The Northern Lights 6 polymetallic vein prospect is in the Taylor Creek Basin, 2.5 kilometres southwest of Eldorado Mountain. The prospect is within an apophyses of the Paleocene Eldorado quartz diorite. These rocks intrude chert and quartzite of the Mississip- pian to Jurassic Bridge River Complex (Group), (tectonically imbricated with serpentinite of an unassigned affinity) and sandstone and conglomerate of the Upper Triassic Cadwallader Group (Hurley Formation).

Fractures and shears that cut the quartz diorite, strike northeast and dip steeply, and localize veins (generally narrow, but up to 25 cm thick) of quartz and arsenopyrite, pyrite and sphalerite, with minor chalcopyrite. The surrounding sheared quartz diorite also contains disseminated sulphides. The veins are commonly banded with respect to the distribution of sulphides and quartz.

The "No. 1 adit", 126 metres long, explored these veins. The original workings on surface (65 metres west of the adit) expose a vein 25 to 30 centimetres thick. A 2.1-tonne bulk sample was taken in 1934 and graded 59.66 grams per tonne gold, 2.06 grams per tonne silver 0.05 per cent copper, 19.56 per cent arsenic, 13.9 per cent iron, 44 per cent silica, 5.9 per cent alumina and 6 per cent sulphur (Ministry of Mines Annual Report 1935, page F14).