I have a copy of Gajda's book and I agree it is not the best written. It is also slanted to cyanide leaching of e-scrap. The book did have some worthwhile information. There are chapters on the identification of binary alloys,
another on the commercial separation of precious metals, another on the refining of platinum group metals, another on electrolytic refining methods,
and finally a chapter on precious metal alloys. This is good information -- unfortunately the rest of the book can easily be discarded as useless, badly written, and redundant.
Randy in Gunnison