endless iron mines have been asked for before, more than once. If that was going to happen i believe it would have done so already, This thread is for coal mines, As it stands right now I hardly produce enough of it and I do buff. With the new smelter and weaponsmith I will have to either triple buff coal or pause copper. While I wouldn't say pausing copper is a massive drama, Coal its self is a very low level resource, much lower than iron is. therefore I don't think it would effect the overall economy to much to increase the coal levels coming into the game via a couple of endless mines.