Hi mate,
Cobham flies to Moomba (regional SA) and Ballera (southwest QLD) from Adelaide. I believe they fly to Moomba twice a day mid-week, once in the morning and once in the afternoon, and do a 'triangle' flight (Adelaide-Moomba-Ballera-Adelaide) every Monday and Friday, with a stopover of several hours in Moomba. I'm also pretty sure that Adelaide crew are employed as casuals, as they don't get the number of hours to qualify as full time. They also fly only one aircraft out of Adelaide, a Bae 146-200, registration VH-NJG.
I noticed your location says Perth, which if that's the case you're probably far better off applying for the Perth base - they fly to Barrow Island, Barimunya, Coondewanna, Kalgoorlie, Kambalda, Murrin Murrin and Brockman, and regularly do special charters (eg. Learmonth, Broome, Karratha), on a mixture of both BAe 146-100, -200 and -300 aircraft, as well as the 'modernised' version, the Avro RJ 100.