Yes, I remember that conversation. But the enhancement is "keep the copper ones and save them until the price rises further".
Ah. Actually, it's far simpler than that. Slot machines have devices in them called "coin comparators" which are very good at distinguishing coins which are the right size but the wrong material. The electromagnetic signature of a copper cent and a zinc cent are very different. Give the comparator an example of a zinc cent, and all zinc cents come out one slot, all non-zinc cents come out the other slot. Sorting problem solved. Counting and weighing by the roll are precise enough to insure no zinc cents escape the mechanism.
Not at an automated rate of 6 coins per second, completely unattended, it's not. Especially when the local bank saves bags of pennies as they become available (about 2 per month, 50 buck bags), and when the credit union one belongs to doesn't charge for the coin counter, and I need to visit there every couple weeks anyway.
Ahem. In theory, that is. Lots of work, way too complex, by all means, you don't want to do this.
Running at 34% copper right now by the way.
Dave Hinz