Two examples of electrical resistivity tomography rainbow plots. The blues represent conductive areas while the reds and yellows represent resistive areas. hydroGEOPHYSICS Inc.

Stacking methods, soil properties, and hydrologic flow anomalies create under-leached areas by constraining leachate flow during the traditional leaching process. These underleached regions of the subsurface pad will be dryer than more saturated areas. These dry areas are potential regions of high precious metal content.