The region is underlain mainly by the Paleozoic to Tertiary Coast Plutonic Complex consisting predominantly of crystalline rocks which exhibit a variety of fabrics ranging from pre-to post- kinematic. Paragneisses of (?)Paleozoic age, younger deformed metasediments and volcanics related to the Stikinia Terrane are interspersed within the plutonic complex. The northeastern part of the Bella Coola map area is underlain primarily by mafic volcanic and sedimentary rocks of the Jurassic Hazelton Group. These rocks are variably deformed containing both northeast and northwest trending structures.

Between the Hazelton Group of the Stikinia Terrane to the east and the Coast Plutonic Complex with its deformed metasedimentary terrane to the west, is a belt of dominantly mafic rocks, probably of volcanic origin which may be part of the Hazelton Group.

The Sure Copper showing consists of copper mineralization reported to be associated with shearing in a deformed hornblende diorite-granodiorite stock which has intruded metavolcanic rocks, probably related to the Stikinia Terrane.