I think there's a signficant difference between buying and selling gold to make money in a going economy, versus holding gold and silver for the end of the economy event.
When you hold gtold and silver for an end of cvilization scenario, you are assuming that your gold and silver will buy you something you actually need....like CHICKENS.
So your Krugerrand might actually not be worth a chicken in truly hard times.
Might I suggest that it might make more sense to store up things that you'll actually need?
Coffee, cigarettes, drugs, food, guns, ammo, those are the KINDS of things you'll and everybody else will be needing.
Gold and silver might you buy you stuff...then too, it might not.
Your starving children aren't going to be clamoring for GOLD, they're going to be crying for FOOD.
Just a thought.
Plan accordingly.