The conclusion to that article is probably a reasonable...

The conclusion to that article is probably a reasonable assumption to take with IOCG deposits. While it can give targets to consider it does not define. Ultimately is the drill that is the final determinant. To wit:

Geophysics is the primary exploration tool for IOCG exploration in the Gawler Craton due to the widespread cover over the prospective rocks. Gravity, magnetics and seismic are vectors at the terrane scale. Interpreting geology, mapping the basement topography, gravity highs +/- associated offset magnetic responses, chargeability highs and resistivity lows are vectors at the tenement scale. Though at the deposit scale these techniques fail to directly detect, or provide vectors to mineralisation within an IOCG deposit.