Recent research projects based on lead isotope and chemical analyses of Bronze Age artefacts from Scandinavia prove unequivocally that the local ore deposits had not been used and that the earliest copper-based metals are isotopically consistent with the copper from the Welsh mine in Great Orme, the Austrian Alps, and the Slovak Ore Mountains. However, from the 2nd millennium BC the majority of artefacts made of tin-bronze found in Scandinavia, England, and Ireland, have the geochemistry and lead isotope compositions characteristic of the copper and tin deposits in Europe are located in the Iberian Peninsula these results should perhaps not be unexpected; however, the discovery of Iberian copper in Scandinavia, the British Isles, and Ireland in bronze artefacts of 1400-800 BC is nevertheless startling, challenging earlier thinking about Bronze Age maritime networks and Iberia as a metal producing region.
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