Some of us have done business on the basis of recommendations the forum pros have made. It is hard to know who to trust and even who might be representing a company- under cover- as a forum member. We have done tens of thousands of $$$ in business based on some of these refinery recommendations. We always melt and assay well what is shipped, but somehow, hundreds of $$$ in Au seem to disappear mysteriously during refining. I wish there was a way to gain reliable information about the competency of an assayer/refiner and keep that updated. A company can start out being careful and honest and due to personnel changes, human error, spills, or any of the other factors, have their performance degrade. It is damaging to one's bottom line when picking a refinery based on old feedback and it is a heck of a lot easier to give positive feedback than to warn people.
The refiner has the last word. I've read a lot about being present with your gold ie. (not feasible if you are of state and ship under $20,000 at a time); doing your own fire assay and knowing what your ship (still does not prevent material from disappearing). I would suggest one thing that can prevent some potential disasters. When you ship scrap jewelry in ingot form and you know the amount of Au in it, have the refinery XRF your holes for a preliminary number, and then melt and give you a fire assay before anything else is done to the material. At least then if the discrepancy is large, you could possibly get your bar back. If you get talked into digesting it because "they can recover 100% of the gold and you will be totally happy with the result and we are totally honest and everyone loves us and we have grown from referrals, etc.", don't do it. You can deal with delightful and helpful salesmen but ultimately if anything happens they plead that they have checked everything and they don't even call you back as promised. More than half a Troy oz of Au disappearing is not even in the realm of normal incompetence, and when it happens a few times (not that much all at once you have to wonder what is going on). Obviously, regardless of the cause this is the cost of learning.
The lessons learned are those that the wise people in the forum have written about:
1. do fire assays
2. refine yourselves
We are evaluating 1 & 2 to prevent more problems. Although, we do very precise XRF analysis and use well calibrated standards, and for the life of me I can't see how a fire assay will make ANY difference when shipping bars of about 12-14k gold. What is key really is to find a truly honorable refinery that is totally committed to competence and is eager to make sure that OUR analysis (by whatever method) correlates to THEIR analysis (generally fire assay or ICP). Then if one can establish trust that our #s and their #s have a correlation with little variability, then one can have an honest and profitable relationship.
My advise, is find someone who is large enough and who WANTS your Au on a long term basis and is willing to build this correlation. One who will freely share their data and compare to your data and who WANTS to get to the point where they trust your data. Another thing we have done over the last few months is to keep retains of the drillings of all the bars shipped out. When we set up fire assay testing, I want to fire assay those retains and compare to fresh XRF measurements. One thing that happens out there is that buyers seem to set up their XRFs to measure low. We want ours to be right on and be able to prove to our customers that it is right on. Having fire assaying capabilities will at least allow us to establish that confidence retroactively. It will also allow us to go back and double check all the numbers that the refineries reported (and find out how much material we did not get paid for-almost always is in their favor, isn't it?).
Sometime in the next few months I would love to be able to report on this and see how close the precision of our XRF comes to the fire assay results. It should be fun to do but very time consuming. It will also help in getting better mixing. Although using an induction melter, we wonder if improvements can be had.
I hope this experience helps new people in their decisions about who to work with and what to look at.