The area of the Wren occurrence is underlain by intrusive rocks assigned to the Cretaceous Spuzzum pluton which has intruded Cretaceous to Tertiary metasedimentary rocks of the Settler Schist to the west. The intrusive rocks host numerous coarse-grained pegmatite veins with prominent biotite books and local quartz stringers and have been cut by late dykes and plugs.

The Wren showing comprises a quartz vein, up to 2 metres wide (average 1.35 metres), striking 260 degrees and dipping from 80 to 85 degrees north within granite. The vein, which is paralleled to the south by a fine-grained dyke, is exposed for approximately 160 metres near a steep headwall and hosts local pyrite and arsenopyrite, with associated low grade gold values. The best assay from eight samples across the vein graded 0.9257 gram per tonne gold and 2.74 grams per tonne silver across 65 centimetres (Assessment Report 9701).