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Location: 23 km SW from Middlemount, Queensland, Australia
201 Charlotte StreetGPO Box 1410BrisbaneQueensland, Australia4001
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Mining scale, mining and mill throughput capaciites.Full profiles of select mines and projects.
Shaft depth, mining scale, backfill type and mill throughput data.Full profiles of select mines and projects.
Equipment type, model, size and quantity.Full profiles of select mines and projects.
Camp size, mine location and contacts.Full profiles of select mines and projects.
The Grasstree is located on the north-western flank of the Bowen Basin, a sedimentary basin comprising Permian to Triassic age geology. A veneer of more recent Tertiary and Quaternary age sediments typically overlie the Bowen Basin strata. The relevant geology in the vicinity of the Grasstree longwall mining area includes: - Quaternary alluvium associated with German Creek and Little Parrot Creek;- A veneer of Tertiary sediments of the Duaringa Formation;- Permian coal measures including the target German Creek Seam (GC seam).The Permian coal measures include the Rangal Coal Measures, the Burngrove Formation, the Fort Cooper Coal Measures (also known as the Fairhill Formation), the Macmillan Formation and the German Creek Formation. The coal measures comprise a sedimentary sequence with interbedded coal seams, including the target GC seam. The upper profile of the coal measures has been extensively and deeply weathered. The weathered coal measures outcrop at the surface across the southern portion of the longwall mining area and much of the surrounding area, forming undulating sandy plains. In the northern portion of the longwall mining area, the coal measures sub-crop under the Tertiary sediments and dip to the east. As the coal measures dip to the east, the depth of the GC seam increases from approximately 330 m in the south-western part of the Grasstree longwall mining area to a maximum depth of approximately 540 m at the north-eastern extent of the longwall mining of area.
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