Initial studies into the effect of the mining boom indicate ~500,000 more people will be required by 2027, of those ~322,000 will required to be skilled (hence more $ to spend in the city).
They propose $24 billion over the next 20 years to be spent on mining in SA alone, of that 11.5b in the next 5 years, and that is very conservative since the olympic dam expansion will probably be more than this alone (I think that they were still using the 7billion figure for the ODX in these estimates). Add to that the 11.5b from defence spending and we are looking at a WA type or even bigger expansion very soon!!!
Bring on the 500m light square tower!! haha