The Sedex 3 occurrence is located about 4 kilometres southwest of Hanna Ridge, 47 kilometres northeast of Stewart.

The showing is underlain by a succession of sandstone, siltstone and rare conglomerate of the Middle-Upper Jurassic Bowser Lake Group (Ritchie-Alger assemblage). A rock sample (349941) from sub-outcrop of vein rubble comprising 50 per cent quartz and 50 per cent fine grained clastic rock fragments yielded 2.09 grams per tonne gold (Assessment Report 28589). Quartz veins in the area averaged 10-40 centimetres in width and occur within small extensional fractures.

A rock sample (349842) taken from a cirque at the headwaters of a northeasterly flowing stream about 1200 metres west of sample 349941, yielded 0.6 gram per tonne gold (Assessment Report 28589). The sample was taken from 1-3 centimetre wide quartz-carbonate stringers occurring in a layered wacke.

In 2006, a preliminary geochemical sampling program on the AA and Sedex property was conducted by Amarc Resources Ltd. A total of 79 silt, 39 moss mat and 39 rock samples were taken.