No, it was Opal Air. They ran from Coober Pedy, to Andamooka, and Adelaide starting with a C205, then a 310, then a 402, followed by a 421. I think they were all registered VH-BUD (in turn). Then they expanded, with more 421's. It was a copy book operation, with a small group of pilot/lames.
Then they got a Merlin, and then the company folded. Maybe there is a lesson in that.
I believe the second one was Port Augusta Air Srevices, running from Port Augusta to Port Pirie, and Adelaide, starting with a cherokee six.