A basinal region located in the vicinity of Marla and extending for approximately 75 km to the north north-east, that borders the Musgrave Province, has been explored by farminee Eromanga Uranium under a joint venture agreement with licensee...
A basinal region located in the vicinity of Marla and extending for approximately 75 km to the north north-east, that borders the Musgrave Province, has been explored by farminee Eromanga Uranium under a joint venture agreement with licensee Maximus Resources, notionally to look for for all minerals, but particularly for possible palaeochannel uranium deposits formed within Mesozoic cover rocks. The sandstone sediments within the five Abminga Project tenements were thought to lie in a favourable setting to receive uranium-bearing groundwaters shed from the Musgrave basement rocks over a long period of time. Previous exploration records indicated the presence of facies suitable to host roll front style mineralisation, and some downhole radiometric anomalism, within these sediments. During June-July 2007 Eromanga Uranium acquired part of a 9345 line km combined airborne TEM / magnetic survey over the now surrendered subject licence areas, looking for any sinuous conductive bodies in the Jurassic Algebuckina Sandstone which could constitute drillable palaeochannel units. No EM responses of this type were detected. Drilling results obtained from the adjacent Abminga East Project area confirmed that observed airborne EM anomalism is associated with the conductive Cretaceous Bulldog Shale rather than with saline palaeochannel groundwaters, and the EM response seen over the surrendered Abminga Project licences is interpreted to have a similar cause. Despite the failure of the airborne RepTEM system to map conductivity changes in the target horizon, it did effectively map conductivity variations within the cover above the Bulldog Shale, making it possible to identify Tertiary drainage patterns. The EM data also revealed conductors within shallow Neoproterozoic strata present in the southern tenements. In separate work, 5 rock chip samples were taken in the north-western portion of Mount Weir EL 3600 from Palaeoproterozoic gneissic basement outcrops of the Yoolperlunna Inlier which had shown radiometric anomalies. The assay results gave between 0.16 and 0.92 ppm U.
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