PERTH, Australia--Rio Tinto PLC will "tightly manage" its operations and fiscal position as it grapples with a sharp downturn in prices for key commodities such as iron ore and coal, but has the flexibility to weather tough markets, the miner's chairman said Thursday.

Jan du Plessis said he expects Rio Tinto will face continuing challenges in commodity markets in the short term, citing economic and geopolitical uncertainty. He said divergent monetary policy paths in Europe, the U.S. and parts of Asia was adding to an uncertain outlook.

"We will continue to tightly manage the business and our balance sheet in the face of the lower commodity prices we've seen so far in 2015," he told the company's Australian annual general meeting in Perth.

"We have the capacity to weather difficult market conditions, fund future growth and appropriately reward shareholders," he said. Iron-ore prices have halved in the past year as supplies of the raw material outpaced demand.

Mr. du Plessis said investor returns would remain the core focus of Rio Tinto, which earlier in the year announced a US$2 billion share repurchase.

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

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