BHP Billiton Ltd. and Mitsubishi Corp. said they expect their newest coal-mining operation in eastern Australia to be able to ride out a prolonged market slump, even as new Chinese import tariffs raise concerns over the outlook for the country's coal sector.

On Monday, the companies, which together operate a 50-50 joint venture known as BHP Billiton Mitsubishi Alliance, officially opened the US$3.4 billion Caval Ridge coking-coal mine in Queensland state. The operation, designed to produce 5.5 million metric tons a year, first started producing coal earlier this year.

"We are confident that if we maintain our productivity focus then we will continue to have a globally competitive business," BHP coal president Dean Dalla Valle said. Coking coal is a key ingredient in steel, used widely in the construction and manufacturing sectors.

China last week said it would impose tariffs not seen in a decade on imports of certain types of coal, raising concerns among analysts about the outlook for Australian coal. The move comes as the pace of China's coal demand is slowing.

"The exact impact of an import tariff on domestic and seaborne volumes is subject to a range of coal price and demand elasticities," Commonwealth Bank of Australia analyst Lachlan Shaw said. "However, what is certain is that a coal import tax would be negative for China's coal import demand and, by virtue of likely resultant slower seaborne demand, seaborne coal pricing."

The price of Australia's premium coking coal has fallen more than 15% this year, to around US$112 a ton, according to data provider the Steel Index.

That has already sparked widespread cost-cutting and workforce cuts, including in BMA's business. Only last month, the companies announced they would have to shed 700 jobs across their operations as they redoubled their efforts to reduce spending.

As recently as 2011, coking-coal prices traded above US$300 a ton, but have been ravaged by oversupply.

Despite recent job cuts, BHP and Mitsubishi Monday argued their operations are highly efficient and would be able to withstand pressure from a weak global market. BMA runs eight coal-mining operations in eastern Australia, making it the world's biggest exporter of coking coal.

"As the low prices have driven high-cost mines out of business, there should be more demand for coking coal from efficient mines," said an official of Mitsubishi. Mitsubishi wants to double its coking coal sales to 40 million tons a year by 2020 from 20 million tons in 2012.

"Global coking coal demand is rising, mainly due to India and China. It's true that prices are not high right now, but we will keep going by [running] efficient operations," the Mitsubishi official said.

Write to Mari Iwata at mari.iwata@wsj.com and Rhiannon Hoyle at rhiannon.hoyle@wsj.com

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