Un-mined resources of prime coking coal are primarily in the Bulli and Balgownie Coal Seams under the CamdenCampbelltown-Picton region; however, this is a rapidly growing metropolitan area of Sydney, and subject to strategic land release and other Government policies which limit opportunities for coal resource development.

The Bulli Coal Seam is generally considered to contain prime quality coking coal with medium to high ash and low to medium volatiles, with an average raw coal production rate of 76%. The Project would target the Bulli Coal Seam, which reaches depths of up to 800 m in the central north of the Southern Coalfield and exceeds 850 m in the north-west. The Bulli Coal Seam is 5 m at its thickest in the north of the Coalfield, and in other regions varies in thickness between 2 and 3 m.