I've always considered these lists of component values as being next to worthless, especially when plating was involved. These lists assume that the parts are consistent in their values and that's not true at all. There are variations due to different manufacturers and different customers. Plating thicknesses can vary from day to day and even hour to hour due to chemical changes in the plating bath. They can also vary from part to part even though they were plated at the same time on the same plating rack. If you separately analyzed 2 parts that were plated together, I guarantee that you would get different numbers.
From experience I can say that Chris is completely correct in this statement. In fact there's a pile of wrong information even on here about plating thicknesses especially when it comes to things like pins. Statements on the lines of "pin yields are never above xxx or 100g of pins = 0.1g of gold" cannot be held as accurate because put simply every batch of pins is different by application. The same applies to plating. When you've seen enough of it you know that you may be able to say something like "the flash plating on an HP xxx revision 1 motherboard is yyy microns thick" but you cannot realistically go any further without that level of specification. As such you're going to have to introduce more fields on your information to qualify the raw material if you want to make this useable.
Personally, if I were spending good money to buy a lot of PM bearing electronic scrap, I would never, ever trust anyone else's numbers. That's a good way to go broke. To me, a basic part of being a refiner is to be able to accurately sample and assay material on your own. If you can't do this, you are much more likely to lose money.
Too right. Do your own figures, and those figures are going to cost you money to obtain. Consider it the cost of doing business because if you listen to half the twoddle printed about yield data you'll spend most of your time losing money.
I don't think it's possible for Tzoax, Ken, myself, or anyone else to compose a totally reliable list of component values.
Again I agree. I also think that the database will probably end up being populated by "old school" information from other threads and "fact sheets" to fill it out, thereby perpetuating a lot of the inaccurate information out there.
I do wish you all the best with it though regardless of my personal feelings and i hope it becomes a great tool. I just see it at the moment as something that's a great idea but flawed in practise for the reasons stated above.