In situ analysis of pyrite in sedimentary rocks can provide an effective exploration method for sedimentary copper mineralisation. This report presents results of regional analysis in the Stuart Shelf which builds on previous pyrite sampling in the region by CODES that is also publicly released in this report for the first time.

It was found that early pyrite (framboids and recrystalised framboids – Py1) were at least as enriched as later generations, demonstrating syngenetic to diagenetic enrichment at known mineralised sites. Also supporting this was metal enrichment in pyrite occurring in the middle as well as base and top of the host unit. The Tapley Hill Formation was shown to be very enriched in copper compared to common marine shales underlining the sedimentary copper potential of the Stuart Shelf.

Several geochemical indices are used in this report to distinguish distal from ore signatures. These indicate that in addition to the known mineralised regions of Myall Creek, Mount Gunson and Emmie Bluff, pyrite chemistry indicates prospectivity in a region between Pernatty Lagoon and the southern end of Lake Torrens.