New material and yield

goldscraphobby · Jan 28, 2020

I got some new material and normally do not weight before & after but curious on this so I did.
The initial amount was 2lb 11.4oz
After AP & cleaned it was 1ib 14.4oz
Gold & some minor junk is 47.6g
The gold still needs to go through another cleaning, its a lot more than I expected. even if there 20g of junk (I don't think there is) I'll still be happy with the amount.

niks neims · Jan 29, 2020

goldscraphobby said:
I got some new material and normally do not weight before & after but curious on this so I did.
The initial amount was 2lb 11.4oz
After AP & cleaned it was 1ib 14.4oz
Gold & some minor junk is 47.6g
The gold still needs to go through another cleaning, its a lot more than I expected. even if there 20g of junk (I don't think there is) I'll still be happy with the amount.

What's the material, where's it from?

g_axelsson · Jan 29, 2020

Looks like cut-outs from lead frames. There were a chip manufactured in the middle of each of those frames, this is just the leftovers. Nice scrap anyhow.

I'm sorry to say, but I think you are right and you will see a quite a large percentage of that gold disappear if you melt it or refine it. Foils could look dry but contains quite a lot of moisture and probably some nickel too. My guess based just on a hunch... 5-10 g of junk, the rest gold.

If you have a buyer that pays on gold content then you could just go on and melt it, but it's really easy to do the refining when it's foils.
I would do a final refine of this, but that's my opinion.

Göran

goldscraphobby · Jan 29, 2020

They are the left over leads frames from a custom IC. Would love to get the scrap IC's but that is not possible.
Because of where they come from and application the plating was heavy but was only expecting a couple grams, so any loss from this total does not matter.
I will do more refining, want to get it the purist I can.

jarlowski1 · Jan 29, 2020

I suspected that they might be lead frames. I will have to agree with Goran on the yield. My own personal guess was a bit higher at 12 grams. Would like to know the results.