I have a question about the small wonder 'Ironworks' if I understand correctly this is a wonder that is allegedly available in the ancient age. But you can only build it if you have a city that has both iron and coal in its radius. Now what I don't understand is how are you supposed to know where the coal is if it doesn't appear until the industrial age? Does the game let me build an ironworks if I just happened to build a city in an area with both iron and coal even if I can't see where the coal is? Has anyone managed to build an ironworks?
I haven't tried to build one yet. But actually, I don't think I have ever had the option to [never had iron and coal in a city's radius at the same time].