A licence area centred about 100 km north-east of Streaky Bay township, on the south-western perimeter of the Gawler Ranges, was taken up to explore for possible economic buried IOCG mineralisation or Tunkillia stye fracture controlled lode gold associated with Hiltaba Suite granite plutons affected by hydrothermal alteration originating from a fault splay of the Yarlbrinda Shear Zone. Possible primary and/or secondary redox type uranium mineralisation constituted a secondary exploration target. Research undertaken by the licensee had identified a promising prospect situated near Toondulya Bluff, where previous exploration done by Homestake Gold during 1996-97 had located a calcrete gold geochemical anomaly measuring 8 km by 2 km, overlying deeply weathered Precambrian basement concealed by Cainozoic cover. The identification of this anomaly resulted from that company performing a large geochemical survey covering 4,000 square km. At the anomaly, the reported maximum gold content in surficial calcrete was 39 ppb Au. In the subject licensee's opinion, prospectivity factors such as the original broad sample spacing (1 km x 1 km) and the transported surficial cover (aeolian sand, calcrete and estuarine clays), the anomaly's location at a major structural triple junction related to the Yarlbrinda Shear Zone, the known occurrence of redox front - style uranium mineralisation to the west, a tectonic focus within the major crustal-scale structures of the Arcoona Horst and GRV caldera margin, and the existence of an associated magnetic rind at a granite contact, when taken together, suggested that the soil gold anomaly warranted follow-up. Based on his comparative analysis with other areas, the Toondulya anomaly, given the nature of the cover sequence, is not dissimilar to the strike length and anomaly magnitude of known basement gold discoveries along the West Gawler Gold Corridor (Barns, Tunkillia, Nuckulla Hill). Furthermore, Homestake had also found lesser satellite gold anomalies 11 km to the east and 7 km to the south-east. Homestake's exploratory aircore drilling at Toondulya prospect had then revealed a related weak bedrock geochemical anomaly, with up to 0.98 g/t Au, concentrically zoned around anomalous concentrations of up to 0.17% Cu. This appeared to confirm that the calcrete sampling technique had been effective in locating mineralisation under 60-80 m thick transported overburden. A subsequent detailed gravity survey, aimed at confirming a broad one station high anomaly on historical data, defined a sub-circular 6 x 6 km moderate gravity high partly coincident with and adjacent to the geochemical anomaly. However, when Homestake allowed tenure of the ground to lapse in 1997, no deeper drilling of the Toondulya prospect had been undertaken, nor were the satellite geochemical anomalies tested, nor was the relationship between the large gravity anomaly and the adjoining gold anomaly resolved. Information gleaned from Homestake's shallow aircore drilling logs, for holes spaced 1-2 km apart and mostly ending in saprolite, suggested that the bedrock geology at Toondulya consisted of a magnetite-bearing, potassium rich I-type granite with mylonitised and metasomatised contacts with mixed sheared and mafic dyke - intruded older Proterozoic schistose and gneissic rocks, within which are potassic altered zones grading outwards to epidote/red rock altered zones. During the first three years of tenure, the licensee conducted no field work, instead focussing on previous exploration data for assimilation and review, with salient observations as outlined above. He prepared numerous maps and images to illustrate his conceptual model of the licence's prospectivity. After funding from JV partner Argo became available during licence Year 4, field work commenced. A detailed low-level airbone magnetic/radiometric/DEM survey of 9194 line km was flown over the entire licence during December 2006, along east-west lines spaced 50 m apart, utilising a 50 m sensor mean terrain clearance. This was followed by the acquisition of a detailed ground gravity survey across the northern two-thirds of EL 3167 during June-July 2007, when more than 2000 stations were read at 400 m x 400 m spacing. Interpretation of the new gravity data indicated a dense, non-magnetic source for the 8 km x 8 km Toondulya anomaly, which the geophysical consultant believed might lie at shallow depth, and thus not be caused by a mafic body, as had previously been suggested. Interpretation of the combined new magnetic and gravity data was used to generate a solid geology and target identification map to guide ongoing exploration. During December 2007-January 2008, the partners conducted detailed soil calcrete sampling (1984 samples assayed) and ground scintillometer scans along short traverses and 50 m spaced grids over 13 selected aeromagnetic and radiometric anomalies, 9 of which it was thought could have IOCG potential. Most of these geophysical anomalies did not relate to past recorded gold-in- alcrete anomalies, so the aim of the new sampling programme was to assess whether any calcrete geochemical signatures were spatially associated with geophysically defined structures. From the assay results received in June 2008, it appeared that the Area 3 sampling traverse, positioned immediately to the west of the previously defined Hiltaba prospect gold-in-calcrete anomaly, was unusual in having low order silver values spread over a 250 m distance, with two consecutive samples yielding 5.8 and 4.1 ppm Ag respectively. While the geochemistry of silver in pedogenic carbonate-rich profiles was unknown, silver-in-calcrete values of this magnitude were considered significant. It was observed that the uranium-in-calcrete data showed a poor correlation between ‘elevated’ values and areas defined as anomalous based on airborne radiometric data. Likewise, the scintillometer readings gave rise to unexpectedly variable correlations with airborne uranium channel data, e.g. the Area 5 ground traverses gave elevated scintillometer responses correlating very well with ‘high’ airborne uranium and total count responses, but in contrast, the Area 15 traverse, over a low-order airborne uranium and total count anomaly, gave rise to a particularly strong scintillometer response. Area 11, a modest U-Th-K anomaly in the airborne data, provided the highest uranium-in-calcrete response but only very weak scintillometer responses. Overall, the geochemical data suggested that the use of uranium-in-calcrete as a universal guide to uranium occurrence is equivocal. During licence Year 6, the onset of the Global Financial crisis caused Argo to abandon field work for the time being. The company had decided beforehand to attempt an orientation biogeochemical survey over its various calcrete geochemical anomalies of interest, to settle on the best sample medium to use for any later more extensive such survey across a sand-dune dominated but strongly vegetated regolith terrain. In the interim, Argo performed a repeat assay check on its earlier silver-anomalous calcrete samples, which had looked very out-of-place in an otherwise background trace metal content area. The results did not confirm the original silver value, so clearly they were due to contamination in the analytical processing train. During licence Year 8, Argo commissioned Xstrata Copper Ltd to undertake complete reprocessing and 3-D modelling of Argo’s gravity data from a positive elliptical Bouguer anomaly disclosed in the north-western part of EL 4284. This modelling outlined a well-constrained, roughly cylindrical body with four diametrically opposed apophyses reaching up to the shallow subsurface. The gravity feature was interpreted as a granitic intrusion some 10 km in diameter, with the excess density possibly being contributed by dispersed sulphides. It was believed that the excess density was not due to iron oxide alteration, nor to primary iron-titanium oxide concentrations. The apices of the apophyses appeared in the 3-D model to have been "planed off", suggesting that they may have been exposed to erosion prior to being buried beneath a Recent sand dune field. In other related work, Search Exploration Services of Adelaide was engaged by Argo to conduct an orientation IP survey over 11 survey lines designed to probe the resistive character of the bedrock at the above modelled four apophyses. Only Lines 1 (6452000N) and 10 (6450500N), for a total of 6 line km, were completed during the year. The IP data was processed and modelled for Argo by Xstrata Copper using in-house proprietary routines. It indicated that there was the possibility of ~1-2% disseminated sulphides occurring in the granitic rock at about 150 m depth. Also during 2010-11, Argo collected 5 calcrete, two rock chip and 2 soil samples from the still open northern end of the Hiltaba prospect gold-in-calcrete anomaly. These samples returned gold values ranging from 1 to 37 ppb Au. No further work ensued on the subject tenement during Years 8 and 9. Argo reported that it intended to carry out and was planning a number of RC test drillholes on preferred geophysical targets, to explore for possible gold mineralised shear structures and for copper-bearing skarns in the vicinity of the upper parts of the model-indicated granitic intrusion described above. However, re-assessment of its corporate objectives late in 2012 caused it to allow tenure of EL 4284 to lapse in July 2013 without making an application for renewal, and so the drilling did not eventuate.