Esowista Peninsula (Tofino located at tip) is underlain by rock of the Late Jurassic to Early Cretaceous Pacific Rim Complex. This is a highly disturbed assemblage consisting mainly of greywacke and argillite with minor ribbon chert, basic volcanics, limestone and conglomerate. The rocks are generally highly faulted and sheared and in many places are tectonic melanges. At the tip of the peninsula these rocks are intruded by a granodiorite porphyry plug of the Early to Middle Eocene Tofino Intrusive Suite (formerly Catface Intrusions).

The Tofino occurrence consists of a small stockwork of quartz veinlets containing molybdenite, chalcopyrite and pyrite hosted by the Tertiary plug.