The B zone is underlain by metamorphosed greenschist facies submarine pillow and massive basalts of the Vancouver Group, Upper Triassic Karmutsen Formation, with numerous interflow lenses of limestone, argillite and chert. These rocks are in fault contact with Tertiary Masset Formation rocks consisting of flow banded rhyolite intruded by gabbro with associated basalt dikes.

A large northwest dipping quartz vein, 900 metres long and up to 12 metres wide, trends northeast along the fault contact between the gabbro/rhyolite and basalt/sediment packages of rock. The breccia vein is comprised of quartz, basalt, rhyolite and gabbro breccias which are cut by quartz and calcite veins and contain fragments rimmed by chalcedony. Highly foliated mylonite occurs along the quartz vein.

Pyrite and gold mineralization occur within the quartz vein and surrounding wallrock. A sample of moderately fractured and quartz veined foliated rhyolite assayed 56.6 grams per tonne gold and a 15 centimetre sample, 60 metres to the northeast, of quartz stringers cutting gabbro assayed 6.48 grams per tonne gold (Assessment Report 11084).