The Surprise Mountain area is underlain by rhythmically layered amygdaloidal, feldspar porphyritic and spherulitic basalt flows of the Upper Triassic Karmutsen Formation (Vancouver Group). Mineral- ized quartz and quartz-carbonate veins with variable sulphide content are associated with narrow, steeply dipping shear zones.

The Francis occurrence is underlain by amygdaloidal basalt of the Karmutsen Formation cut by a shear structure. The shear zone hosts pyritic quartz veining ranging in width from 5 to 60 centimetres. Three veins are exposed at sea level of which two were tunnelled on. One of the veins strikes 080 degrees with vertical dips. Mineralization consists of minor chalcopyrite and rarely native gold.

A recent grab sample assayed 18.1 grams per tonne gold, 97.6 grams per tonne silver, 0.34 per cent copper and 0.22 per cent zinc (Assessment Report 18672).