Sometimes some, but very little. If there is, it is usually on the contacts (fingers) where the board plugs into a socket. It would be only a very thin flash coating on very limited areas. Not enough for YOU to do anything with. I have heard that tons of old boards are shipped to China or some other third-world places to be mass processed for recovery, but not sure of that or the economics.
There is very little gold on the contacts where the board plugs in. However, if the board was inserted and removed a lot, not even that is there. Not worth the effort because the gold is industrial grade and low value to begin with.
Gold is a very good conductor; nice USB cords, flash drives, audio cords, and other connectors that process large amounts of "data" can be gold COATED. The units themselves are worth more than the gold is, so most times it's not even worth the effort, even if you're just scrapping and old comp, and trying to sell your processor to Cash4Gold.