I got interested in the mines in Wales when the TV series 'Poldark' came out in 2015. Part of the storyline concerns copper and tin mines in Wales, which gave me to wonder how long the Welsh mines had been active and whether they might have exported it off that stinkin' island during the Bronze Age. Even back then there were records of 'foreign interests' (my term) coming to Wales to buy from them.
So even that long before Lindesfarne, I always figured it was a short trip across the channel, and from there a few weeks by packhorse to Scandinavia.
Bronze Age discovery reveals surprising extent of Britain's trade with Europe 3,600 years ago
31 October 2019
...[E]arly trade between Britain and Europe was much more widespread than previously thought. Our new research reveals remarkable evidence of a copper-mining bonanza in Wales 3,600 years ago that was so productive that the metal reached France, the Netherlands, Germany, Denmark and Sweden....
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