Does the "Deep Mining" upgrade do anything in Iron Will mode?
I'm currently playing Iron Will, and am at the point where I need tons of coal. Normally, the Deep Mining upgrade adds a coal per tick for each miner you have, however, since I don't have any kittens, I don't have any miners.
Does this upgrade have a hidden extra effect in Iron Will mode, like, say, meteors made of coal? Or is this upgrade completely useless if you don't have any miners?
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Deep Mining 1.15.2 Forge Mod Overview
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