Could someone make a mod to allow a mine shaft or maybe a cave entrance in a settlement to be placed. You could then assign a settler to it (maybe more than one to increase efficiency) and they would then mine for different resources(gold,silver,copper aluminium...etc) randomly ( odds of getting certain resources could be biased on they value and /or rarity of each). I do not really have any modding experience but thought this would make a really good mod.