The area is underlain by Lower Cretaceous Skeena Group sediments (Kitsum Creek Formation) comprised of conglomerate, greywacke, shale, and tuff. The sediments are intruded by a Cretaceous to Tertiary dioritic porphyry with associated dikes.

Locally, the rocks consist of flat lying sandstones and con- glomerates and a series of argillites and quartzites intruded by a mass of diorite. On the Viking, the flat lying conglomerate and sandstone are crosscut by stringers of pyrite carrying low values of gold and silver. Mineralization appears to infill fractures in the conglomerate. Test pits along the hillside show the minerali- zation is widespread in an area of about 215 metres in length.