[IDEA] Tin As An Additive (like coal)

I can’t see that it would have much use as a smelted and smithed product (though I suppose you could make tin dishes and such) in itself, but adding tin as a find somewhat like coal in mining would allow for bronze. It would be used the same way: a portion of tin and a portion of copper smelted together to make a bronze ingot, which can be used in weapons.