Mark ore with the Peppermint tool and construction bots will start mining it. Or enable Nougat Mining mode and it'll happen automatically!
Mods introducing new content into the game.
New Ores and resources as well as machines.
Related to roboports and logistic robots.
It's ugly. But I also am not sure how to reign in it.
The solution (if one considers it a problem, which you might or might not) I'd prefer is to just not spill() more ore bits than fit in one tile.