A copper-zinc alloy is found, and assumed orichalc. The metal of Atlantis!
... well, of Plato's Atlantis. Remember that Plato tells moral fables, not histories.
As to why we'd want 90-100% copper-zinc with trace bits of nickel... er. It's purdy? Holds shape better than gold? Not much resale value in stealing it like you'd steal gold? Apart from all that, both copper and zinc have antibiotic properties; although if anyone actually thought to make syrurgic instruments with this stuff, I am unaware.
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