Raw material prices in general have skyrocketed in the last five years, sending copper prices to record highs of $4.16 a pound in May. Copper pennies number 154 to a pound. Prices have since come down from that peak but could still trek higher, Velde said.

Since 1982, the Mint began making copper-coated zinc pennies to prevent metals speculators from taking advantage of lofty base metal prices. Though the penny is losing its importance — it is worth only four seconds of the average American’s work time, assuming a 40-hour workweek — the Mint is making more and more pennies.

Velde said that since 1982 the Mint has produced 910 pennies for every American. Last year there were 8.23 billion pennies in circulation, according to the Mint.