Here is a video some people may be interested in? A Russian guy makes gold nuggets using certain rock types, nitric acid, salt etc through clever chemistry.
Seems very time consuming but still rather cool. I guess if you considered it a hobby and did bigger batches then you could earn money from it.
Seems to be a lot of gold from a small rock sample. Maybe he's telling us something when he said this at the end: "Now I'm a Rich Pinocchio".
