Muller has mapped the area of Foley Peak as being underlain by three metamorphic assemblages of Mesozoic and/or Paleozoic rocks, metamorphosed in the Cretaceous, all in fault contact (GSC Map 41-1989). These include the Custer Gneiss, the Settler Schist (in part) and the Slollicum Schist. Muller maps a fourth unit of ultramafic rock, of similar age. A few kilometres to the north of the Lucky Four prospect is the contact with the Miocene Mount Barr batholith consisting of granodiorite. Intrusive rock of the Oligocene Chilliwack batholith occurs within several kilometres to the south. Hostrocks are reported to be greywacke, argillite, schist and gneiss.

The East showing is a skarn zone 4.6 metres wide with an exposed horizontal length of 46 metres. Northwestward it splits into narrow stringers and disappears in gneissic banding; to the southeast it is drift covered. One body of massive chalcopyrite, about 28 square metres, occurs in this zone. The East showing occurs less than 15 metres from an intrusion of granodiorite. See the Lucky Four prospect (092HSW007) for further details.