The area is underlain by metasediments consisting mainly of schists intruded by biotite quartz monzonite.

GSC map 278A (1933) plots a copper showing on the west shoreline of Douglas Channel, midway between Kiskosh Inlet and Kitkiata Inlet. This map also indicates that the showing is associated with schistose rocks. Since the only other rock type exposed along this shoreline is granodiorite of the Ecstall pluton, the showing is likely hosted by the heterolithic “quartzite” unit of Gareau (1997). The location for this showing is thus two kilometres north of the mouth of Kiskosh Inlet; that is, 2.5 kilometres south of the location shown on Gareau (1997).