I have done a bit of gold recovery from
ewaste. I have gold powder, but not gold metal. About 1 cc of brown powder for months of work & 5 gallons of HCL & 400mls H2O2 & 150gms SMB.
It takes days & days of work, weeks if not months.
For me full weeks of mindnumbing work. Every tiny sort of ewaste item has to be processed in a different way. Every sort of CPU has to be seperated & then processed according to its makeup.
Every sort of board has to be processed in its own way depending on whats on it & whats its made of & what you are getting off it.
You need a lot of ewaste to make getting the gold worthwhile, hundreds if not thousands of computers, all pre 2000...
Theres been several time I could have maimed myself with acids, sliced myself, ruined my kitchen work area & rusted everything in sight & a bunch of times I could have lost all my gold too.
It'd be easyer to get 100 computers & scrap them down & sell them.
In NZ I have got 60 computers over the last year, theres just not that many here.
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