Since 2001, Cameco has been acquiring airborne electromagnetic data over their tenements in the Arnhem Land region of northern Australia to assist in uranium exploration. Airborne EM has predominantly been used for mapping the depth to the sandstone-basement unconformity, and geological structures that favour uranium mineralisation. Thirty-six surveys have been acquired using the TEMPEST® system over the last 12 years in the region. These surveys have historically been limited to individual tenements that were being explored at the time, and as such have been typically treated individually and in isolation to one another. Originally, conductivity models were generated using EMFlow on Z component data only. In 2012, Cameco re-modelled these datasets using the latest inversion algorithms utilising the non-geometry corrected “raw” X and Z component data. This has increased the spatial resolution of the resultant conductivity model, providing an improved product for geological interpretation. The individual surveys were merged together with no stitching, and the resultant basin wide compilation shows the excellent stability of the TEMPEST® system throughout the 12 years of surveying. Re-modelling has markedly improved the conductivity models from these surveys and allowed a basin wide compilation to be constructed to aid in exploration, particularly by providing a regional structural framework which is not always obvious at the tenement scale.


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