Whether or not picking from the shred pile works depends heavily on the yard in question, or more specifically, the shredder that the yard has.
For example, my facility does not have a shredder. As a result, any non-ferrous that goes into my shipments to a shredder is effectively lost to me. Any non-ferrous that is pulled out worth much more to me than material that I buy on my small scales. A a result, we have one employee whose job is to pick our shred pile before it is packed for shipment.
A large yard with a modern shredder (and all of the separation technology that goes with it) is able to recover a great deal of the non-ferrous material after shredding. An important thing to realize is that non-ferrous material in the finished shred product is a no-no for mills. Copper is extremely troublesome. Zorba (primarily aluminum), Zurich (primarily stainless steel), shelmo/meatballs (shredded electric motors), insulated wire, circuit boards, etc. are all examples of what gets pulled out of the post shred stream by drum magnets, eddy-current separators, and optical separators.
As a result, it's probably a losing money scenario for a large yard to pick the pile. For a small yard, it can be close to pure profit.
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