Ongoing appraisal work conducted by CSR at the company's newly discovered Cattlegrid copper deposit that lies at the top of the Pandurra Formation has included infill rotary percussion and diamond drilling (13 holes for 554 m, including 166 m cored), ore sampling for petrographic/mineragraphic studies and metallurgical testing, the acquisition of orientation geophysical surveys (including the flying of 260 line km of INPUT aerial EM coverage at 200/400 m line spacing and 130 m mean terrain clearance), and lead isotopic age dating of the ore. Diamond drillhole LY2 (TD 667.40 m) was drilled vertically through the Cattlegrid orebody, which was shown to be only about 5 m thick below 29.4 m hole depth, although minor sulphide in fractures persists down to 123 m and also occurs in a brecciated zone at the depth interval 144-163 m. A second diamond drillhole, LY3 (TD 246 m), was drilled on a magnetic anomaly located 1 km north-east of Cattlegrid. It encountered copper mineralisation in the Woocalla Dolomite, and then passed into a system of basic dykes that are intruded into the Pandurra Formation. Two stages of basalt-dolerite intrusion can be seen in the drill core, an earlier carbonate-veined stage and a later magnetite-veined stage. This hole was ended prematurely in altered acid volcanic rocks (?Gawler Range Volcanics). Evaluation of the geophysical test data acquired at Cattlegrid showed that INPUT EM was the most responsive reconnaissance method, being able to define the resistive subcrop edge of the Tregolana Shale Member, and to outline shallow depositional troughs developed on the top of Pandurra unconformity surface. Some good to moderate IP frequency responses were obtained over the Cattlegrid orebody, but ground magnetic, SP and VHEM methods proved unresponsive. The hammer seismic refraction technique was found to be effective in detecting the buried Pandurra unconformity where it lies at depths of down to 30 m. A tentative age of 1350-920 Ma for the lead (and copper?) mineralisation at Cattlegrid was determined, with an ore remobilisation date of 950-500 Ma. Brownfields exploration undertaken by CSR to look for repetitions of Cattlegrid type stratiform copper mineralisation included the conduct and interpretation of 2435 line km of detailed aerial EM (INPUT) and aerial magnetic surveys during 1975, and regional stratigraphic drilling (191 rotary percussion holes for 5208 m) which targeted the Whyalla Sandstone / Pandurra Formation stratigraphic contact. Follow-up of selected IP and INPUT EM anomalies by rotary percussion/diamond core drilling on a 200 m grid (15 holes for 605 m, including 281 m of core) led to the discovery and delineation of the MG14 deposit (800,000 tonnes averaging 1.98% Cu over 3 m) under 20-25 m of cover 1 km north of Cattlegrid, which is thought to have formed within a channel-filling, dolomitic, laminated dark clay facies deposited near the top of the Woocalla Dolomite. Similar (>1% Cu) thin mineralised channel intercepts were also later found by drilling 16 rotary percussion/diamond core holes for 553 m (396 m cored) in the Gully area adjacent to the abandoned Main Open Cut; by drilling 20 RC holes for 690 m near the LY3 drillhole; and in drillhole MG41.