Well, anything here in my reply is my opinion. Some may agree, some may disagree, but here it is.
I believe what he is trying to say is that the easy gold at surface has been found.You may see a vein at the surface untouched because there is no visible gold in it, but that doesn,t mean there isn,t any there or that there is any at depth. He may be also talking about the area of Argentina he is in. I heard someone say that Peru is only about 15% explored yet, so the chances for finding visible gold in veins at surface is great.
The geophysics reveal structure, which can be faults,dykes,shear zones, etc. They also reveal magnetics,resitivity and induced polarization which helps read the ground, or in other words, like an xray of the ground. There are many lineaments on the property representing faults and fractures that may carry gold. Our most prominant area with the colliding faults, is where the anomaly is located. Lori does describe "blowouts" in historic literature on the property, and how these mineralized blowouts can be associated with faults.
We know where the faults are and checking these structures as well as other structures. You have to remember that many different or all, structures may carry gold on the Tesoro. Some of these may be veins, faults, pegmatites, dykes, breccia,s etc.
Just my interpretation.
IMO