>>61092510
My process is for gold with about 50% silver contamination

I part with copper pipe under MAPP gas
Then I hit with nitric to recover gold and put copper and silver into solution
I then dilute nitric 50%
then add copper pipe to recover cement silver
Then decant copper nitrate to recover copper later with iron rod
Finally I neutralize nitric and dump it down the drain.

So far I've got about an ounce of gold and another close to an ounce of silver at the cost of a liter of nitric and about a pound of copper, which I will recover.