That's a good question for someone from GeoTech to answer or someone whos is more familiar with the technology. I don't think the technology has been around long enough to know exactly how accurate their surveys are.
If you look at their website, one of the key features of ZTEM is: Excellent resistivity discrimination and detection of weak anomalies due to the nature of the natural EM fields.
For now we have to rely on geophysical and geochemical surveys and knowledge of caldera formations. The big players use drill results, not a technology like ZTEM to decide whether or not they want to get involved. Thats why we still sit at .03x. It is a blessing that Hunter Dickinson is involved and covering the cost going forward. Drilling is the next step. ZTEM will also help identify specific targets and reduce the cost of further exploration. The fact that HDI is apparently sold on the technology should be an additional confidence boost albeit not the definitive data you're looking for.
So yes, the correct answer at this point should be: "Looks good; now let's drill it and see." ... the good news is that simply announcing a drilling plan should give us a boost in anticipation of results. Play accordingly.