Geophysics and Drilling Collaboration Final Report for Rover Project 3D IP EL 27372

Abstract

This report provides a summary of the 3D M.I.M. Distributed Acquisition System Induced Polarisation (3D IP) and Magnetotellurics (MT) survey completed in July and August 2017 by Emmerson Resources Ltd (Emmerson) and Joint Venture (JV) partner Evolution Mining (Evolution) on EL 27372 in the Rover Mineral Field (Rover Field). The survey was partially funded by the Northern Territory Government NTDPIR/NTGS under the CORE (Creating Opportunities for Resources Exploration) initiative and the Geophysics and Drilling Collaborations Program (Round 10 2017). The Rover Field is located approximately 70km south west of the Tennant Creek Township, in the Northern Territory. Emmerson entered into a Heads of Agreement (HoA) with Andromeda Exploration Pty Ltd (Andromeda) (formerly Adelaide Exploration Pty Ltd) with a Farm-In and Joint Venture to follow over the tenements subject to this application. Emmerson has operated in the Northern Territory and the Tennant Creek Mineral Field (TCMF) for 11 years and Andromeda has operated numerous exploration campaigns consisting of geophysical surveys and drilling in the Rover Field and more specifically the tenements subject to the HoA and this proposal. Work was conducted in accordance with 'EL 27292 and EL 27372 Deed for Exploration' made between the Central Land Council (CLC) and Andromeda. The survey was a program of 3D IP over the buried Rover Field. The cover depth has historically been a major constraint in undertaking detailed exploration, which if analogous to the well explored TCMF to the north, should yield multiple deposits. This survey aimed to de-risk otherwise very high cost diamond drilling through providing subsurface information on the depth of the cover, the unconformity between the Wiso Basin and Warramunga Formation and, test the efficacy of 3D IP in pinpointing sulphide rich ironstones below significant basin and Ooradidgee cover sequences. The initial approved survey was to be undertaken in two stages consisting of an initial 'Proof of Concept' over the known Rover 4 (R4) prospect and if positive (defined by a IP anomaly), be followed by the next stage aimed at testing an inferred, metal fertile corridor that also hosts Rover 12 (R12), Rover 14 (R14) and Rover 16 (R16). The survey commenced as proposed over R4, to evaluate the final products of 3D IP over a known ironstone in the Rover Field. The survey results were disappointing with the main chargeability response occurring immediately above the copper and gold mineralisation. It appears the chargeability response is associated with the clay alteration above the deposit. The resistivity data in both the MIMDAS and the MT survey has successfully mapped the base of the Ooradidgee sediments but there is no indication of the sulphide mineralization in the inverted resistivity sections. The program changed from its original proposal to attempt to further test if pinpointing sulphide rich ironstones below significant basin and Ooradidgee cover sequences could be achieved using 3D IP without committing all the planned expenditures, therefore Rover 11 (R11), more particularly R11 East (R11E) and R11 Central (R11C) were selected to be surveyed next, as it provided the a solid greenfields target. The results from R4 were repeated to some degree at Rover 11 where the broad chargeability response appears to map alteration rather than ironstone hosted sulphide mineralisation. Considering these results the survey was terminated on the conclusion that the technique will not generate targets with a high enough probability of success to warrant additional work, and further spending would be wasted. Acquisition of the data was been designed using 100m spaced 1100m lines with transmitters extending out of the single middle transmit line by 950m. Receiver spacing was 100m on the outside and 50m on the centre line while transmit locations were 50m inside and 100m outside the grid centred over the known magnetic anomalies. This proposal provides a framework to better understand the Rover Mineral Field and has the potential to unlock additional sulphide rich, mineral deposits that have similarities to our Goanna discovery in the Tennant Creek Mineral Field. Goanna had both an EM and IP signature however, was not covered by Wiso basin sediments. Thus there is a significant technical risk in undertaking 3D IP in the Rover Field, somewhat mitigated by case studies from Rockface (Jervois) and also Olympic Dam (SA). Emmerson engaged Geophysical Resources and Services Pty Ltd (GRS) to conduct the survey.