During 1991, mapping of manganiferous ironstones by WMC centred on the Jamieson Tank Prospect located in the southwest portion of the Carappee Hill tenement (see figure below).

The mapping by WMC identified manganese occurrences over a strike length in excess of 8 km. The width of the zone containing manganese was estimated at between 30 and 100 metres (known as the Jamieson Tank beds).

Rock chip samples collected during the mapping exercise of 1991 from the Jamieson Tank beds returned manganese grades of up to 38.2% Mn.

Follow up shallow drilling by WMC in early 1993 intersected multiple near surface narrow lenses of manganiferous clays and occasional massive manganese oxides and returned manganese assays in the range of 0.05% to 31%.

The Jamieson Tank beds comprise layers of manganese and iron rich rock with maximum down hole widths of up to 3 metres with interbeds of clay, chert and ferruginous sediment. Several thinner, less continuous trends which flank the main manganiferous zone were also identified.