In 1985 i worked in Nullagine (Metallurgical Section) processing deeps ore from both 1 & 2 mines, both had complex mineralogy (refractory) and processed using complex Pressure Leach technology - some of those tests failed economically.
Now on the positive side, todays Met technology exists to treat this material economically but they are yet to come away with a new plant flowsheet to support it.
If they crack this i will be the first jump in with both feet as this will be a $2 company out the other side.