Charlie unless you are using a very special separation or are stripping you will be surprised as to how much copper sits in the waste. I have seen, I.e. toured, plants where they told me their machine gets 99.9% of the copper. I asked them to stick their hand n the waste bin. Never fails, every time a big old electric should shock.

Expect your system to have 2-5% copper in the waste. After looking at many systems I have yet to be surprised at less.