Chookcooker - preferably with the wheels up!
If you realised at first that you didn't have enough fuel to get to Melbourne, you wouldn't try and make it would you? Perhaps that answers your query maggot.
Part 2 of that: If you were going to go below minimums, would you do it at Adelaide or Mildura. We know the obvious answer to that but we won't know what happened until the conditions can be compared. Hindsight is a great thing.
Part 3 - did the aircraft not have enough fuel to get from Mildura to Adelaide....?