Chemical Sodium Hydroxide -vs- SMB to Precipitate Gold

[anachronism]

I somewhat agree that these posts are unprofessional. I have 70,000 SIM cards I had XRF tested to type 1SIM 8.9 AU% and type2 4,4% AU content, Ni & CU being the Main elements tested.
AU content and base metals should be determined first and yields via processing then examined for maximum effective refinement.
All acids used should be content listed to avoid confusion.
The references to Hock's outdated book quoting 50c utensils should've been rewritten by any true Gold enthusiast on this site.
I don't intend at all to criticize this site & appreciate the dedication by the members, but am finding it also unhelpful. I would've gladly paid for proper advice but now believe I have to try elsewhere.

Jerry

Don't expect those yields from the sim cards by weight.

Jon