The Hellyer deposit, hosted in the Cambrian Mt Read Volcanics, displays features typical of volcanogenic massive sulphide orebodies. These include a well developed stringer zone, metal zonation within the orebody, a polymict volcaniclastic sequence flanking the deposit and a hangingwall alteration plume in overlying basaltic pillow laves._x000D_
Mapping and core logging is very detailed in order to extract as much data as possible from the deposit and its host rocks. A geological log suitable for direct computer input was adopted shortly after the deposit's discovery.