The Duf (Hurley Vein) occurrence is located on the north side of a cirque, approximately 2.5 kilometres north west of the north eastern end of Duffey Lake.

The area occurs in the south western part of a large, elongate roof pendant formed from rock of the Bridge River Complex and the Cadwallader Group. Mississippian to Jurassic Bridge River volcanic rocks are in fault contact with volcanic rocks of the Upper Triassic Cadwallader Group. Rocks of both groups strike to the northwest, dip to the northeast and are overturned with tops facing west. Intruding these rocks is a felsic dike.

The Hurley vein is a fissure-controlled quartz vein up to 1 metre wide with disseminated tetrahedrite mineralization. The vein, which strikes at 117 degrees and dips at 44 degrees to the south, has been exposed over a distance of 10 metres in an adit. Other quartz veins located in the area are barren of silver mineralization.

A bulk sample of vein material, collected in 1987, assayed 716.6 grams per tonne silver and 1.0 per cent copper (Assessment Report 18808).

A short adit is reported to have been driven on the vein in the early 1900’s. In the 1960’s, programs of stripping and road construction were completed. During 1981 through 1984, Bondell Resources prospected and soil sampled the area immediately north east as the Moon claim. In 1989, the area was prospected and mapped as the Duf claims.