Of course I’m trawling the forum from A to Z (Thanks for rescuing me there @YggdrasilIt could be trawling the threads
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, it sometimes becomes difficult to nuance and understand when the translator interprets a text in a completely different way than it was originally intended. , the question was whether I save the copper crumbs that remain in the stock pot?
It's challenging to recover gold from electronics, and it seems like you're on the right track. However, the lack of a precipitate could be due to low gold concentrations or incomplete reduction.
Per the bold print:
You do not neutralize aqua regia before using sodium metabisulfite. You deNOX the solution, meaning you eliminate any excess nitric acid and nitrates. Sodium metabisulfite needs HCl in the solution to work.
I use sulphamic acid to kill nitric and ferrous sulfate to precipitate gold. ty for the input.
Thank you all for the advice, comments and warnings. I am a beginning gold refiner, not a beginning chemist. I had my first Gilbert Chemistry set in 1969. While studying nuclear engineering at university I took two semesters of chemistry, also materials engineering and nuclear materials. I provided oversight at three nuclear fuel facilities in the USA. There, in highly secure controlled ventilation areas you encounter virtually every chemical or compound you can imagine from uranium dioxide, uranyl nitrate, uranium hexafluoride, etc. I love all forms of chemistry. And, I love gold and gem mining.
This post was not directed at you.Thank you all for the advice, comments and warnings. I am a beginning gold refiner, not a beginning chemist. I had my first Gilbert Chemistry set in 1969. While studying nuclear engineering at university I took two semesters of chemistry, also materials engineering and nuclear materials. I provided oversight at three nuclear fuel facilities in the USA. There, in highly secure controlled ventilation areas you encounter virtually every chemical or compound you can imagine from uranium dioxide, uranyl nitrate, uranium hexafluoride, etc. I love all forms of chemistry. And, I love gold and gem mining.
Sodium borohydride is very interesting reagent. It is very effective, strong reducing agent, but on the other side, very unforgiving and violent chemical
If you do not exactly know what you are doing.
After cool down, there was visible gold through out the product. The material seemed more like hard graphite with gold throughout instead of metal. I washed it with dilute sulphuric. That step produced no noticeable change. I was obviously disappointed, So I crushed the material back to a fine powder with my mortar and pestal. Apparently about half of what I began with was incinerated in the process. I have more gold bearing material to add, if need be. This effort was a trial with a relatively small amount of precipitated and dried gold material. What should I do to make the gold content coalesce and form a bb or button? Thank you in advance for your help and advice. 
If you have pure Gold no flux is needed.Very frustrating final step setback last nite. I had gold powder. I had a glazed crucible, a MAPP gas torch, borax flux and sodium carbonate. I managed to melt the material to a red hot liquid form. But, whenever I’d sprinkle the sodium carbonate, the gold would not coalesce into a bb or button.
Try putting some insulation under the melt dish, or preheat crucible to red before putting in powders. Or as Kurtak suggested in another thread, put the melt dish on a camp stove to heat from underneath, as well as the torch.
No flux or sodium carbonate sprinkle needed if you wash the gold proprely. Just a brand new borax sprinkle glazed crucible and a clean torch.
“How well did you chill, dilute and filter the solution before precipitation?“ I thought I filtered pretty well. But I could’ve used ice and washed/diluted more. Thank you very much for any and all advice.
When you wash the powder with hot HCl, any silver chloride will give a yellow color to the solution. Rinse and repeat until a wash stays clear.“How well did you chill, dilute and filter the solution before precipitation?“ I thought I filtered pretty well. But I could’ve used ice and washed/diluted more. Thank you very much for any and all advice.
One tidbit of advice. Get the tin out in a separate operation. It poisons the later gold drop, or reduces whatever gold chlorides are formed as fast as they form. Lots of ways to go about it. I prefer a hcl dip tank so I can electrowin it back at a later time.
