Rainfall was measured between 200mm and 400mm over Bowen Basin, which hosts large open pit mines of several companies including Anglo American, the BHP Billiton Mitsubishi Alliance (BMA), Peabody Energy, Rio Tinto and others.

Floods caused by ex-tropical cyclone Oswald also led to water flowing into the open coal pit of Middlemount mine, owned by Peabody Energy and Yancoal Australia.

The largest coal producer in the region BHP Billiton will lose production from several coking coalmines in the Bowen Basin due to the exstensive damage to roads and other infrastructure.

BHP said it was currently reviewing the impact of the heavy rains on its mines.

Transport group Aurizon Holdings, meanwhile, shut down two railway lines that feed the Gladstone coal port for 10 days, leaving uncertainty over the transportation of coal.

An Anglo American spokeswoman said that improving weather conditions will enable the miners to resume work in some areas.

According to Reserve Bank of Australia estimates, coal production was hit by 25 million tonnes in late 2010 and early 2011 due to similar wet conditions.