Yes, remember it well. The initial reason was to fly fuel into Ok Tedi at Tabubil when the Fly River dried up and the barges could not get through to Kiunga.
Some vague recollection suggests it was an ex RAAF C130A but I doubt that as I don't think the military C130 could be registered in Australia? (Three ex RAAF C130A's were registered in the Philippines by Aboiltz Air Freight.)
It was an Australian Company, think they eventually went broke?