On 19/1/70 Minefields Exploration NL were granted an option over the Truro Talc and Joe's Hill talc deposits situated some 60 miles north-east of Adelaide. Then, during April 1970 a Stage I exploration programme was undertaken, consisting of delineation drilling (67 holes totalling 5926 feet at Truro Talc and 48 holes totalling 5313 feet at Joe's Hill), trenching (1420 feet of trenches 2 feet deep and 8 feet wide), and ore sampling (1870 samples sent for mineralogical tests to Minex in Melbourne or to Amdel in Adelaide). Subsequent ore reserve calculations have revealed combined measured, indicated and inferred ore reserves in the two deposits that are of the order of 700,000 long tons grading about 77% talc. However, this figure can be increased or decreased depending on the chosen cut-off grade parameters for talc and impurities such as iron. A further, limited drilling programme will be necessary prior to starting any mining operation, for finally blocking out the talc orebody. Further exploratory work is also recommended to look for other, similarly emplaced, Cambrian-hosted fold hinge talc occurrences in this favourable region, if a viable operation can be established to mine the known deposits.