What could limit geographically a resource such as an ore to a specific spot on a planet?

In a world naturally formed where some magic exists but is mainly used by sentient species, I'm trying to come up with a more or less scientific way to explain how this special, rare ore (going to be used for fine crafting) could be found in only one place on the continent ?

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What could limit geographically a resource such as an ore to a specific spot on a planet?

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