At the King showing, disseminated chalcopyrite occurs within a diorite sill of the Proterozoic Moyie Intrusions intruded into the Helikian Kitchener Formation (Purcell Supergroup). The sulphides are concentrated within, and adjacent to northwesterly striking cross fractures in the sill. Typical of similar showings in the area, quartz is the gangue within the veins.