I imagine there's a lot of somewhat valuable metals in trash: steel and copper come to mind immediately. Electronics are full of copper (though usually not in

I imagine there's a lot of somewhat valuable metals in trash: steel and copper come to mind immediately. Electronics are full of copper (though usually not in huge quantities, but if anyone throws away wire that's actually fairly valuable on the scrap market; PCBs can be processed to reclaim the copper and tin and lead), and there's all kinds of other stuff people throw away that's made of steel (including cans).