NWmate,
Maybe not 3000m but definately more than 3/4 in W.A. are around 2000m and sealed. Most are more than 1800m!
Telfer 2000
Coondewanna 1860
Port Hedland 2500
Karratha 1850
Kalgoorlie 2000
Paraburdoo 2132
Newman 2072
Argyle 2300
Barimunya 1940
Barrow Island 1900
Murrin Murrin 2000
on the other hand:
Leinster 1770
Mt Keith 1797
Ravensthorpe???
Where else do jets go in W.A. for mining?