An extensive, complex shear system occurs in intrusive and gneissic volcanics and metasediments of the Coast Plutonic Complex. Gold associated with pyrite occurs in quartz-ankerite-sericite- sulphide veins within the shear zone.
The Summit showing is located in the southern end of the north- south trending shear system, about 3400 metres south of the Surf Inlet Mine (103H 027). A narrow northeast trending quartz vein occurs along the contact between diorite and quartz-feldspar-biotite- hornblende gneiss. The contact zone is altered with chlorite, seri- cite, ankerite and quartz. A 90 centimetre sample across the quartz vein assayed 6.67 grams per tonne gold, 14.5 grams per tonne silver, 0.015 per cent copper and 0.0015 per cent tellurium (Assessment Report 15377).