A previously undated, unmapped plagioclase-biotite porphyry intrudes sediments of the Lower Cretaceous Skeena Group. The intrusion could possibly be related to the Eocene Nanika intrusions. The sedimentary package consists predominantly of greywacke, shale, conglomerate with minor coal.

The silicified quartz diorite to quartz monzonite hosts disseminated and fracture filling molybdenite, chalcopyrite, pyrite as pyritehedrons and arsenopyrite. A breccia zone is reported to host arsenopyrite, pyrite, and pyrrhotite. Both the medium-grained monzonite matrix and dark, angular fragments contain minor disseminated sulphides.

A grab sample taken in 1990 assayed 0.015 per cent copper, 0.0118 per cent nickel, and 0.0811 per cent arsenic (Open File 1991-1).