The Kay showing is located within the Callaghan Creek roof pendant, an assemblage of dominantly volcanic rocks of the Lower Cretaceous Gambier Group, preserved within the Jurassic to Tertiary Coast Plutonic Complex. The property is underlain mainly by andesitic volcanic rocks which have been cut by basaltic dykes.

Mineralization consists of galena, sphalerite and minor chalcopyrite within quartz-carbonate veinlets and in shear zones within the andesitic rocks.