Quartz diorite of the Mesozoic and/or Paleozoic Westcoast Complex is intruded by apophyses of quartz monzonite, possibly of the Early to Middle Jurassic Island Plutonic Suite. The diorite outcrops are characterized by an abundance of metavolcanic and metasedimentary xenoliths. Discrete blocks of garnetite and epidote-garnet-diopside skarn occur within the intrusive rock and form the knob on which the mineralization occurs.

The Ebb 1-12 showing consists of a 1 to 2 metre wide sheeted zone containing massive pyrite, pyrrhotite and lesser amounts of sphalerite and chalcopyrite. It strikes northwest and dips 50 degrees southwest. One pit sample assayed 0.69 grams per tonne gold, 0.01 per cent copper and 0.06 per cent zinc across 2 metres; another pit sample, also taken across 2 metres assayed 1.92 per cent copper, and 13.71 grams per tonne silver (Geology and Exploration in British Columbia 1972, page 258).