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Location: 4 km S from Werris Creek, New South Wales, Australia
1435 Werris Creek RoadPO Box 125Werris CreekNew South Wales, Australia2341
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The geology at WCC (Werris Creek Coal) Mine as located within the Werrie Basin is containing Permian sedimentary and volcanic rocks that unconformably overlie the Middle Cambrian to earliest Permian basement of the Tamworth Belt, Southern New England Orogen. The geology at WCC is an outlier of the Early Permian Willow Tree Formation, which is now recognised as equivalent to the Greta Coal Measures, which unconformably overlies the Werrie Basalt.Two lithostratigraphic units occur within the equivalent Greta Coal Measures (Skeletar Formation and Rowan Formation) and one lithostratigraphic unit from the Maitland Group (Railway View Conglomerate) are recognised in the Werris Creek outlier. The equivalent Greta Coal Measures contains at least nine coal seams, with the formal names of coal members chosen to correspond with the earlier alphabetical seam identification. The coal seams range in depth from as little as 10m at subcrop to an estimated 180m in the centre of the basin. Weathering depths range from 10 – 50m. Individual seam thicknesses are up to 8m but are more commonly in the range 3 - 4m. Underlying the coal measures is the Werrie Basalt, a sequence of deeply weathered basaltic lavas, volcanoclastics and palaeosols.The Werris Creek coal deposit is contained within a closed syncline whose longitudinal axis is oriented NNW-SSE. Dips near subcrop are up to 60o , but flatten towards the centre of the basin. The irregular upper surface of the Werrie Basalt may have affected deposition of the overlying coal measures. A basement high is thought to be responsible for the thinning of G Coal in places, and up to 40m relief is inferred. A number of small faults with displacements of up to 2m were recorded in the old underground workings. A complex NNW- trending graben structure traverses the open cut mine, with displacements of up to 5m. Faults are also inferred from boreholes. Dykes were also recorded in the old mine, in the open cut and in boreholes.The coals at Werris Creek are bituminous, high volatility (VM+/-35% daf), low sulphur (<0.35%) and vitrinite-poor. The coals are non-swelling to very weakly caking. Ash content is generally low to medium.
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