Similarities, yet differences: Olympic Dam, Oak Dam West, Wirrda Well, Island Dam and Acropolis IOCG deposits, Olympic Cu-Au Province, South Australia

The Olympic Cu-Au Province hosts not only one of the world's largest Cu-Au-U deposits, Olympic Dam, but also Prominent Hill and Carrapateena. Additionally, REEs, other critical minerals (e.g. Sb, Bi, C, Co, W, Se, Te) plus F, S, As, Fe, Mo, Pb, Sn, Y, Zn are present at concentrations greater than mean continental crust. Other IOCGs (Fe-oxide Cu-Au) occur within a radius of similar to 150 km from Olympic Dam, which broadly defines the Olympic Cu-Au Province. These mineralised occurrences include, but are not limited to, Acropolis, Wirrda Well, Island Dam, Oak Dam East, Vulcan, Titan, Emmie Bluff, and the recently discovered Oak Dam West. Like any other global ore deposit type, IOCGs in the Olympic Cu-Au Province display similarities (e.g. hydrothermal magnetite/ hematite, hematite ages, U-Mo-Sn-W enriched hematite, Cu(+/- Fe) sulfides) and differences (e.g. host lithologies with different ages, nanoprecipitates/inclusions preserved in Fe-oxides, mineralization styles and depths of post-mineral cover). Simple down-drillhole magnetic susceptibility and total Fe concentration profiles reveal some of the complexities of these deposits. However, when coupled with micro- to nanoscale mineralogical characterisation, the macroscale trends can be articulated in terms of systematic transitions from magmatic magnetite to hydrothermal magnetite and finally to multi-generations of hematite.