I heard a story about a couple in California who liked to go camping in the Sierras and he liked to poke around with his metal detector.
He comes back to camp after about four hours and decides to take a nap, she had never used the detector but goes off with it anyway.
Comes back a while later and says she didn’t find any gold but there was a rock “over there” that was making weird noises...
He takes a hike over, big chuck of quartz there, when they finally get it dug out, broken open and cleaned up they had more that seven ounces of museum quality crystalline gold specimens.
And good quality pieces like that are usually worth AT LEAST five times more than spot!!
I know a guy who goes and hunts in old mine dumps. He finds some pretty nice specimens that the old timers missed.