Great game, and thanks for responding to comments/patching bugs so quickly. Currently the automated mining of Zirconium and Copper seems to be bugged. They don't seem to produce when the tab isn't in focus. For example, I'm producing 1k unrefined Copper per tick (with no refining/smelting active), but after an hour leaving the game running in the background I only have 20k unrefined Copper. Tungsten seems to work fine, though.
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 "Defender Idle 2"){kind=icon}
Will be fixed in the next patch, thanks.