Places started with copper
Copper is soft, workable, and melts into a liquid at temperatures achievable by a wood fire(1100 C)
Iron is hard and does not melt into a liquid in a normal wood fired kiln, it only melts if you get it up to 1500C. You need a special charcoal fired bloomery to process iron ore so you first need a good source of iron ore *and* charcoal.
Tin, similar to copper, will completely melt so all it takes is for someone to mix the two and discover that bronze is *wayyy* harder than copper making it much better suited for weapons.
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