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Location: 14 km NE from Biloela, Queensland, Australia
1091 Biloela Callide RdPO Box 144BiloelaQueensland, Australia4715
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The Callide Mine is located in the Callide Basin of Central Queensland, approximately 20km north of Biloela and 85km south-west of Gladstone.Callide operations are separated into four precincts:1. Boundary Hill (which includes Boundary Hill South and Campbell Creek);2. The Hut;3. Trap Gully; 4. Dunn Creek (which includes The Bluff).The Boundary Hill South is located within the Callide Basin, which is a fault bounded synclinal basin of Middle to Upper Triassic age. The Callide Basin is approximately 22km long and 8km wide, and is aligned generally along a north-west to south-east axis. The geology of the Boundary Hill South area includes the following strata: • Quaternary alluvium associated with creeks;• Biloela Formation; • Precipice Sandstone; • Callide Coal Measures; • Triassic Muncon basement volcanics. The Callide Coal Measures are the primary resource of economic significance at the Boundary Hill operation.The Callide Coal Measures are the oldest formation in the Callide Basin. The Callide Coal Measures comprise a siltstone dominated matrix containing upper and lower coal seams. The upper Callide Coal Measures are sporadically overlain by a coarse grained sandstone unit that is comparable to the overlying Precipice Sandstone. The coal measures are laterally continuous across the Callide Basin and outcrop to form the ridgeline at the eastern extent of the basin. This unit dips from the ridgeline to the south-west across the basin. The thickness of the Callide Coal Measures varies across the basin and reaches 150m thick in the centre of the basin and 30m to 40m thick in the project area. The depth to groundwater in this unit is around 50m below ground level at the eastern boundary of the project area and reduces to around 5m at the western project boundary.
