Tetrahedrite and chalcopyrite veins no generated in the overworld?

In some worlds I’ve been hit smack in the face with Galena limestone cliffs for chunks and chunks, other times it’s once in a blue moon, a single galena rock on the ground. This instance I’m surrounded by bang up straight iron deposits, not even hematite, to the point where I believed I had a bug and had somehow wound up in vanilla.
I think it may be just luck of the draw, a percentage encounter mixed with the type of seed you have. Try creating a new world with a different seed and see how you fare.

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