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Metal Contents of Silver and Gold Ingots and Coins from 16TH-18TH Century Spanish Shipwrecks
Published online by Cambridge University Press: 26 February 2011
Abstract
Neutron activation analysis of metal-rubbing samples from over 500 silver and gold bars and coins resulted in data for the silver, copper, and gold contents of the objects. The analysis of gold coins (from a 1715 shipwreck) minted in Bogota also showed detectable levels of the metal iridium (>0.002%) whereas gold coins from other mints did not. The presence of detectable iridium, therefore, might serve as a diagnostic indicator of early 18th century gold of Colombian origin. Data are also given for silver and gold ingots from a (ca. 1520s) shipwreck off the coast of the Bahamas and for silver bars from the 1622 Atocha shipwreck.
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- Copyright © Materials Research Society 1995