I mean it is pretty easy to sell gold, especially if you sell it below spot price or melt it. If someone offered me gold at a 10% discount, I would immediately buy it and go sell it at whatever gold dealer for an easy profit. Im sure most gold dealers would do the same thing even if it was obviously stolen spanish gold or something.

If you wanted some sort of legal paper trail to fall back on you can spend a bit of money on a few machines and rights to a gold claim in Alaska, dig some random holes for a few months, then claim you struck it rich.