Well Snake,
You can try this.
In the early 1980's copper prices rose to where it it cost more than a penny to make a penny.So they began to make them mostly of zinc.
You can try this. Start putting copper pennies on a scale until you get 1 pound.
( I am not sure if copper falls under the precious metals category i.e.12 oz., or 16 oz. to the pound.) Then count the pennies on the scale.
Suppose you had 200 pennies to the pound and copper prices were paying $3.00 per pound you would be in business !!!
I know that scrap copper prices usually run hand in hand when scrap aluminum prices rise and right now aluminum is kinda high (.65 cents)
Let us know what you find out,
Mike in SC