This is very minor, but it's also a very minor fix!
In Artdefine_Landmarks, copper mines are using the same "medieval" model for both of their pillaged states. There should be a "medieval" model and an "industrial" model. (And there "is" a PL_IND_Mine_Copper.fxsxml in the folder.)
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So in the industrial era and later, you have updated copper mines, and when they're pillaged, they revert back to the earlier pillaged graphics, until repaired.
(I would create a little mod to fix it, but I rather not reload the landmark system with the farm crash bug still present.)
In Artdefine_Landmarks, copper mines are using the same "medieval" model for both of their pillaged states. There should be a "medieval" model and an "industrial" model. (And there "is" a PL_IND_Mine_Copper.fxsxml in the folder.)
So in the industrial era and later, you have updated copper mines, and when they're pillaged, they revert back to the earlier pillaged graphics, until repaired.
(I would create a little mod to fix it, but I rather not reload the landmark system with the farm crash bug still present.)