Yes, mostly 30metre. It’s not just about which aircraft “can operate into them”. The mining airports were set up around 90-100 seat aircraft. With the big advantage of no GSE for loading as F100 and BAE146 have low door sills for the hold and can be loaded from the trolley or ground.
The mine site terminals struggle with 170+ passengers at a time leaving and arriving. They prefer frequency to volume.
The 100-115seat market remains viable for FIFO. The QF guys did not understand that when taking over Network, VARA with a Skywest heritage understood much better.