Sorry again, but it is very complicated. One can measure the magnetic susceptibility of individual minerals and their corresponding conductivities in a lab environment. Then one can calculate the same based on their concentrations when combined with other minerals. Then one has to take into consideration the depth to surface. Then one has to consider the line spacing of the surveys. Interpretation of actual geophysical responses from airborne or ground surveys is truly part science and part luck. Hopefully, both are working at the same time to your advantage.

geoprof