The Acadian showing is located near the eastern margin of the Stikinia Terrane in south central British Columbia. The dominant rock types in the region are metabasalt, limestone and argillaceous metasediments of the Mississippian to Triassic Cache Creek Group. These are intruded by the dioritic to quartz dioritic Granite Mountain Pluton and the (?)Cretaceous Sheridan Creek Pluton. The Granite Mountain Pluton has been affected by regional metamorphism (greenschist facies) and deformation along with the enclosing Cache Creek Group.

The limited outcrop in the area indicates that the showing is underlain by quartz muscovite schist of the Cache Creek Group, intruded by granodiorite which is probably related to the Granite Mountain Pluton. Chalcopyrite and pyrite occur in quartz veins cross-cutting the schist, in quartz-rich zones parallel to the foliation of the schist, and as disseminations in the granodiorite.