Here we see geophysics used in 1966, about 47 years ago, I wonder if it has advanced since then?

You may wish to note that it looks like they knew very well how to read them then,and that the higher chargeability represented mineralization, in this case sulphides. In comparrison to our case, we know we have sulphides and we know they correspond with the gold on the property, and we know the sulphides are responsible for the high chargeability seen in the C-1 area.

1966 - Geophysics Eastern Pau Skarn Trend

In 1966 the SGM (Mexican Geological Survey) conducted a geophysics survey over the eastern part of the Pau zone. This survey identified a large sulphide zone in the east of the Pau project characterized by high chargeability (Figure 9) and skarn mineralization characterized by high resistivity (Figure 10).

Figure 9 - Induced Polarization

Induced Polarization:
A chargeability anomaly (>14 sec), interpreted as sulfides disseminated in the intrusive.

South of California shaft: a high chargeability (14 msec) attribute to mineralization in skarn at the intrusive contact.

Southeast of the Burkel: high chargeability zone.

http://www.santafemetals.com/index.php?page=cuyoaco