I was bumbling around my world the other day and found a clothing trader. Directly underneath the cart was a hole in the ground.
After wandering around inside, I found the following:
1 High quality zinc
1 Abundant quality zinc
1 Medium quality Bismuth
1 absolutely gigantic Medium quality Iron
numerous saltpeter, lead, and sulfur deposits
Honestly, I am not sure if the iron is one node or two, but its massive.
I was really struggling to find anything beyond copper, and hit an insane jackpot.