So why not fly over a number of sections of land to the North east of the San Antonio eg. the 11 hinge zones areas?

Since drilling hinge #4 has proven high grades at just 120 meters below surface a geo survey could give clues to where the core of this systems is. Perhaps Bill would like to find the core of this system the traditional way and same with Hugh and his drill rigs.

Just think back regarding SG1, all the drilling and development work they did. The time spent when they could have done airborne geo of a huge area and saved millions. There must be a good reason, I just don't know it.