My city-state ally has two sources of coal - one of which is even located on a mine. I could really use some coal right now. What has to happen before I get some coal? Is there anything that I could do to speed it up?
If one of the sources of coal is unimproved (or has something other than a mine), you should be able to pay to improve the resource. If there is already a mine on a hill with coal, you have to wait for the CS to get the Industrialization technology.
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