The Sixmile occurrence is located 7 kilometres north-northwest of Stewart on the east side of Salmon River and the road, at the base of Mountain View.

The area is underlain by the Early Jurassic Texas Creek Plutonic Suite consisting of granodiorite. Narrow quartz stringers and veins are hosted in shear zones up to 1.5 metres wide. Visible native gold occurs within the borders of the quartz stringers and in the granodiorite wallrock. Some of the stringers carry galena with flakes of gold within the galena. Minor pyrite is disseminated in the granodiorite and where quartz veins occur the shattered wallrock is impregnated with pyrite and galena along fractures.

At the Sixmile showing, two adits were driven in 1925 along shear zones. The southern adit, 10 metres long, is along a quartz vein striking 310 degrees and dipping 70 degrees northeast. The vein is a fraction of a centimetre wide at the portal and widens to 15 centimetres in the adit. A shattered zone at the face of the adit contains quartz stringers mineralized with galena, pyrite, chalcopyrite and native gold.

A second adit, 4.5 metres to the north of the first and 10 metres long, follows a shear zone 1.5 metres wide containing narrow quartz stringers. The main quartz vein, 2.5 to 20 centimetres wide, is mineralized with galena, pyrite, chalcopyrite and sparse sphalerite.

An opencut in a bed of a gulch exposes a shear zone 38 to 50 centimetres wide with quartz stringers mineralized with pyrite and galena. The vein strikes 318 degrees and dips steeply northeast. A heavy pyritic quartz stringer assayed 2.05 grams per tonne gold and 20.56 grams per tonne silver; where galena occurs an assay returned 23.31 grams per tonne gold, 287.95 grams per tonne silver and 8.7 per cent lead (United States Geological Survey Bulletin 807).