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All of the industry buildings so far have added a little tag to items showing what town they were created or processed in. Since excavation is about digging and excavating common ground blocks, the industry building could produce dirt, sand, and gravel with a tag saying something like "Excavated in Citadel".
As far as a name and a specific thing that makes it unique, I'd called it the Quarry, and possibly make it a kind of dirt/sand/gravel gen in which you have Haste II. Being able to collect these blocks in your town without destroying the landscape would be an added bonus for keeping the map semi-presentable, and with the haste it's convenient enough that people will use it. Maybe not as often as they use something like the Arcanum, but it'd definitely be useful.
EDIT: Also, clay. Clay is also a common ground block commonly excavated from a quarry.
What if the quarry were to allow you to have a standardized enchantements for shovels at different costs (and for shovels ONLY).
5 levels for Efficiency 1/Unbreaking 1
10 levels for Efficiency 2/Unbreaking 2
15 levels for Efficiency 3/Unbreaking 3
20 levels for Efficiency 4/Unbreaking 3
25 Levels for Efficiency 5/Unbreaking 3
30 Levels for Efficiency 5/Unbreaking 3/Silk Touch 1?
Me.Because who doesn't need more flint?
Q: Does the amount of levels saved by the Arcanum increase at level 75 and 100 enchanting?