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Location: 35 km NE from Lancelin, Western Australia, Australia
Level 17, 240 St Georges TerraceGPO Box U1988PerthWestern Australia, Australia6000
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The Premises is located within the central part of the northern Perth Basin, a deep linear trough of sedimentary rocks that is bounded to the east by the Darling Fault and composed of up to 12 km of Permian to Quaternary sediments. The regional stratigraphy indicates three distinct depositional cycles in the sedimentary succession, with each cycle separated by a major unconformity in the form of an erosional surface.The mineralised ore that comprises the Cataby deposit is hosted in the Late Tertiary Yoganup Formation. In the southern portion of the Premises, south of Mimegarra Rd, the mineralised deposits are underlain by the Leederville Formation, whilst in the north are underlain by Yarragadee sediments. A small portion of the south-eastern section of the deposit is likely to be underlain by the Mesozoic sediments of the Parmelia Formation.Basement materialsThe Leederville, Parmelia and Yarragadee Formations consist of interbedded, weakly to well consolidated sandstone, siltstone, shale and claystone that, in the upper portions, have been deposited in a non-marine, primarily fluvial setting. The Leederville Formation sediments conformably overlie the Yarragadee and the Parmerlia Formations, and as such are considered to be in hydraulic continuity.On the eastern margin of the deposit, the basement materials outcrop along the Gingin and Dandaragan Scarps. Yoganup FormationThe mineralised sands of the Yoganup Formation unconformably overlie the Cretaceous Formations, resulting in an abrupt contact. The Yoganup Formation consists primarily of friable ‘beach’ sands which were deposited and developed during successive marine transgression and regression events. Given its predominantly sandy texture, it hosts the regional aquifer in a semiconfined system.Guildford FormationFollowing the last regression of sea levels in the Pliocene (Late Tertiary), alluvial, fluvial and colluvial conditions were favoured resulting in the deposition of the Guildford Formation. These conditions continued throughout the Pleistocene resulting in the development of thick (up to 30m) beds of primarily sandy clay to clay sediments directly overlying the sandy Yoganup Formation. Isolated zones of sand exist within the clayey Guildford sediments, in response to heterogeneous parent materials. These sandy zones are currently saturated resulting in isolated regions of groundwater within the predominately unsaturated clays.Bassendean Sands Unconformably overlying the Guildford Formation are a series of aeolian sand dunes corresponding to the Bassendean Dunal System. These dunes represent an eastern extension of the more widespread dunal system on the Swan Coastal Plain and often attain thicknesses of up to 10 m, playing an important role in controlling surface water movement throughout the region.
