my yard has me dump the steel and iron seperate, the cast all goes in one pile, the steel in another. they also pay me for "light iron" (or tin, at .10#) when its thin sheet steel. anything thick enough gets weighed seperate and payed a little better (.13 or .14) depending on the grade. i am lucky to have a yard that takes almost anything as long as its clean, and seperated/weighed correctly. i <3 NJ