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## Impairment loss 

At 30 June 2012, the consolidated entity reviewed the carrying amount of its exploration and evaluation assets for indicators of impairment in accordance with the consolidated entity’s accounting policy (refer note 1 (p)). As a result, the recoverable amounts of some specific exploration and evaluation assets were formally reassessed. Estimates of recoverable amounts of exploration and evaluation assets are based on the assets’ fair value less costs to sell. 

The review resulted in the recognition of an impairment loss of $21.8 million in relation to the consolidated entity’s 40% interest in the exploration permit ATP 1056P, located in the Cooper Basin in south-west Queensland. 

An impairment loss of $14.0 million was also recognised in relation to the consolidated entity’s geothermal exploration assets located in Victoria, Queensland and New South Wales. 

The impairment loss of $35.8 million (2011: $nil) is included in other expenses in the line item ‘impairment loss on exploration and evaluation assets’ in Note 7. The impairment loss of $35.8 million has been recognised in the Upsteam Gas operating segment. 

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## Depreciation and amortisation expense 

Depreciation and amortisation expense of $15.8 million (2011: $17.0 million) is included in the line item ‘depreciation and amortisation’ in the income statement. 

