Which is the best signal to detect for long-time buried gold?

[J_Player]

What is the best signal to try to detect for locating long-time buried gold?
I am asking this question to be answered by people who claim to be successful when using an LRL to recover treasure. Not from skeptics who do not believe there is a signal to be detected.

According to Esteban, there are many secondary effects which are part of a peculiar phenomenon that accompanies long-time buried metal objects in the soil. He has listed many of these effects, such as electrostatic, magnetic, resistivity, etc.

The question is "which effect of this phenomenon do you consider to be the most reliable and best to detect in your search to locate the buried metal object"? Also, what kind of machine do you use to detect this signal you are looking for?

If you wish, you may qualify your answers by stating that a certain effect is only good for certain conditions, or that certain effects are better suited for other metals than gold, etc.

Best wishes,
J_P