Ores were formed by sulphur-rich mineralising fluids carrying copper, zinc, lead, silver and iron exhaling onto the sea-floor surface, where sulfide minerals were deposited as sheets of massive sulphide mineralisation up to 7 m thick, made up of sphalerite, galena, chalcopyrite and pyrite.
Whim Creek is hosted within the Rushall Slate, which is a finer-grained equivalent to the Cistern Formation.