-- Xstrata Copper assesses investor interest in its Frieda River project

-- Commits to delivering a feasibility study to its partner this year

-- Continues to evaluate its portfolio of development projects

MELBOURNE--Xstrata PLC (XTA.LN) is considering selling its majority interest in the Frieda River copper development in Papua New Guinea as part of a review of projects worldwide, a spokeswoman for the mining company's copper division said Thursday.

Xstrata has committed to the work scheduled at Frieda River this year and to delivering a feasibility study by December to its joint venture partner, Highlands Pacific Ltd. (HIG.AU), the spokeswoman said in an emailed reply to questions.

"We are continually evaluating our industry-leading portfolio of development projects and assessing the best way to advance these projects, maximize their value to Xstrata and ensure the best outcome for all stakeholders," she said. "As part of this process, we are assessing the interest of other investors in the Frieda River project."

Xstrata is the manager and almost 82% owner of the project, with Highlands holding the remainder. A prefeasibility study in 2010 indicated the project could support a mine producing 246,000 metric tons of copper and 379,000 ounces of gold a year for the first eight years of a multi-decade life.

Highlands in a statement said it had recently been advised that Xstrata Copper had begun a market evaluation of a number of projects in its portfolio, including Frieda River.

The Australian exploration company has estimated the project has a resource of about 12 million tons of copper and 18.5 million ounces of gold, which ranks as one of the world's largest undeveloped deposits of the two metals. It has said that Xstrata has spent more than US$250 million in the last five years on drilling and engineering studies.

Xstrata Copper is in the midst of expanding its operations, with projects under construction to boost production by more than 60% to 1.5 million tons a year over the next three years, the spokeswoman said. Its Antapaccay project in Peru is on track to start production in the second half of this year, and development of its US$4.2 billion Las Bambas project in southern Peru is underway.

The company at the end of last year moved to underground mining at its Ernest Henry copper mine in Australia's Queensland state.

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

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