Xstrata's Beltana produced 7.2Mt for the 2007 financial year, a slight increase on 2006 figures.
More than 2Mt behind was another of Xstrata's rising stars, Oaky North, which produced 5Mt for the year.
A number of Australian longwall mines, including Kestrel and Newlands Northern are hoping to rival Beltana within the next four years, predicting production rates of 7Mtpa.
Anglo Coal's Moranbah North won third spot at 4.8Mt, a significant improvement on 3.5Mt the previous year and is now forecasting further production increases following the installation of a new Joy longwall system in 2009.
Newlands Northern proved itself to be another strong competitor for Xstrata, producing 4.4Mt for the year, and forecasting production of 7Mt for 2007.
In fifth place, Rio Tinto's Kestrel dug out 3.9Mt for the year, a slight decrease on previous years, but is now investigating the potential of widening the longwall face and ramping up to 7Mtpa by 2011.
Oaky Creek No. 1 managed to scrape in at sixth on the ladder with 3.9Mt, a big fall for the Xstrata-owned mine, which took out second spot in 2006 after producing 5Mt.
New mines on the list in 2007 include Felix Resources' Ashton mine - which ramped up in March and produced 677,500t - and Resource Pacific's Newpac No. 1 mine which ramped up in January and produced 1.1Mt.
Australia's longwall mines produced 83.75Mt ROM coal during the 2007 financial year, more than 2006 when the mines produced 80.58Mt, according to Coal Services' annual statistical review.