Mulligan is also home to a very old via ferrata which is mostly rusted away now. From memory Mt Mulligan was home to Australia's worste mining disaster.
Robs monument is still there and the bolts are ok. The base is quite overgrown, but not impossible to access. I think there is a total of 4 bolted routes ranging from 18 to 23 on carrots. Be aware that climbing on Robs monument is also forbidden (as it is on railway property). I have never had a problem climbing there though. Be very aware that the rail line is still activly used by not only the tourist train but also other rail vehicles.