Induced Polarization when it is used in mining is designed to specifically identify porphyry copper deposits. 

Induced polarization (IP) works by passing an electrical charge into the ground to measure how local conditions impact it. The disseminated sulphide minerals that make up a bulk tonnage deposit will carry the charge and are therefore be represented by a high “chargeability” response. 

A second measure known as “resistivity” can locate faulting or similar features with a low response. A high resistivity response may indicate a section of rock that had been flooded metal bearing fluids and plugged and plugged by resistant silica. This type of anomaly can be targeted for gold deposits.