The region is underlain by Paleozoic rocks of the Cache Creek Group, largely covered by a veneer of Miocene basalt. A window in this basalt has exposed a small (?)Mesozoic granodiorite stock which may be similar to the Lower Jurassic Granite Mountain Pluton to the north of Williams Lake.

The EM showing is underlain by this granodiorite which has been traced over a distance of about 3.2 kilometres in a north-south direction. Sporadic disseminated chalcopyrite and bornite occur within the stock along with fairly pervasive chloritic and sericitic alteration and lesser potassic alteration.