Deep Shaft Mining.

At some point you are bound to run out of available ore. So maybe having a building that fulfils the purpose of digging deep, for that precious ore would be cool I think.
You would of course have to supply it with Oxygen for breathing, Wood/Iron/Steel/Concrete for the supports, and other more esoteric things like different chemicals for the purification of the raw ore.

Under consideration Suggested by: Jutnik Upvoted: 18 Jan Comments: 1

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