By Rob Taylor 

CANBERRA, Australia-Prime Minister Tony Abbott backed a special parliamentary inquiry into the iron-ore market, saying it was important to discover the facts underpinning sharp falls in prices for the country's chief export.

Mr. Abbott didn't say whether an inquiry should take the form proposed by Nick Xenophon. The independent senator has called for the economics committee to investigate claims that mining giants BHP Billiton and Rio Tinto are driving down prices by boosting supply to undermine smaller competitors.

"What we don't want to see is predator behavior by any companies," Mr. Abbott said in a radio interview Friday. "I'm not in the business of demonizing any company because I'm very conscious of the fact that Rio and BHP are Australia's biggest corporate taxpayers. I want them to continue making a lot of profits here in Australia."

On Thursday, Mr. Xenophon postponed a parliamentary vote on an inquiry, saying the companies had launched a "furious" campaign to thwart an investigation. Both BHP and Rio declined to comment on the matter.

The Minerals Council of Australia, a lobby group for the mining industry, said it welcomed a parliamentary inquiry to help expose the idea that higher Australian production was chiefly responsible for the dramatic price falls on the global market. Prices were moving in line with market principles, the council said, adding that government intervention was unwarranted.

Some smaller Australian producers have been among the most vocal critics of their larger rivals' strategies. Companies like Fortescue Metals, controlled by billionaire Andrew Forest, are more vulnerable to lower prices because they lack the scale to keep down production costs.

Iron-ore prices have dropped to their lowest in a decade this year as economic growth in China, a major consumer of the commodity, has slowed and producers have ramped up supply following years of investment in new mines. The price falls have become so pronounced that they are eating into tax revenue, making it harder for Mr. Abbott's government to improve the nation's finances as promised at the last election.

"We do need to know the facts of what's going on here, because I'm conscious of the claims being made by Andrew Forrest and others," said Mr. Abbott, whose remarks suggest an inquiry will likely go ahead. "We don't want to see irrational behavior by any businesses, particularly when predator behavior, irrational behavior, may well have a dramatic impact on the economy."

Write to Rob Taylor at rob.taylor@wsj.com

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