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but they ARE obtained through mining rocks?

RIP my snow biome is right beside a mountain. I CANT go there unless I want to fight a troll, which I need to bring to the grasslands to kill, which defeats the purpose to go to snow...

I found iron in a swamp biome, pieces of "bog iron" lying on the ground the same way you find tin and flint. They were a little hard to see, since it rains so freaking much in the game.