ABSTRACT
Rob looked again at the smelter flowsheet he had sketched in the course, which seemed a long time ago now. The flowsheet had the entire smelter on it, and that was good. But, because of that, it didn’t identify what was really happening inside the potrooms. It looked like a black box. Rob smiled. Yes, that was how his boss described the potroom, a black box, full of things that would trip you up and run you over before you knew it.
