Problems in platinum recovery

[Yggdrasil]

What is the point of waiting for smb gases if you are going to precipitate it with copper anyway?
As long as you use good PPE

The SMB will drop most if not all the Gold.
It will however still contain minute amounts of Gold and most of the PGMs.
This will be cemented out with Copper.
This will be processed later.
I have not heard that the SO₂ could cause trouble though.