Australian mining company said Friday it expects to begin the process of suspending refining operations at Gove near the town of Nhulunbuy in the first quarter of 2014 and focus in future on mining bauxite at the site, which employs 350 staff and contractors.

"Our aluminum business is facing challenging market conditions and tough decisions are needed, but those decisions are so much harder when our employees and local communities are affected as they are in Nhulunbuy," Sam Walsh, chief executive of the London-based company, said in a statement released to the Australian Securities Exchange.

Rio Tinto's Gove refinery and bauxite mine in the remote Northern Territory together employ roughly 1,400 people, including contract workers. The mining town of Nhulunbuy, which lies on the edge of the Arafura Sea, has about 3,800 permanent residents.

The refinery has suffered heavy losses for some time and Rio Tinto had previously threatened to close the operations, but agreed in February to keep it open after securing a 10-year supply of natural gas that will substitute for costly fuel oil. That supply deal fell through in July with a change in government in the Northern Territory. Rio Tinto early this week confirmed it had scrapped plans to convert the refinery to run on gas.

Mr. Walsh said the company had worked with federal and territory governments over recent months to secure a future for the refinery and a number of scenarios were considered, but it wasn't possible to find a sustainable solution. He said the Northern Territory government had done all it could to help secure a future for the operation.

The company said it would consult with workers and the local community over the coming weeks to develop plans for the timing of the closure of the refinery, and at this stage there would be no immediate change in operations.

Bauxite is the mineral form of aluminum. Alumina is the given name for aluminum oxide, which is extracted from bauxite.

Write to Robb M. Stewart at robb.stewart@wsj.com

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