I thought viewers of the Forum might be interested in an introduction to a geophysical method that has not yet come under discussion.
Early prospectors learned that mineralization in the earth would conduct electricity. Methods were developed to simply drive metal stakes into the ground and apply voltage - generally using a battery. Resistivity methods were developed and are still in use today. Other methods measured induced polarization and those are also still in use today.
One method that is seldom mentioned is "Mise a la masse".
An explanation can be found here:
https://www.wellog.com/mise_a_la_masse.htm
This simple, low-cost method allows prospectors to chase the direction and extent of mineralization in the earth from a mineralized outcropping! We need all of the tools we can get in order to locate and determine the dimensions of GOLD deposits and other valuable mineral deposits.
The "system" uses the DPDT switching method mentioned elsewhere on the Forum. Two metal stakes transmit a current into the earth. Two metal electrodes measure the voltage at selected locations in the vicinity of the outcropping. The electrodes are preferably the non-polarized type used in the cathodic protection industry.
https://www.tinker-rasor.com/portable
These electrodes are connected to a digital voltmeter or an oscilloscope to measure the response and calculate Resistivity and IP.
Stick around! There's more!
- Geowizard