The update follows new analysis of 14 exploration holes on the eastern edge of Guildford’s 16,500sq.km of licence holdings at the northern end of the basin.
The company said a further substantial increase was possible as drilling continued at White Mountain.
After further analysis and washability testing, thermal coal at White Mountain is expected to be confirmed as export quality with moderate ash and moderate calorific value.
Guildford said the seams intersected had an average grid net seam thickness of 10.5m across four groups and were amenable to open cut and underground mining.
As the project comes more into focus, Guildford has begun studies in support of the initial advice and environmental impact statements in preparation for a mining licence application.
This advancement also coincides with the appointment of Guildford to the North Queensland Supply Chain Steering Committee, established through $1.7 million in government funding to prioritise infrastructure projects and investment in the northwest of the state.
Guildford’s Northern Galilee coal projects include the White Mountain, Hughenden, and Pentland deposits.
Hughenden holds an inferred JORC resource of 1.6 billion of thermal coal, while less developed Pentland tenement targets 295Mt to 2.9Bt of coal with thermal potential.