Geophysics, page-3

Thanks @afawcett. My concern is that the mineralisation seen in the drilling done to date is from the Oak Dam deposit and not from a IOCG within the CHK tenement. From 'Geophysical vectors to IOCG mineralisation in the Gawler Craton':


The only economic IOCG deposits discovered to date in the
Gawler Craton have an association with hematite; as a result
gravity is the premier discovery tool. Olympic Dam was
discovered while testing a gravity and magnetic anomaly
considered as a basement high in regional data (Esdale et al.,
2003). Prominent Hill was discovered by the drilling a gravity
high with an offset magnetic anomaly, to test the model of a
higher level hematite system with a transition to magnetite at
depth (H Freeman, pers. comm.).

https://www.tandfonline.com/doi/pdf/10.1071/ASEG2013ab242