Not picking here , but asking a genuine question .
I know that vitamins can deteriorate , change into different compounds etc , but do the minerals do the same ? I thought the base minerals were stable ? , would only leach out in certain conditions ie in a compost heap , the soil , damp sodden conditions etc .
Been a long time since i did any chemistry , so i may be totally wrong .
As for the date on the bag , as in human food it seldom means if it has run overtime that it will be no good . It just means use caution .
Just think dried peas , beans , oats , flour , sugar , potatoes , carrots etc etc .