Fairly new to this game, but it's my understanding that to gain more strategic resource output, that resource must be worked. I'm working three iron mines, 1 in my capital adjacent to the city tile that yields 2, and 2 in another city that yields 6 and 2 (not adjacent to the city tile). By working them I mean I've checked them in the city view so they're green.
Still, my overall iron output is only 2, and is used up by 2 longswordmen units, so I can't produce any catapults.
Is this a bug, or am I doing something wrong?
Any help much appreciated :)