1904 $20 Liberty Double Eagle XRF Results-Genuine? - Page 2

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Author	Replies: 22 / Views: 3,066	Page: of 2

sel_69l Bedrock of the Community Australia 21645 Posts	Posted 04/12/2023 11:03 am As an aside, I bought a Double Eagle MS-61 in 2003 for US$ 395. (Average inflation rate over the last 20 years according to the Australian Bureau of Statistics is 2.49%) So, in theory, the coin should now have a value of about US $650. So for lib9955: Keep it for a few years, if you can. Report this Post to the Staff
lib9995 New Member Australia 41 Posts	Posted 04/14/2023 06:37 am It's definitely in the keeper stack ! Report this Post to the Staff
jecz79 Valued Member Portugal 478 Posts	Posted 04/18/2023 7:47 pm What surprised me was the ruthenium in the coin. I knew platinum was a problem impurity in some gold mines in spanish america. Ruthenium is of the same group. Is is a common impurity also in the gold used for coins? Not saying I doubt the coin. I am just curious. I may try the gold shop with a friendly owner I have nearby and ask for a test on my eagles. Edited by jecz79 04/18/2023 7:50 pm Report this Post to the Staff
sel_69l Bedrock of the Community Australia 21645 Posts	Posted 04/18/2023 8:12 pm XRF hand held instruments are not as sensitively accurate as many may think. I note that the acceptability range for the particular instrument used in this case is in the range of 89.8% to 90.21% for the gold readout. That is OK, to my way of thinking. Ru could well show up in the analysis, but hand held instruments may well detect any element but the accuracy for some hand helds could well be in the range of about 0.2% to 0.4%, and still be acceptable for that particular instrument. The other factor is to what degree of purity the refiners (or the MInt) wish to refine their gold, and still be acceptable to meet the required purity standards suitable for the gold coinage. Other than make a general comment in this regard, I do not know enough in an accurate and absolute sense about US standards for acceptable purity of the gold. ------------------------------------------------------------------------------------------------------------------------------------------------ For really accurate atomic (and much more expensive) analysis, mass spectometry is needed. Report this Post to the Staff
lib9995 New Member Australia 41 Posts	Posted 04/23/2023 03:37 am Hey guys, I got it tested on a different xrf machine, these are the results. Lemme know what you guys think, I think looks ok Report this Post to the Staff
lib9995 New Member Australia 41 Posts	Posted 11/17/2023 02:58 am ive xrf tested some various other pre 33 gold and they all are showing 0.3 of AG in the results Report this Post to the Staff
colonialjohn Pillar of the Community United States 1721 Posts	Posted 11/18/2023 1:27 pm Ag is a carry over mining ore contaminant and Ru is a false positive. Report this Post to the Staff
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