I go to case in oakland ca. They have a magnet that sorts out non ferrous as it comes to the shred pile. It is a two man operation one one the magnet picking up metal then dropping it to the side of the pile then the worker on the ground picks the non ferrous out and the operator picks the metal back up and throws it on the pile. This way all of their shred gets sorted before it goes on the pile. The supervisor says they pull out thousands of pounds per day. The steel yard at cass takes in an avg of 500,000 lbs of ferrous per day. And by the way if you live in the bay area I would recommend going to cass they help you separate your metal and always give you way more #1 on your ticket I bring a lot of appliances and am getting an avg of about $280 per ton.