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<p>[QUOTE=&quot;coppermania, post: 852607, member: 18304&quot;]I&#039;m not a scientific expert on the subject but I do know that some gold has copper naturaly laced within it. I live and prospect gold in the Black Hills of SD and our local gold is abot 80% pure from the ground. When I melt my fines, sometimes the glob has a coating of copper and silver on the outside. I presume the lighter metals rise to the surface and I use a touch of nitric acid to disolve the non gold metals. Now consider that Homestake goldmine pulled 40 million OZ out over 135 years and shipped it all to Denver in the early days in 100 lb. blocks (to keep thieves from going far with their loot). Our local mining history is really cool. So imagine that in 1914 what the standards were in the refining process, not quite what I would expect out of a modern gold buffalo or double eagle. I also see many gold coins offered in the Bowers and HA catalogs that have copper spotting. I would rely on die characteristics to determine authenticity and worry if your coin is missing the ones that the many books outline. Be glad the spot is on the tail and not on the portraits nose![/QUOTE]</p><p><br /></p>

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