Everyone in the comments is talking about how copper would accidentally melt in the fire pit.
In reality, copper melts at 2000F, and a wood bonfire only gets as hot as about 1100F without a strong draft.
It does become malleable though. I’d imagine that this is how people initially started using it – heating it, then making ornaments, jewelry, etc out of it.
They would have already been familiar with using fire to process other materials at that point – they would use fire to harden wood and make it rot resistant. They would also heat clay when making pottery.
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