hey it seems no one around is familiar with the concept of "opportunity cost" !! it means that every opportunity, has a cost! so if you wanna dig a little gold out of your stuff, you will need to spend money on buying things like solvents. furthermore, time you spend there has a monetary value, summing it all up, I don't think gold extraction from your electronic junks will make sense, but for a Friday afternoon experience, it seems fun 😀