Historically, most geochemical data collected from drillholes by explorers in South Australia comprised assays for target commodities and pathfinder elements, thus the potential for the full suite of critical minerals in existing deposits remains unknown. For this reason, re-sampling and re-assaying of existing drill material from major projects was undertaken to assess their critical mineral potential. A total of 40 deposits was selected representing a variety of mineralisation styles to better define critical mineral potential across South Australia using historic company records and sampling drillholes from the South Australia Drill Core Library in Tonsley. This report focuses on the Kalkaroo, Portia and Shylock deposits of the Curnamona Province.