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 Lion occurrence is underlain by amygdaloidal basalt of the Karmutsen Formation cut by a shear structure. The shear zone hosts a pyritic, drusy quartz vein mineralized with minor chalcopyrite. The vein locally contains angular wallrock fragments. A grab sample from the vein assayed 3.16 grams per tonne gold and 0.45 per cent copper (Assessment Report 18672).