Yes I looked at that as well. Geophysical methods measure...

Yes I looked at that as well. Geophysical methods measure constrasts rather than absolutes, so maybe the EM response between the ridges and surrounding rock is similar. DEVex said their disseminated sulphides didn't show up on EM.

The rock chips don't negate the lack of EM response, and the lack EM response doesn't negate the rock chips. Its all a matter of how you interpret it and its a target for more work because of the rock chip results, even if its just mapping and more chips. Its the difference between boots in the helicopter and boots on the ground.