Ann: FY16 half year guidance on significant items, page-4

Basically, the exploration assets have been written off the balance sheet as they don't envisage at this point in time of doing further work (appraisal and potentially development) on those permits so you have to write them off the balance sheet. The $70m would have been spent in previous years so it's 'non-cash' in relation to the current financial year. The money, however has a,ready been spent. This does not mean that if the curse price goes in future they do not undertake further work in these permits to try and shore up reserves, in which case it may be reversed. These are 2C resources.

Good point is that their producing assets (ones which are producing and making cashflows) don't need impairment . These are 2p resources.