I don't know how well this wil work, but maybe check for the direction of the fundamental ray before digging.
Nickel (some meteorites) S.E.
Silver E.
Aluminum N.E.
Copper S.W.
Lead N.W.
Carbon (coal, graphite, diamonds) S.W.
Iron, Steel S.
Gold W. normally, N. sometimes, E. rarely
Cavities N.W.
So the idea would be to locate a silver suspected target and circle the area looking for a fundamental ray. If it matches what you are searching for, check it out.
Nickel (some meteorites) S.E.
Silver E.
Aluminum N.E.
Copper S.W.
Lead N.W.
Carbon (coal, graphite, diamonds) S.W.
Iron, Steel S.
Gold W. normally, N. sometimes, E. rarely
Cavities N.W.
So the idea would be to locate a silver suspected target and circle the area looking for a fundamental ray. If it matches what you are searching for, check it out.

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