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Location: 60 km E from Dongara, Western Australia, Australia
Level 2, 1 Walker Avenue West PerthPerthWestern Australia, Australia6005
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Yandanooka is situated within two sub-basins of the Perth Basin. The eastern hinterland was formed by the Urella Fault displacing the Archaean Mullingarra Gneiss within the Irwin sub-basin. To the west of the Urella Fault the Dandaragan trough formed, which hosts the majority of the tenure.Heavy Mineral sands are the product of Cainozoic coastal placer deposits formed as a result of a marine transgression. Eustatic change in sea level has resulted in the prospective stratigraphy being situated between 280 mRL and 300 mRL. HM sands are interpreted to be a dunal-style accumulations deposited on a plateau formed by an Eocene-aged paleo-shoreline.Image is exploring for Cainozoic HM sands associated with strandlines and aeolian dunal occurrences.The lithological sequence includes a 1 to 18 m thick unit of medium- to fine-grained yellow-brown sand, comprising mostly quartz grains, sub-angular to sub-rounded with good sorting which characterises the upper to middle section of the deposit. This unit is interpreted to be of aeolian origin and hosts the bulk of the HM concentrations. This unit lies above, and is flanked by, a grey sandy-clay unit, containing a 1 to 6 m thick “transitional” zone of rounded to angular and moderately sorted material at the top of the unit, above angular to sub-rounded, moderately to poorly-sorted sandy clay. HM is concentrated within the sand unit and the top of the sandy-clay unit. The base of the sandy-clay unit is interpreted to represent the top of the Yarragadee Formation. Intermittent clay and areas of iron induration were intersected by drilling. The induration is characterised by poorly cemented soft to very soft (immature) silt-sandstone, some of which is weakly iron stained. DimensionsThe Yandanooka deposit is 6.0 km long and up to 2.5 km wide. Mineralisation is between 1 m and 21 m thick, with an average thickness of 7 m. It contains a zone of higher-grade mineralisation (+3% total HM) that extends for 3.5 km and is up to 1.3 km wide. The higher-grade zone is between 1 m and 10 m thick, with an average thickness of 4 m.
