The known Myall Creek stratabound copper occurrence located ~23 km north of Whyalla, which was discovered in 1975 by Australian Selection, consists of low-grade (0.3 to 2.2% Cu) Zambian Copperbelt or Kupferschiefer - style copper sulphides extending over an area of about 3 square km. The higher-grade portion of the deposit lies within a poorly defined broad zone (~3 km x 15 km) of low-grade Cu-Zn-Pb-Ag mineralisation which occupies a thin, 0.5-2.0 m thick sedimentary horizon at the base of the Neoproterozoic Tapley Hill Formation, at depths of between 50 and 200 m. Minotaur conducted a dipole-dipole IP survey at this prospect in late 2006 which defined a number of highly chargeable bodies present at the right depth and in close proximity to the previously found copper mineralisation. Assistance was subsequently sought and successfully obtained from PIRSA through Year 4 of the PACE Initiative for subsidised drill testing of these chargeable IP anomalies. The PACE project aims were to appraise the effectiveness of the geophysical technique in exploring for deposits of this type in the eastern Gawler Craton/Stuart Shelf region, and hopefully, to also discover other new high-grade zones of stratabound mineralisation within the basal Tapley Hill Formation. Four vertical RC drillholes (total penetration 529.9 m, of which 83.9 m were diamond cored over key stratigraphic intervals in 2 holes) were drilled in June 2007 over the highest chargeable IP anomaly seen at the western end of the southernmost IP line, but only the two cored holes, MC07RD01 and MC07RD03, reached the targeted base of the Tapley Hill Formation. Disappointingly, the results gained indicate that the highly chargeable IP anomalies reflect the abundance of disseminated pyrite within thinly laminated shales and conglomeratic sandstone beds over a total accumulated thickness of ~10 m, rather than of copper-bearing sulphides such as bornite and chalcopyrite. Aside from minor anomalous zinc and cobalt recorded over narrow intervals in drill cuttings and core, the base metal geochemical values overall were consistently very low. However, based upon a post-PACE project assessment of historical records of previous broadly-spaced mineral drilling done on the Stuart Shelf, a strong apparent correlation has emerged between the tenor of mineralisation found within the Tapley Hill Formation and the nature of the underlying stratigraphic unit. The highest copper values (e.g. as encountered in former company exploratory drillholes UB1, UB3, UB4, PUB27, SAU12) often occur where black shales of the Tapley Hill Formation directly overlie coarse-grained sandstone of the Pandurra Formation, rather than basalt of the Beda Volcanics. This evidence for a sharply defined redox boundary developed above the Pandurra Formation suggests that an interaction between oxidised and reduced pore fluids may also have been a significant contributor to the formation of mineralisation in the Myall Creek area.