Half Yearly P&L, page-10

They pay no tax and account for no tax. They essentially have $304.6mil in tax losses at 31Dec17 and they do not bring the tax benefit of those losses amounting to $91.4mil on to the Balance Sheet so they have no tax to expense/provide each accounting period.
They did pay out $4mil in tax during this half year(that will show up in the cash flow statement) but this had been provided for in Dec17 accounts and would have related to ATO disputed amounts dating back before the above tax losses were incurred.

Depreciation and amortisation is included in the Cost of Sales figure. The major component of this is for deferred stripping amortisation.