Not that anyone cares, but one theory I have on why Sulphur Springs is being delayed may be due to site access.

Knowing the location is 50km west of Marble Bar, this is the approximate location from Google Maps

Turning on Satellite

And zooming in .. you get a good idea of the project location which happens to be near the appropriately named "Sulphur Springs Museum"

Most of the roads here are all dirt tracks

Personally I think DVP should stick to underground mining services and maybe even hiring out unused equipment until prices recover