>>/808329/
There's also one that goes from Moonta to Lincoln. I was talking to a backseat the sauna who went over there for the horse races, he reckons if you leave Adelaide, the trips are the same time, 1.5hrs to mounts, then about 6 on the ferry or 8hrs driving up to Augusta then through Whyalla. 
I thought it would be heaps quicker. Also cost iirc $120 each way.