Several things to consider.
1. For one thing you would really have to have a lot of Copper coins for a metal recycler to take the chance paying for a few pounds of coins.
2. Unless you know the exact location of a metal recycler that would purchase your coins, you would be driving around a lot looking for a place to accept yours. With gas prices as they are, hopefully your car gets great gas milage or the cost of gas would surpass what you would profit.
3. I suppose you already know that calling a metal recycler and asking over the phone if they would purchase you Copper coins would not get a great response.
4. There are some metal recyclers around me that have been known to contact the authorities about individuals attempting to sell coins.
5. You may end up having melted a coin worth hundreds or even thousands as a coin value.
An altenative is to purchase a smelter for metal. Melt down all coins. Learn how to separate Copper, Gold, Silver, Zinc, etc from the pile of stuff you just melted. Ship all to Mexico for producing jewlery.

