Consolidated  Notes to the  Financial  Statements 86 Impairment loss Depreciation and amortisation expense Depreciation and amortisation expense of $17.0 million (2010: $17.7 million) is included in the line item ‘depreciation and amortisation’ in  the income statement. No impairment loss has been recognised for the year ended 30 June 2011. In the 2010 financial year, the consolidated entity reviewed the recoverable amount of exploration and evaluation expenditure incurred in  respect of petroleum exploration licence PEL 103 in the Cooper Basin, South Australia. Recent exploration activities were determined to be  not supportive of a commercial coal seam gas development, and as a result, an impairment loss of $13.9 million was recognised for all the  gas-related exploration and evaluation expenditure. The impairment loss of $nil (2010: $13.9 million) is included in other expenses in the line item ‘impairment of exploration and evaluation  assets’ in Note 6. 2011 2010 $m $m Note 19 – Oil and gas assets Producing assets Balance at beginning of financial year  333.4 295.2 Additions  55.0 55.9 Acquisitions through business combinations (Note 42)  104.5 – Transferred to property, plant and equipment (Note 20)  (14.5) – Depreciation and amortisation expense  (17.0) (17.7) Balance at end of financial year  461.4 333.4 Cost (gross carrying amount)  536.0 391.0 Accumulated depreciation, amortisation and impairment  (74.6) (57.6) Net carrying amount  461.4 333.4 2011 2010 $m $m Note 18 – Exploration and evaluation assets Balance at beginning of financial year  607.5 569.9 Additions  30.7 52.7 Acquisitions through business combinations (Note 42)  19.8 – Impairment loss  – (13.9) Transferred to property, plant and equipment (Note 20)  – (1.2) Balance at end of financial year  658.0 607.5