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Whitehaven Coal Limited : Annual Report 2009
Whitehaven Coal Limited -- Annual Report 2009 53 NOTES TO THE FINANCIAL STATEMENTS 30 JUNE 2009 3. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED) l) Deferred stripping costs Expenditure incurred to remove overburden or waste material during the production phase of a mining operation is deferred to the extent it gives rise to future economic benefits and charged to operating costs on a units of production basis using the estimated average stripping ratio for the area being mined. Changes in estimates of average stripping ratios are accounted for prospectively. For the purposes of assessing impairment, deferred stripping costs are grouped with other assets of the relevant cash generating unit. m) Leases The determination of whether an arrangement is or contains a lease is based on the substance of the arrangement and requires an assessment of whether the fulfilment of the arrangement is dependent on the use of a specific asset and the arrangement conveys a right to use the asset. Consolidated entity as lessee Finance leases, which transfer to the consolidated entity substantially all the risks and benefits incidental to ownership of the leased item, are capitalised at the inception of the lease at an amount equal to the lower of the fair value of the leased asset and the present value of the minimum lease payments. Lease payments are apportioned between the finance charges and the reduction of the lease liability so as to achieve a constant rate of interest on the remaining balance of the liability. Finance charges are recognised as an expense in the income statement. Contingent lease payments are accounted for by revising the minimum lease payments over the remaining term of the lease when the lease adjustment is confirmed. Capitalised leased assets are depreciated over the shorter of the estimated useful life of the asset and the lease term. Operating lease payments are recognised as an expense in the income statement on a straight-line basis over the lease term. Operating lease incentives are recognised as a liability when received and subsequently reduced by allocating lease payments between rental expense and a reduction of the liability. n) Impairment (i) Financial assets A financial asset is assessed at each reporting date to determine whether there is any objective evidence that it is impaired. A financial asset is considered to be impaired if objective evidence indicates that one or more events have had a negative effect on the estimated future cash flows of that asset. An impairment loss in respect of a financial asset measured at amortised cost is calculated as the difference between its carrying amount, and the present value of the estimated future cash flows discounted at the original effective interest rate. Individually significant financial assets are tested for impairment on an individual basis. The remaining financial assets are assessed collectively in groups that share similar credit risk characteristics. All impairment losses are recognised in profit or loss. An impairment loss is reversed if the reversal can be related objectively to an event occurring after the impairment loss was recognised. For financial assets measured at amortised cost, the reversal is recognised in profit or loss.
Annual Report 2008
Annual Report 2010