Depends on the material and the people operating the machinery. There is a variety of machinery operating in the South East One pass if you can have a person with a metal detector or an electro-magnet on a excavator checking material (Bateman Manufacturing , Canada). I have to go back and see how a grinder made in Italy got on after bad metal damage. Tigercat 6900 grinder has shear bolts etc. Tigercat 6900 grinding storm material (Cat engines 1050hp or 1200hp)(Would expect steel in a pile that big) Komptech Crambo 6000 as a primary, with steel removal and a secondary of a Rotochopper B66, MC266 etc (Minnesota) (if finer material or colored is required) Some of the short distance processing areas inside the shredder machine might need to split the logs or short blocks with a Westtech splitter etc. Rotochopper 75DK shredder Rotochopper 95DK shredder (770hp)