I believe that when they put one of those probes down a hole that the can 'see' up to 200m in a 360 degree radius. It is more accurate nearer to the hole but none the less, it 'paints a picture' and tells them if they are on target and where to place the next drill. This is obviously a laymans way of expressing it but you can be sure that KXL and SGX have been using all those airborne, surface and underground gizmos to help them at the discovery stage of the project.

Best wishes,

Jerry Francis