The G.H. showing is located near the eastern margin of the Stikinia Terrane 1 kilometre southwest of Reserve 12 in south central British Columbia. The dominant rock types in the region are metabasalt, limestone and argillaceous metasediments of the Pennsylvanian 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 G.H. showing occurs within granodiorite which outcrops at the northern end of Cuisson Lake and is considered to be part of the Granite Mountain Pluton. The intruded rocks are limestone and metavolcanics of the Cache Creek Group. Chalcopyrite and molybdenite occur as disseminations in the granodiorite.