I'm still not sure why it would be so unlikely for mithril to travel to Beleriand -- simply because of the distance and the danger? Not likely, tea, spices and silk were coming from China to Europe regularly throughout the 1200s-1400s. That was a distance easily greater than what we're talking about here and through dangers like we can't imagine...and that was by puny humans! It seems to me that if you have a race as hardy (and as eager for money and trade) as the Dwarves, and a race as indefatiguable and long-lived as the Elves, trading across long distances and difficult terrain is hardly a barrier!
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Scribbling scrabbling.
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