Ann: Significant Mineralisation Beyond Reserves at Williamson, page-38

Random numbers but as an example:

Total HO/Corporate admin costs of $6m

H/C admin costs apportioned to production $2m - included in AISC and included in the Cost of production line in the Annual Report
H/C admin costs remaining $4m - not included in AISC and included in the line Administration costs in the Annual Report

I'm not stating the above as correct, it's just how I've seen every other miner account for it when I have seen the workings or there's enough information in the 5B and Annual Report.