The Tyaughton mercury showing is located on the north side of Tyaughton Creek immediately above its confluence with Lisa Creek (NTS Map 92J/15). Shale (probably argillite) of the Mississippian to Jurassic Bridge River Complex (Group) is exposed in the creek bank over an area of about three square metres. This outcrop contains about 1.5 per cent mercury as cinnabar while in an adjacent outcrop small specimens of crystalline cinnabar are found.