As a person holding an Extra Amateur license, I have had a lifetime
of experience playing with electronics and circuitry.
It used to be, about a generation ago, that you could scrape the gold
off circuit board fingers with a razor blade. But not so any longer.
True, refining or recycling precious materials from used electronics
is a worthwhile salvage activity, but only to those with sufficient
economies of scale.
You could recover about one ounce of gold per ten tons of electronic
material. There’s better things to be doing with your time.
Andrew Jonathan Fine