There is very little gold or value in that circuit board.
Your health is much more valuable.
Do not try to recover or refine, or use any acids on metals or circuit boards unless you have a very good understanding of the dangers involved and know how to avoid them, and you have a safe environment to work in.
Without understanding the safety, you are not only losing your gold because you do not know what you are doing, but you will also be putting yourself and anyone around you in serious danger.