Hi Max,
It appears to me the reason you can't imagine a method of locating buried metal from a long distance is partly because your source of information is not good. It appears you are relying on commonly believed ideas rather than looking at the research that shows what is really observed and known.
For an example, suppose I said I can locate Carl's 10 ounce gold bar buried 2 inches deep in soil using only an instrument that measures the existing magnetic field. Suppose I said I could locate this gold bar buried in one of ten locations spaced 10 feet apart from each other, in an area of land that I choose within 10 miles of where Carl lives. If I conducted a magnetic survey over the soil where the gold might be buried using only an instrument to measure the existing magnetic field, and not allowing the magnetometer to actually touch the soil, do you believe I cannot find the gold bar?
Here are my 3 questions for you:
1. Do you believe I could find Carl's 10 ounce gold bar with this magnetic field instrument on the first try?
2. Do you believe I could find Carl's 10 ounce gold bar with this magnetic field instrument 7 times out of 10?
3. Do you think Carl would allow me to keep the 10 ounce gold bar if I was able to locate it with this magnetic field instrument 7 times out of 10?
(Hint: No way! Carl is too smart to let me use a magnetometer to locate his gold bar and win any prize from him)
Best wishes,
J_P
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