Detailed mapping of the Moorilyanna copper prospect has indicated that the mineralisation is confined to a gabbro dyke which has intruded a folded lower Proterozoic metasedimentary sequence along a sheared synclinal fold axis. The mineralisation is intimately associated with shearing, and is of epigenetic origin. Copper minerals, chiefly malachite with minor chalcopyrite, are sporadically distributed in calcite lenses filling narrow discontinuous shears and fractures within a 100 foot wide shear zone. Geochemical soil sampling has defined a small anomalous area with copper contents ranging from 300 to 500 parts per million. The limited extent and the sporadic distribution of copper mineralisation render the prospect of low economic importance. No further work is warranted at this stage.