At the Spuz A North occurrence, four northwest striking shear zones cutting altered Lower and Middle Jurassic Ladner Group argillite have been exposed in a trench. Fault gouge and pods of quartz characterize these two to five-metre wide zones, which mainly parallel foliation in the argillite. The more lithic layers also host anastomosing quartz veinlets, suggesting selective replacement.
Finely disseminated pyrite and minor chalcopyrite are associated with zones of silicification and occur throughout the host rock. Gold is reported to have been panned from samples from the silicified zones.