The Brownie occurrence is located near the headwaters of a creek approximately 7 kilometres southwest of Yehiniko Lake and 23 kilometres east of the Stikine River.

The showing is hosted in dark green to grey, variably feldspar porphyritic andesitic flows which are overlain by green volcanic greywacke. Fossils identified as Upper Triassic were found just north of the showing (Geological Survey of Canada Paper 71-44) and provide a correlation of the volcano/stratigraphic sequence with the Upper Triassic Stuhini Group. Regional bedding strikes north to northwest and dips moderately west to southwest.

Mineralization consists of disseminated to blebs to semi-massive pyrite, sphalerite, galena and minor chalcopyrite hosted within a 15 centimetre wide quartz-iron carbonate vein. The vein strikes 020 degrees and dips 65 degrees to the southeast. A grab sample from the vein returned values of 0.45 grams per tonne gold, 20 grams per tonne silver, 0.045 per cent copper, 0.58 per cent lead, and 3.5 per cent per zinc (Open File 1989-7).