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I second the Auto Transporter mod — but with a caveat. Turns out, there's a lot of surface metal. This is normally balanced by how trying to find it is like the worst-ever game of Where's Waldo, but with a computer doing it, metal basically becomes a non-issue until the late game, by which time the mohole can pretty much take its place.

My suggestion would be to include this in the base game, but put less surface metal around the map — but also make meteor strikes somewhat more likely to land larger amounts.
 
My suggestion would be to include this in the base game, but put less surface metal around the map — but also make meteor strikes somewhat more likely to land larger amounts.

Great idea. Not sure developers are keen on fixing balance or not. But I hope they do and that should be built into the game. Sure the first time you play it's OK hunting the surface for metal. Then after that it's awful.