I was referring to snow locations that have minimal tundra but 3 iron deposits and then oil. It has happened too frequently in Civ 5 and Civ 6, even past vanilla. I think it has something to do with the original script of the game requiring two of the same resources to build resource dependent units. Trust me I'm all for having to colonize and take land; but having disproportionate resources placed in snow areas is ridiculous. Its certainly not a matter of not wanting to invest in late game cities or colonies. I do think you have an excellent idea for infantry and tanks, but take that a step further and incorporate aluminium for jets and jet bombers. I remember it took about a month after launch to re-balance the resources for BNW. They had fixed it but it temporarily broke. As for coal, yea I remember how no matter what there was never enough.