Hang on a sec, if the idea is to conduct RPT because there's mining operations at the destination, wouldn't you simply continue to offer a FIFO service.
How does a local pop. of just 7000 now make RPT more viable for the speculated Roma-Sydney?
If you haven't secured FIFO contracts already, why would RPT to the same destination, carrying the same pax be a more robust business model? As soon as mining contracts, so too will the 'RPT' operation. How's that a long term RPT strategy?
If in fact you tried to secure FIFO and failed, well, logic says don't start an RPT operation.
As far as I can summise, new route RPT operations often aim to build/ create markets from what initially appear to be quite marginal customer bases.
Is that Roma-Sydney? Not sure it is.