The initial resource amount was estimated at 14Mt in September 2005.
Further CSR coking tests on core samples have confirmed the hard coking properties of the Ashford Seam.
Drilling is also expected to commence soon at Ashford North and Atholwood exploration areas.
The Ashford exploration program will now move north of the Ashford Project Area to test for strike extensions of the coal measures identified to date, the report said.
It is intended that exploration will progress north, moving away from the delineated resource at Ashford, and build on the accumulating regional knowledge.