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I upgrade my advanced industrial plots manually. The iron mine appears to have only 1 upgrade: the steel mill. All the others always have 2 options. I understand that some industry unlocks other types; so I've tried mixing iron mines with several other industrial combinations. Yet I'm always stuck with the sole choice of the steel mill.
Is there an alternate branch? If so, what combination unlocks it? More broadly, is there a documented tech tree? I've tried the wiki, but didn't find anything.
Is there an alternate branch? If so, what combination unlocks it? More broadly, is there a documented tech tree? I've tried the wiki, but didn't find anything.