This was not just a very brief spike like some commodity price events have been (such as the early 1950s rise in the price of wool). It was quite persistent. Not permanent, but quite persistent. Nonetheless, the peak was four years ago. Since then, as you know, prices have fallen considerably.
Today the price of iron ore is about $ per tonne, and coking coal around $ At a national level, Australia's terms of trade, having been through an extraordinary surge, have fallen by a third and are still declining.