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<p>[QUOTE=&quot;medoraman, post: 3174100, member: 26302&quot;]I don&#039;t know about those books, but here is the Wiki article on the subject saying &quot;South American had full metallurgy with smelting and various metals being purposely alloyed&quot;. Again, from what I read on the subject, the copper plates were made in Ecuadorian Incan lands for trade with Central America. Eventually, what the Central Americans were doing with the plates got back to the Incans and they made various &quot;denominations&quot; of spades (all MUCH rarer than Central American pieces).</p><p><br /></p><p><a href="https://en.wikipedia.org/wiki/Metallurgy_in_pre-Columbian_America" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Metallurgy_in_pre-Columbian_America" rel="nofollow">https://en.wikipedia.org/wiki/Metallurgy_in_pre-Columbian_America</a></p><p><br /></p><p>Many 2017 papers referenced here. Maybe those books you suggest are out of date?[/QUOTE]</p><p><br /></p>

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