Cool! So was he walking funny? Was his hide baggy? Was there a name cut out in the gold? A diamond? Any rings in his ear, or bling around his neck? Maybe he killed and ate a rapper....
Take the jaw down to your local jeweler, and have him do a gold test on it. Just to test if it is gold, or not, and if so, to see what karat it is. Could be gold dust there, or could be like they said, fertilizer, or mineral, or you might have a gold mine.
either way, cool! Check to see if he has any gold Gall, or Kidney Stones
Wayne