The Bayshore showing occurs within the Upper Triassic to Lower Jurassic central Quesnel sedimentary and volcanic rock of south central British Columbia. These rocks comprise the northern extension of the Nicola Group. Felsic stocks of alkalic composition have intruded the volcanic rocks and are comagmatic with proximal felsic breccias of Lower Jurassic age.

The showing is located at the southeastern end of Bootjack Lake where syenodiorite of the Polley stock and nepheline syenite of the Bootjack stock outcrop. The Polley stock hosts the Cariboo Bell copper deposit (093A 008) on the flanks of Mt. Polley to the north. Small outcrops of Lower Jurassic felsic breccia and Upper Triassic maroon basalt also occur in the area.

Mineralization consists of disseminated chalcopyrite occurring within syenodiorite of the Polley stock and Lower Jurassic volcanic rocks. This mineralization was probably deposited during the same mineralizing event which formed the copper deposits of Cariboo Bell, a few kilometres to the north.