Thanks for the info, I appreciate it.
I ended up picking up a used copy of E. M. Wise "Gold, recovery, properties and applications" from someone who picked up a bunch of old, used books from the University of Michigan, I was hoping to find another book that way, the price I paid was fair, and the book is in very good condition, certainly readable. Maybe you would know this, are there copies of Ammen's book in hardback? I have only seen soft, and paper backs.
There was someone on eBay selling their entire lot of gold refining equipment, I emailed him a few times about buying just the books, but he was having none of it. He did say he had all three I was looking for, and many more. I would really like to find someone like that who is retiring, or moving into a different hobby, who would be willing to sell their library of recover, refining and process books all together. I think that's a pipe dream though.
Thanks for the information and the link, and setting me straight on the author of that particular book. It looks interesting, I'm really curious what it actually reads, but I don't read German, so it's a complete loss for me.
At the heart of science is an essential balance between two seemingly contradictory attitudes--an openness to new ideas, no matter how bizarre or counterintuitive they may be, and the most ruthless skeptical scrutiny of all ideas, old and new. This is how deep truths are winnowed from deep nonsense. -- Carl Sagan
"When I get a little money I buy books; and if any is left I buy food and clothes". Erasmus (1467-1536))