The Bunsby copper occurrence is located on Bunsby Island near Upsowis Point.

The area is underlain by sediments and volcanics of the Lower Jurassic Bonanza Group, comprised of a lower sequence of calcareous sediments overlain by intermediate flows and intermediate to felsic pyroclastics. Small wedges of Upper Triassic Vancouver Group calcareous sediments of the Parson Bay Formation are in fault contact with the younger Bonanza Group rocks. Granodioritic intrusive rocks of the Early to Middle Jurassic Island Plutonic Suite are exposed to the west.

Locally, a shear zone in basaltic rocks hosts lenses of copper (chalcopyrite?) mineralization. A sample assayed 1.3 per cent copper over 2.25 metres (Property File - A.E. Aho [1960-06-17] - Sketch Plan of Bunsby Island Copper Showing).

In 1960, the area was prospected by A.E. Aho.