The Hughes occurrence area is underlain by sedimentary strata of the Helikian Purcell Supergroup. On the property, buff weathering, pyritic, flaggy to shaly dolomitic sandstone, dark weathering, thinly bedded dolomitic sandstone, siltstone and quartzite comprise the Aldridge Formation. Creston Formation strata underlies the main part of the property, east of the Aldridge strata. These rocks consist of thinly intercalated ribbon quartzite, graphitic siltstone and fine-grained sandstone.

The Aldridge Formation rocks contain a large number of bull quartz and quartz-sulphide veins which occur through a 100 metre thick section, and are mainly parallel to local bedding. These veins comprise a relatively flat-lying en echelon stratabound swarm localized near the top of the Aldridge Formation below the overlying Creston Formation.

The quartz veins range from a few centimetres to several metres wide and are up to 100 metres long. A few of the veins contain coarse-grained argentiferous galena and pyrite. Selected grab samples of dump material from trenches assayed up to 1597.4 grams per tonne silver, 84 per cent lead and 0.68 grams per tonne gold (Assessment Report 16537).