At the Tom showing, a large (1 km wide by 10 km long) quartz diorite-quartz monzonite multi-zoned intrusive dike forms the eastern boundary of a Middle Triassic to Upper Triassic Nicola Group package. The eastern contact of the dike has undergone extensive shearing with silica and carbonate metasomatism. In fault contact with the eastern boundary of the dike are phyllitic greenstones.

In 1986 Gabriel Resources collected anomalous samples at the junction of northeast trending structures or topographic lineaments and the large dike. A ground magnetic survey provided good definition of both the dike boundaries and these topographic lineaments. Reconnaissance I.P. survey lines across these junctions located possible sulphide concentrations which may be the source of the gold. Three drill holes ((22, 23 and 25) tested the geology of the dike intersected sections containing anomalous gold (0.822 gram per tonne gold)(Assessment Report 15926). These holes were drilled to test the margins of the dike, however, they did not reach the dike contact. Very little sulphide mineralization was encountered.

See Jo (093G 004) for details of Gabriel Resources work in the region during the 1980s.