The GKO occurrence is located approximately 1.5 kilometres southeast of Plughat Mountain, near the headwaters of Goodasany Creek.

This occurrence is hosted in the Upper Triassic Plughat Mountain Formation, part of the Middle Triassic to Lower Jurassic Takla Group. The Plughat Mountain Formation is a thick sequence of augite-bearing, mafic to intermediate(?), calcalkaline to alkaline pyroclastic rocks, massive flows and lesser epiclastic rocks. In this area, the Plughat Mountain Formation is the upper volcanic sequence of the Takla Group. The lower, sediment-dominated sequence of rocks, are part of the Middle-Upper Triassic Slate Creek Formation (Takla Group). To the northeast, the Takla Group is in fault contact (the Manson fault zone) with the Pennsylvanian to Permian Nina Creek Group. To the south, the Takla Group has been intruded by the Cretaceous Germansen batholith, a multiphase granitic to granodiorite intrusion.

Mineralization occurs in a 1-metre wide shear zone, consisting of fractured siliceous lapilli tuffs of the Plughat Mountain Formation. A small quartz vein, less than 3 centimetres, occurs in the middle of the shear zone. The quartz vein is vuggy and sparsely mineralized. Fractures within the lapilli tuff are filled with malachite and the rock itself contains trace amounts of disseminated pyrite and chalcopyrite. A grab sample of the sheared, siliceous lapilli tuff analysed 44.1 grams per tonne silver and 1.2223 per cent copper (Assessment Report 20923). Minor amounts of molybdenum has also been reported (16 ppm).