Combined annual technical report GR144 Mount Denison Group for period 2 April 2012 to 1 April 2013

Abstract

No on ground exploration activities have been carried out during the reporting period, however, an Airborne Electromagnetic (Tempest) survey was carried out by Fugro covering parts of EL 26287 and EL 28512. The survey involved 313 line kilometres (500m line spacing, Northeast oriented). The objective was to refine the geological understanding in the area to assist in exploration drillhole targeting for uranium mineralisation. A large palaeodrainage network is evident as a broad sinuous conductive 'plume', which emanates southeast of the survey area in the Reynolds Ranges, and propagates northward across the flat landscape to the north. This palaeochannel was probably deposited in the Tertiary and is now providing a conduit for northward dispersion of saline groundwater. The surrounding sand plain is much less conductive and is interpreted to be a similar thickness sequence as the palaeochannel, but comprised of less permeable sands with fresher groundwater. The modern drainage systems, including the Lander River, are not reflected in the subsurface electromagnetic data, indicating that the underlying palaeochannels are of an older generation when the depositional environment and setting were different to today. The boundary between interpreted conductive and resistive sediments correlates to anomalous uranium intersections made by Toro at Mount Denison in 2010. An infill drilling program is planned for the next reporting year to follow up existing anomalous gamma intersections in the northeast corner of EL 26287.