Sounds like the best option, is to do more learning on your own.We have a saying "if you want it done right, do it yourself". The web is a great source of info. Stay away from most Youtube people. I have found many state of the art papers on all aspects of mining, milling, smelting, and refining on line.
Why are you using Iron for collector metal?
I have been in this industry for over 50 years. This forum has been an ever learning community, where information has been shared openly, honestly, accurately, and FREE. If somebody can help, they will. I have never seen any body hold back any "secretive " processes, for there really are none.