Chalcopyrite and pyrrhotite were observed within a kilometre of the western shore of Bute Inlet (Geological Survey of Canada Open File 480). The area is underlain by diorite of the Late Jurassic to Eocene Coast Plutonic Complex.
A northwest trending belt of Paleozoic and/or Triassic meta- morphic rocks occurs to the immediate north. These consist primarily of amphibolite, schist and quartzite.