The A-35-E native sulphur showing is located 235 kilometres north of Fort St. John and 140 kilometres east-southeast of Fort Nelson. It is located near the Kahntah 3 First Nations Reserve, approximately 4 kilometres southwest of Hay River.

The A-35-E showing is situated on dominantly Cretaceous continental and marine affinity rocks of the Fort St. John Group, which consists of mudstones, siltstones, shales and other fine clastic sedimentary rocks.

Native sulphur was intersected in well A-35-E 94I/8, an exploratory hole drilled for hydrocarbons. This well was drilled through a succession of evaporites, reefal carbonates and thin beds of clastic rocks of the Middle Devonian Elk Point Group. Two sulphur-bearing sections were intersected in the upper member of the Upper Keg River Formation. An interval at 2138.2 to 2141.5 metres depth contained a 1-metre section grading 30 per cent sulphur followed by a 9-metre interval of dolomite and anhydrite interbeds with a heavy sulphurous odour and possible native sulphur. A second interval at 2167.1 to 2173.2 metres depth comprised dolomite and possible thin sulphur-bearing beds. The native sulphur is yellow, coarsely crystalline to amorphous and burns out of the samples as sulphur dioxide.