The Ironbark No. 1 Coal Mine is located in the northern Bowen Basin coalfields in Central Queensland.
The geology of the mine site comprises the Permian Rangal Coal Measures and overlying Triassic Rewan Group sediments. These sediments outcrop at the surface or are overlain by Tertiary sediments. Localised deposits of unconsolidated alluvium occur within the creek beds that traverse the mine site.
At a regional scale, the target Rangal Coal Measures sub-crop to the north-west of the Ironbark No. 1 Coal Mine. The Rewan Formation covers the property with the overlying Clematis Group outcropping in the Carborough Range to the east. The underlying Fort Cooper Coal Measures and the upper Yarrabee Tuff marker band occur below the Rangal Coal Measures at mineable depths.
Rangal Coal Seam Geology.
The Leichhardt and Vermont Seams of the Rangal Coal Measures form the principal economic coal resources in the Ironbark No. 1 Coal Mine. A high gamma marker occurs immediately below the floor of the Vermont Upper Seam and it is interpreted to be the Yarrabee Tuff. The Yarrabee Tuff averages 0.5m thick. This tuff marks the interpreted top of the Fort Cooper Coal Measures.
Leichhardt Seam.
The Leichhardt Seam is typically 4.5 - 5.0m thick, thinning towards the southern boundary of the deposit.
The Leichhardt Seam has typically been divided into four plies, Q1 to Q4, however up to seven plies have been logged in some holes. The u ........