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Whitehaven Coal Limited : Annual Report 2013
128 Whitehaven Coal Limited Annual Report 2013 Notes to the Financial Statements 30 June 2013 Mineral reserves and resources The estimated quantities of economically recoverable Reserves and Resources are based upon interpretations of geological and geophysical models and require assumptions to be made requiring factors such as estimates of future operating performance, future capital requirements and short and long-term coal prices. The consolidated entity is required to determine and report Reserves and Resources under the Australian Code for Reporting Mineral Resources and Ore Reserves December 2004 (the JORC Code). The JORC Code requires the use of reasonable investment assumptions to calculate reserves and resources. Changes in reported Reserves and Resources can impact the carrying value of property, plant and equipment, provision for rehabilitation as well as the amount charged for amortisation and depreciation. Overburden in advance The consolidated entity defers advanced stripping costs incurred during the production stage of its operations. This calculation involves the use of judgements and estimates such as estimates of the tonnes of waste to be removed over the life of the mining area and economically recoverable reserves extracted as a result. Changes in a mine's life and design will usually result in changes to the expected stripping ratio (waste to mineral reserves ratio). These changes are accounted for prospectively. Recovery of deferred tax assets Deferred tax assets are recognised for deductible temporary di erences as management considers that it is probable that future taxable pro ts will be available to utilise those temporary di erences. Taxation (Including MRRT) The consolidated entity's accounting policy for taxation requires management's judgement as to the types of arrangements considered to be a tax on income in contrast to an operating cost. Judgement is also required in assessing whether deferred tax assets and certain deferred tax liabilities are recognised on the statement of nancial position. Deferred tax assets, including those arising from unrecouped tax losses, capital losses and temporary di erences, are recognised only where it is considered more likely than not that they will be recovered, which is dependent on the generation of su cient future taxable pro ts. Deferred tax liabilities arising from temporary di erences in investments, caused principally by retained earnings held in foreign tax jurisdictions, are recognised unless repatriation of retained earnings can be controlled and are not expected to occur in the foreseeable future. Assumptions about the generation of future taxable pro ts and repatriation of retained earnings depend on management's estimates of future cash ows. These depend on estimates of future production and sales volumes, operating costs, restoration costs, capital expenditure, dividends and other capital management transactions. Judgements are also required about the application of income tax legislation. These judgements and assumptions are subject to risk and uncertainty, hence there is a possibility that changes in circumstances will alter expectations, which may impact the amount of deferred tax assets and deferred tax liabilities recognised on the statement of nancial position and the amount of other tax losses and temporary di erences not yet recognised. In such circumstances, some or all of the carrying amounts of recognised deferred tax assets and liabilities may require adjustment, resulting in a corresponding credit or charge to the statement of comprehensive income. Mineral Resource Rent Tax (MRRT) The MRRT legislation allows for a starting base allowance, which will be amortised and applied against the future MRRT liability. The starting base allowance is calculated as the market value of the mining and pre-mining project interests and underlying upstream project assets as at 1 May 2010. The starting base is designed to recognise investments in assets that relate to the upstream activities of a mining project interest or pre-mining project interest (starting base assets) that existed before 2 May 2010. For accounting purposes, the starting base allowance represents the MRRT tax base of the mining project interest or pre-mining project interest. The market value of the starting base was determined using a discounted cash ow methodology that requires signi cant judgements and estimates including: • forecast production pro les; • forecast future coal prices determined with reference to independent resource sector analysts; • the calculation of appropriate discount rates; • expected royalty rates payable; and • the reserves estimates for the mines. 4. SIGNIFICANT ACCOUNTING JUDGEMENTS, ESTIMATES AND ASSUMPTIONS CONTINUED
Annual Report 2012