Silver, iron and coal very close!
It is not very effective for trade in the city of PyongYang to trade iron by copper, since in the center of the map there is a bit of everything from the ores, it could be more divided for example not having silver and copper in the center, as it has iron and coal, if not some city like PyongYang which is further to the northwest and has a lot of copper.
This discourages commercial caravans from coming to the northwest to trade.
Or even to the city Deskrausser that has Silver.
there are cities really low attractive, our placement showed this clearly
A replacement of resources in some areas is fundamental imho
otherwise we need to place rare monsters or other stuff in areas that have less attraction by resources