pontif

I happened to watch a video on gold extraction and refinement. I know the same can be done with Silver and Gold filled items. I am a jeweler (actually disabled - hit head on by an 18 wheeler and wrecked my back years ago). I have POUNDS UPON POUNDS - about 12+ pounds total in all - OF scrap sterling and silver wire, and more than 4+ pounds of 1/20 14kt gold wire scrap. Is there a timely manner and a method that makes $$ sense to refine the precious metals into fine silver and 22kt+ gold. I have read one article that mentioned using Nitric acid. Any ideas from the real chemists? Thanks for helping the new guy! Stuff I make below! Always wanting to show off. Sorry! William