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I have a Crush-Rock-to-Sand Blueprint that absolutely requires tier-2 Belts, in order to not become a spaghetti mess of tier-1 transports. So that's one example of a BP that legitimately needs a tier-2 component.
But try hard to stay at tier-1, because if you can't use a particular BP, the game just shows you a lock symbol. It doesn't tell you what specific Tech or Techs you need to research to remove the lock symbol.
I'm pretty sure there aren't any off-site Iron or Copper Mines you can utilize, but I think there are Contracts to trade stuff to get Iron Ore or Copper Ore. Favourably, even, if you have a good industrial setup. Although I haven't yet progressed so far as to use Contracts, myself, since I start over a lot.