By Rhiannon Hoyle 
 

MELBOURNE, Australia--Rio Tinto PLC's (RIO) top ranks warned of continued volatility in world markets, although some bright spots are emerging, and reiterated the company would look at new major investments when industry conditions improved.

Since the early years of the global financial crisis, resources companies have experienced market volatility greater than in living memory, said Jan du Plessis, chairman of Rio Tinto, one of the world's largest mining companies.

"Financial markets continued to be volatile in 2013 and while the outlook is now brighter in some parts of the world, we believe that volatility looks set to remain in the short- to medium-term as a number of structural deficiencies remain unresolved," he told shareholders at the miner's Australian annual general meeting in Melbourne Thursday.

He cited tensions in Europe, where he said considerable challenges remain due to the combination of low interest rates, low growth and low inflation. The tapering of the U.S. Federal Reserve's quantitative easing program, which has supported commodity prices in recent years, is also "uncharted territory," he said.

Nevertheless, he signaled confidence in China as Beijing works to move toward a period of more sustainable economic growth, even if it does create "some variability in the near term," Mr. du Plessis said.

"There is no question, however that the Chinese leadership remains committed to pursuing economic reform which offers potential benefits for the global economy in the long term, even if there is some variability along the way," he said.

Also speaking at the meeting, Chief Executive Sam Walsh said Rio Tinto would review new major projects, like its Resolution copper development in Arizona and the South of the Embley bauxite project in Australia's Queensland state, "when the time is right."

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

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