The Stewart uranium-thorium occurrence lies about 33 kilometres northeast of Stewart, about 7.5 kilometres east of the Bear River Pass and along the Stewart highway (37A).

The Tertiary(?) Strohn Creek porphyritic quartz monzonite pluton cuts Middle-Upper Jurassic Hazelton Group sediments. The pluton contains radioactive coarse quartz-feldspar muscovite-biotite pegmatitic phases containing pyrite, uraninite and cyrtolite. A selected sample assayed 0.0988 per cent uranium and 0.02 per cent thorium (Geological Survey of Canada Paper 79-1A).

The area has been explored since about 1917, when an adjacent area was staked over the Fitzgerald molybdenum showing (104A 025) located 700 metres to the east. The occurrence was discovered in 1978 during a car-borne scintillometer survey along the highway. During 2005 through 2010, Auramex completed programs of prospecting, geological mapping, geochemical sampling and airborne geophysical surveys on the area as the Bear River-Surprise Creek property.