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A number of central Queensland coal mines operated by BHP Billiton and Glencore remain shut due to torrential rain as ex-Tropical Cyclone Debbie continued to make its way through the state.
Production at Glencore's Collinsville and Newlands coal mines remained suspended, but the company said both are expected to reopen within the next 48 hours.
Glencore said its mines have not suffered any significant damage.
"All our people are safe and there has been no damage to our mine infrastructure," corporate affairs manager Francis De Rosa wrote in an email to ABC News.
"We are undertaking water management activities in accordance with our approvals."
BHP Billiton, meanwhile, said its mining remains temporarily suspended at central operations and that the impact on production would be reported in its next quarterly update.
"We continue to follow wet weather management plans at our mining operations and Hay Point Coal Terminal," the company said in an emailed statement.
"Plans are well advanced on when we can safely resume operations."
Analysts said the impact of Cyclone Debbie on production is unlikely to be as great as Cyclone Yasi, which devastated parts of North Queensland in 2011 and wiped out around 20 million tonnes of coking coal production.
Anglo American operates two open cut mines located in the Bowen Basin. The ABC has contacted the company for comment.
The Bowen Basin is one of Australia's richest coal reserves, with the region accounting for around half of the world's seaborne coking coal supplies, meaning any lengthy disruption to production could send prices surging.
The tropical low that was left over from Cyclone Debbie tracked right across the Bowen Basin, passing over mining towns such as Moranbah and Clermont, before heading south today to drench south-east Queensland.
Aurizon, which operates coal trains in Queensland, said all four of its coal rail systems - Newlands, Goonyella, Blackwater and Moura - remain closed.
"Weather pending, Aurizon expects to commence aerial inspections of the Goonyella and Newlands corridor today," an Aurizon spokesperson said in an email to the ABC.
Glencore said it was in close contact with Aurizon on any developments.
"This will provide an initial assessment of any damage or flooding on the rail corridor and allow Aurizon to plan any recovery work that is required," the company explained.
Aurizon's road and rail freight operations from Brisbane to Bowen are also suspended, the company's spokesperson said.
Topics: coal, mining-industry, company-news, cyclones, floods, business-economics-and-finance, australia