The Northern Lights polymetallic vein is located in the Taylor Creek Basin, 2.5 kilometres south-southwest of Eldorado Mountain. The prospect is within massive to sheared serpentinite and serpentinzed peridotite, intruded by dykes and irregular bodies of Paleocene Eldorado granodiorite. This serpentinite melange, which may comprise an offset portion of the Permian and older Shulap Ultramafic Complex, is in fault contact to the east, west and south with rocks of the Mississippian to Jurassic Bridge River Complex (Open File 1989-4; Fieldwork 1988, page 119).

Quartz veinlets, generally within the granodiorite, contain arsenopyrite and pyrite; these are narrow, discontinuous and are partly decomposed. The No. 2 adit, 87 metres long, explores these veins below surface. Samples from the pit in 1935 were reported to assay 10.3 grams per tonne gold and trace silver (Minister of Mines Annual Report 1935, page F16).