Idea: Mining Expeditions

Went to a hidden stash to find treasure and decided to stay longer because it was in a mountain tile full of iron, which my settlement was running out of (I play on a Valley type map, small sized)

Couldn't stay for long and get all the resources, game booted me out of it saying I had to leave :( but I got to carry a bunch back home

I think it would be cool if we could send caravans just to acquire resources that have run out at your tile, maybe make other factions guard them since they are valuable, I can easily imagine a "gold mine" tile defended by other kingdoms and such

If we don't want to expand this system then just let me stay on the treasure tiles for however long I want, I even made them a little shelter that went unused :(