Know a bloke over there who can't speak highly enough of KFS. A crowd that treats their staff well, values (and rewards) loyalty and a job well done, operates well maintained aircraft and offers a career path.
I understand they fly for more than Rio. Their clients include a fair swag of other resource companies as well.
Probably the best GA operator to get a gig with in WA.
That just about sums it up.
If you don't mind remote living in an expensive location, then go for it.