The area of the Vega showing is underlain by Devonian to Upper Triassic metasediments intruded by granitic rocks of the Oligocene Tkope River Intrusions. A test pit on the north slope of Copper Butte, southwest of a pond at the head of a west-flowing tributary of Inspector Creek, exposes pyrite, sphalerite, chalcopyrite, and bornite in serpentine skarn. A sample assayed 144 grams per tonne silver, 2.72 per cent copper, and trace gold.