Hoard your coins, the banksters buy them at face value from the mint, they are treasury money and will survive the frn's collapse.
Every dollar of coins in your jar is a dollar out of the pockets of the people that made things this way.
https://www.federalreserve.gov/faqs/currency_12771.htm

Nickels and pre-1982 pennies are already worth more as scrap.
http://coinapps.com/base-metal/coin/calculator/