On Gowland Island, in Gowland Harbour of Quadra (formerly Valdes) Island, a tunnel was driven for 37 metres prior to 1913. Within this tunnel a shaft 6 metres deep and a raise of 4.6 metres was made. The workings followed a zone along which Upper Triassic Karmutsen Formation volcanics are sheared into a chlorite schist which contains a few scattered grains of chalcocite.