On a very quick scan, here are some more, South East of Darwin, that aren’t on the WAC but are on VTC/VNC:
Mt Bundy Mine (YMBN)
Anaburroo (YANR)
Kapalga (YKPG)
Wildman Lagoon Camp (YCWC)
Shady Camp (YSHA)
....
Anyone like to nominate a hive of aviation activity that isn’t marked on any aeronautical chart?