In a search for possible Mount Gunson - type copper mineralisation thought to have been formed within Adelaidean dolomitic metasediments in the southern Island Lagoon shore area, a field reconnaissance was carried out to look for postulated vectors to mineralisation of this type, viz. structural lows and tight jointing in the rocks, plus disconformable lithological contacts between certain Neoproterozoic and Mesoproterozoic rock units. Because only 25% of the area has exposed outcrop, the stratigraphic information gained was limited. However, none of the targeted parameters could be observed. Instead, the Corraberra Sandstone Member and Simmens Quartzite Member of the younger Tent Hill Formation were the outcropping units.