Three previously untested, significant gravity anomalies were the targets for 4 exploratory vertical RC drillholes totalling 750 m, put down in areas west and north-west of Whyalla by Minotaur Exploration with funding assistance from PIRSA through its PACE Initiative. The three gravity anomalies, Target 1C (Myall), Viking and Target 11, are associated with, or on the flanks of, aeromagnetic anomalies. The gravity anomalies were thought to arise possibly from buried dense haematite bodies which could have the potential to host iron-oxide copper-gold (IOCG) deposits. The drillholes encountered the following Proterozoic basement lithologies: - Target 1C (RP05R001): mainly Roopena Volcanics: altered basalts and intimately associated sediments (sandstone and minor claystone). A relatively unaltered fresh dolerite (Gairdner Dyke) was penetrated at the base of the hole, from 238-252 m depth. - Viking (RP05R002 & RP05R004): interlayered granitic and amphibolitic gneiss and, in RP05R004, narrow zones of calc-silicate altered banded metasediments. - Target 11 (RP05R003): a thick zone (102 m) of amphibolitic rock, altered metagabbro and metapyroxenite, possibly after original layered sills and characterised by high chromium assays, overlying altered granitic and amphibolitic gneiss with substantially lower chromium assays. Drill sample precious and base metal assays were generally low, with the following exceptions: - RP05R001: 1.0g/t Au at 186-188 m, and 2860 ppm Cu at 180-181 m, both intervals being associated with thin dolomite veins; - RP05R002: composite 5-metre samples and subsequent detailed 1-metre resampling from the depth interval 75-95 m returned slightly elevated uranium values, with an average of 36 ppm U; - RP05R003: a broad interval at 50-165 m depth averaged 1342 ppm Cr. A portion of this zone (140-160 m) included elevated arsenic and zinc values. Resampling at 1-metre intervals returned sporadic highs to a maximum of 1000 ppm As, and yielded a non-coincident 1050 ppm Zn. Additional 1-metre resampling of the depth interval 215-220 m (from which the original composite returned a zinc value of 3126 ppm) returned a high of 4850 ppm Zn from 219-220 m depth. In view of the disappointing economic results of drilling, and having assessed the subsurface geology at the gravity model target depths, where mafic volcanic and/or intrusive rocks of Palaeoproterozoic to Mesoproterozoic age were found, the potential for haematite-rich IOCG-style mineralisation at each of the three anomaly areas has been downgraded.