Exploration of the known copper-bearing Lower Adelaidean metasediments outcropping in the Willouran Ranges to the south-west of Marree addressed the many historical mine prospects and also the region as a whole. Initial work comprised a regional reconnaissance stream sediment geochemical survey (6000 samples; approx. 20 per square mile) and geological mapping. Six areas of strong, > 40 ppm Cu copper anomalies were found, plus several less intense (2 to 3 x background) anomalies, that all lie within a reduced target area of 24 square miles. These localities were gridded, and detailed soil sampling (eventually totalling 6073 samples) was done to define drilling targets. At Boorloo prospect a fairly consistent zone of soil copper anomalism was revealed, from 400 up to 800 feet wide and with a strike length of about 3000 feet. This zone was geologically mapped at 1:1200 scale and then wagon drilled along 5 traverses, the 69 holes being 50 feet apart and generally 50 feet deep, mostly inclined at 45 degrees to the west. The drilling indicated that a nearly 400 feet thickness of strata is mineralised, containing a number of intervals 20 to 40 feet thick averaging 0.3% Cu. The richest intercept averaged 1.4% Cu over 6 feet. The tenor of this near-surface mineralisation, although sub-economic, gave encouragement to conduct follow-up diamond drilling to test the same horizons at depth within the sulphide zone. During the period July-November 1965 two inclined diamond drillholes for a total penetration of 1367 feet 9 inches were completed. Hole DDH B1 encountered interbedded arkosic gritstones and dolomitic siltstones, with some conglomerate bands, of the target Serle Member of the Tapley Hill Formation. The downhole core sample assay results were disappointing, the best intercept being 0.4% Cu from the depth interval 651'-660' 6"). The mineralisation is exclusively pyrite-chalcopyrite, occurring principally as void fillings in the sediment matrix. Hole DDH B2 gave very similar and equally disappointing results, although in this hole chalcocite and minor native copper are also present as disseminated fracture fillings in the gritstone and conglomerate. The best mineralised intercept assayed 0.46% Cu over the depth interval 189'-201' 11", and another intercept returned 0.30% Cu from the depth interval 260' 1"-278' 11". At Breaden Hill prospect, the soil sampling outlined one copper-anomalous zone approximately 100 feet wide by 850 feet long. Here visible malachite within the Serle Member occurs in a dolomitic shale and in shale breccia formed by faulting and folding. Wagon drilling (4 vertical holes for 116 feet) done on both limbs of an anticlinal structure revealed four separate mineralised zones, each of which varies from 3-16 feet thick and is ~300 feet long. The complete mineralised section averages 2.4% Cu over about 42 feet thickness of strata. Another fourteen prospects were inspected to determine their mineralisation environment and likely extent, with the majority having some soil sampling done to indicate possible potential. No drilling was carried out on them, however, for reasons explained in the final report. A complete assessment of the assembled field data resulted in the licensee concluding that the subject area is unlikely to contain substantial tonnages of viable ore.