Five conjoined exploration licences covering the buried central and northern Benagerie Ridge basement province that is comprised predominantly of Mesoproterozoic volcanic and intrusive rocks, have been explored for possible economic iron oxide - associated copper-gold (IOCG) mineralisation, as well as for possible secondary, sediment-hosted uranium mineralisation that might be present in the 150-350 m thick Mesozoic and Tertiary cover rocks. Newcrest Mining took up the ground to investigate a number of subtle gravity anomalies that had been revealed by a PIRSA regional gravity survey which was done at 2 km x 2 km station spacing early in 2005, which appeared to coincide with aeromagnetic anomalies originating from the basement. The licensee immediately followed up these anomalies during Year 1 of tenure by acquiring infill gravity data during August-September 2005, when a total of 1757 stations were read at 500 m x 500 m grid spacing on the subject licences, including 457 new stations on EL 3352 and 816 new stations on EL 3353. These data defined two robust gravity anomalies, labelled "C" and "I", which the company considered were worthy of drill testing. Anomaly “I”, located wholly within EL 3353 at approximately 448500E 6590000N, has a residual magnitude of ~1 mGal, but has no direct magnetic anomaly association. Anomaly “C” is located, and is spread across the tenement boundary separating EL 3352 from EL 3019 to the north, at approximately 438000E 6610000N (the latter is a JV tenement held between Newcrest and PlatSearch NL). This anomaly has a residual magnitude of 1.5 mGal and lies adjacent to a subtle magnetic high to the north. Early in June 2006, Newcrest drilled a vertical rotary mud/core tailed precollar hole at Anomaly “I”, reaching basement at a much shallower than expected depth of 110 m. The sedimentary cover comprised Quaternary, Tertiary and Cretaceous sediments. No artesian groundwater flows were struck. The hole was extended into the Mesoproterozoic basement with a short (2.6 m) PQ core run, whereby it encountered a red-brown, massive porphyritic rhyolite. Assay results returned from three samples of unaltered basement core were very low, with no significant gold or copper values (Au <1 ppb; Cu <4 ppm). Plans for deeper diamond drilling of Anomaly "I" were then shelved, owing to the fresh nature of the basement rock and its weak trace metal content. Anomaly “C” was drill tested by hole BRD005, which also encountered fresh volcanic rock at a shallower than expected depth of 148 m. This hole was carried to a TD of 150.6 m, and stopped. Both gravity anomalies “I” and “C” were now considered by Newcrest to reflect the effects of basement topographic highs along the Benagerie Ridge, rather than accumulations of dense mineralised material. No field work was done on the project licences during Year 3, Newcrest's activities instead being restricted to an ongoing desktop assessment and review of magnetic targets. As part of this review, a high priority coincident magnetic/gravity anomaly at the Lakes prospect on EL 3354 was inspected on the ground with a view to determining logistics for drilling of this target. This particular prospect is situated on a large salt lake which has aboriginal heritage significance. A brief field inspection/assessment of EL 3353 was also undertaken, to determine the practical issues of drilling a magnetic anomaly located ~ 2 km to the south of drillhole BRD001. During Year 4, Newcrest continued to review historic exploration data, but did not generate any additional basement IOCG targets. After May 2009, Callabonna Uranium designed a broader work programme for when it would assume management of the project ground (to be called Curnamona South), the first stage of which was a large airborne EM (TEMPEST) survey to be flown at a suitable line spacing to map palaeochannels. Discussion were held with contractors and neighbouring tenement holders to ensure survey efficiency. During Year 5 of tenure, Callabonna Uranium contributed, via paying for infill airborne EM data acquisition over an area of 5142 square km, to Geoscience Australia's Frome Embayment Airborne EM Survey which had commenced during May 2010. The infill AEM flight lines, which the new licensee specified should be flown at 2.5 km line spacing, extended across the five Curnamona South Project tenements and into surrounding areas held by two other companies. The final processed survey data became available to the subsidisers in April 2011 under a 12-month exclusive access arrangement, and was immediately interpreted by Callabonna Uranium and a drilling programme planned, which focussed on the interpreted northwards-trending extensions of the Curnamona and Lake Namba palaeochannels within EL 4586. During September-October 2011, 26 vertical open aircore holes for 2537 m were completed. Most of the holes were around 120 m deep, and were stopped below the Eocene Eyre Formation in grey clay. The clay was presumed to lie on or be part of the Cretaceous Bulldog Shale (Marree Group), but the assignation was not certain. All of the holes were probed inside the rods immediately after completion, using a 33 mm diameter gamma ray radiometric logging probe run inside a 50 mm thin-walled inner tube set inside the NQ drill string. Only one hole, CUS012, encountered a single logged radiation spike of 67 ppm eU3O8 at 108-109 m depth which exceeded the 50 ppm eU3O8 grade cutoff; when the corresponding sample interval (109.5-111 m) of drill cuttings was assayed three times by XRF, it returned values of between 50-60 ppm U, confirming the radiometric anomaly. Based on its early drilling results, Callabonna Uranium believed that observed changes from more oxidised conditions in the Namba Formation and in the underlying Eyre Formation to less oxidised nearer the basement in EL 4586 suggested the possibility of finding a regional REDOX front heading to the north-east into the adjoining EL 4585. Past mobility of uranium in the area is confirmed by the radiometric anomaly encountered in CUS012, which occurs in a markedly dark, partly clayey interval within an Eyre Formation sand bed, this stratum appearing also to be geologically anomalous. Also at this time, Callabonna Uranium began collaborating with Geoscience Australia (GA) and PIRSA on the Frome/Callabonna sub-basin regional mapping and sedimentology study, and contributed its current interpretation into a GA workshop held in November 2011. During Year 6 of the project, Callabonna Uranium found that the exploration results which it had so far obtained were not sufficiently interesting to investors to allow the company to raise enough capital to keep exploring in this region. There were other factors as well. The company had lost some faith in the ability of AEM to directly target buried channel sediments, leaving only expensive regional grid drilling as an option. Organising field visits to obtain site clearances by the Adnymathanha Native Title custodians was also found to be expensive, and added 25% to the cost of drilling. Furthermore, dealing with the ERD Court to try to gain an order for allowing access into areas outside the registered Native Title claim boundaries became problematic during February 2012. Consequently, Callabonna Uranium negotiated an Asset Sale Agreement with Renaissance Uranium Ltd between April and July 2012, to facilitate the transfer of ownership and exploration commitments for all its South Australian titles to Renaissance, except for two licences, ELs 4852 and 4853, where Callabonna wanted to retain an option over untested basement IOCG targets associated with the "Benagerie Shear Zone" (Williams and Betts, 2009). No on-ground exploration took place on the project licences during Years 7 and 8, firstly while the transfer of ownership was in progress, which was concluded on 14/8/2013, and thereafter owing to unforeseen corporate financial constraints which caused Renaissance/Renascor to also attempt to attract a joint venture partner to help meet licence work expenditure commitments. When the situation did not improve, Renascor decided during May 2015 to jointly surrender all five Curnamona South licences, and concentrate its attention instead on the Curnamona North Project ground which, from its recent interpretation of the 2010 AEM data, it considered was more prospective for sedimentary uranium.