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Breakdown of Reconciling Items (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating costs | $ (1,526.6) | [1] | $ (3,301.2) | [1] | $ (3,161.4) | [1] | $ (2,684.2) | [1]
Gold inventory change | 5.6 | [2] | 22.2 | [2] | 77.2 | [2] | 29.4 | [2]
Amortization and depreciation | (389.4) |  | (729.9) |  | (745.3) |  | (631.3) |
Other items as detailed in statement of operations | (353.1) |  | (156.8) |  | (92.5) |  | 59.8 |
Liabilities excluding deferred income and mining taxes | 2,562.5 |  | 3,687.9 |  | 3,197.3 |  | 2,052.8 |
Assets (excluding deferred tax assets) | 10,710.0 |  | 10,624.2 |  | 10,077.4 |  | 9,181.4 |
Pre-2003 management reporting |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Investment treated as available-for-sale investment |  |  | 20.00% |  |  |  |  |
Reconciling items |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating costs | (43.6) | [1] | (195.4) | [1] | (126.5) | [1] | (118.5) | [1]
Gold inventory change | (4.7) | [2] | 0.1 | [2] | 1.4 | [2] | 5.9 | [2]
Amortization and depreciation | (0.4) |  | 38.6 |  | 38.1 |  | 6.9 |
Exploration, evaluation and feasibility costs | (1.8) | [3] | (5.1) | [3] | (83.1) | [3] | (1.6) | [3]
Other items as detailed in statement of operations | (1.4) |  | (10.0) |  | 0.6 |  | 4.4 |
Liabilities excluding deferred income and mining taxes | (12.0) |  | 77.9 |  | (55.2) |  | (27.6) |
Assets (excluding deferred tax assets) | 182.4 |  | (418.3) |  | (174.9) |  | 153.6 |
Reconciling items | Provision For Rehabilitation |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating costs | 0.4 | [4] | (7.7) | [4] | (2.2) | [4] | 1.7 | [4]
Amortization and depreciation | 0.3 | [4] | 4.1 | [4] | (0.2) | [4] | 3.1 | [4]
Liabilities excluding deferred income and mining taxes |  |  | 77.9 | [4] | 55.2 | [4] |  |
Assets (excluding deferred tax assets) |  |  | (75.4) | [4] | (49.5) | [4] |  |
Reconciling items | Business combination-formation of Original Gold Fields |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Amortization and depreciation | (2.7) | [5] | (4.1) | [5] | (5.6) | [5] | (5.3) | [5]
Assets (excluding deferred tax assets) |  |  | 66.3 | [5] | 79.9 | [5] |  |
Reconciling items | Business combination-formation of Gold Fields |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Amortization and depreciation | (1.7) | [6] | (3.9) | [6] | (3.4) | [6] | (3.3) | [6]
Assets (excluding deferred tax assets) |  |  | 26.0 | [6] | 31.3 | [6] |  |
Reconciling items | Business combination-purchase of St. Ives and Agnew |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Amortization and depreciation | 0.3 | [7] |  |  | 2.1 | [7] | 0.5 | [7]
Reconciling items | Business combination-purchase of Abosso |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Amortization and depreciation | 0.1 | [8] |  |  | 1.1 | [8] | 0.1 | [8]
Reconciling items | Business combination-purchase of South Deep |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Assets (excluding deferred tax assets) |  |  | 481.8 | [9] | 507.9 | [9] |  |
Reconciling items | Cut Backs |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating costs | (52.7) | [10] | (184.0) | [10] | (144.4) | [10] | (90.0) | [10]
Amortization and depreciation | 16.3 | [10] | 41.1 | [10] | 39.6 | [10] | 54.6 | [10]
Assets (excluding deferred tax assets) |  |  | (498.8) | [10] | (354.8) | [10] |  |
Reconciling items | Amortization of reserves |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Amortization and depreciation | (23.2) | [11] | (11.9) | [11] | (23.3) | [11] | (37.6) | [11]
Assets (excluding deferred tax assets) |  |  | (197.5) | [11] | (180.9) | [11] |  |
Reconciling items | Amortization-inclusion of future costs |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Amortization and depreciation | 13.5 | [12] | 47.0 | [12] | 34.7 | [12] | 1.4 | [12]
Assets (excluding deferred tax assets) |  |  | 175.9 | [12] | 123.9 | [12] |  |
Reconciling items | Amortization-interest capitalized |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Amortization and depreciation | (3.3) | [13] | (4.3) | [13] | (6.9) | [13] | (6.6) | [13]
Assets (excluding deferred tax assets) |  |  | (18.5) | [13] | (15.2) | [13] |  |
Reconciling items | On Mine Exploration |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating costs | (3.6) | [3] | (35.2) | [3] | (22.9) | [3] | (18.3) | [3]
Assets (excluding deferred tax assets) |  |  | (379.3) | [3] | (338.3) | [3] |  |
Reconciling items | Investment In Affiliates |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Assets (excluding deferred tax assets) |  |  | (3.4) | [14] | 9.6 | [14] |  |
Reconciling items | Deferred Stripping |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating costs | 12.3 | [15] | 31.5 | [15] | 43.0 | [15] | (11.9) | [15]
Assets (excluding deferred tax assets) |  |  | (12.9) | [15] | (43.6) | [15] |  |
Reconciling items | Inventory |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gold inventory change | (5.3) | [16] | 0.1 | [16] | 1.3 | [16] | 4.5 | [16]
Assets (excluding deferred tax assets) |  |  | 15.4 | [16] | 15.7 | [16] |  |
Reconciling items | Impairment Of Agnew |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Assets (excluding deferred tax assets) |  |  | (52.8) | [17] | (51.5) | [17] |  |
Reconciling items | Interest Capitalization |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Other items as detailed in statement of operations |  |  | (3.1) | [13] |  |  | (5.2) | [13]
Assets (excluding deferred tax assets) |  |  | 84.2 | [13] | 91.8 | [13] |  |
Reconciling items | Inventory Stockpiles |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Gold inventory change | 0.6 | [18] |  |  | 0.1 | [18] | 1.4 | [18]
Assets (excluding deferred tax assets) |  |  | (1.2) | [18] | (1.2) | [18] |  |
Reconciling items | Amortization - discontinued operations [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Assets (excluding deferred tax assets) |  |  | (28.1) | [19] |  |  |  |
Reconciling items | Amortization Discontinued Operations |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Amortization and depreciation |  |  | (29.4) | [19] |  |  |  |
Reconciling items | Impairment of assets |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Other items as detailed in statement of operations |  |  | (7.5) | [5] |  |  |  |
Reconciling items | Other |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Other items as detailed in statement of operations | $ (1.4) |  | $ 0.6 |  | $ 0.6 |  | $ 9.6 |
[1] | Operating costs for management reporting purposes includes: Corporate expenditure - $46.6 million, Environmental rehabilitation - $28.2 million and Employee termination costs - $13.8 million, which are not included in production costs under U.S. GAAP. In addition, gold inventory change is included in production costs under U.S. GAAP.
[2] | Reflects the change in quantity and value of broken ore and ore on the heap leach pad during the fiscal year.
[3] | Exploration, feasibility and evaluation costs For management reporting purposes, exploration costs are capitalized from the date the drilling program confirms sufficient evidence of mineralization to proceed with a feasibility study. Under U.S. GAAP, exploration costs are capitalized from the date a bankable feasibility study is completed.
[4] | Provision for rehabilitation Revisions to the environmental rehabilitation obligation For management reporting purposes, all changes in the carrying amount of the obligation are recognized as an increase or decrease in the carrying amount of the associated capitalized retirement cost. Due to differences in the capitalized retirement cost between management reporting and U.S. GAAP, differences could arise. Changes resulting from revisions in the timing or amount of estimated cash flows are recognized as an increase or decrease in the carrying amount of the asset retirement obligation and the associated capitalized retirement cost for U.S. GAAP. In addition, the current discount rate is applied to measure the retirement obligation for management reporting purposes. Under U.S. GAAP any decreases in the asset retirement obligation as a result of downward revisions in cash flow estimates should be treated as a modification of an existing asset retirement obligation, and should be measured at the historical discount rate used to measure the initial asset retirement obligation. Amortization of rehabilitation asset For reasons discussed above, the rehabilitation asset's carrying value for management reporting purposes is different to that under U.S. GAAP, which results in a different amortization charge.
[5] | Business combination - formation of Original Gold Fields For management reporting purposes, the formation of Original Gold Fields was accounted for as a uniting-of-interests. Under U.S. GAAP, the Company accounted for the assets and liabilities acquired from Gold Fields of South Africa Limited at historical cost, and the assets and liabilities acquired from Gencor and outside shareholders as a purchase.
[6] | Business combination - formation of Gold Fields For management reporting purposes, the difference between the purchase price and net asset value of acquired assets that arose on this transaction was set-off against shareholders' equity. Under U.S. GAAP, the excess purchase price was capitalized to property, plant and equipment and is being amortized over its useful life.
[7] | Business combination - purchase of St. Ives and Agnew For management reporting purposes, traded equity securities issued as consideration in a business combination are valued on the date they are issued. Under U.S. GAAP, traded equity securities issued as consideration in a business combination are valued a few days before and after the terms of the transaction are announced.
[8] | Business combination - purchase of Abosso For management reporting purposes, traded equity securities issued as consideration in a business combination are valued on the date they are issued. Under U.S. GAAP, traded equity securities issued as consideration in a business combination are valued a few days before and after the terms of the transaction are announced.
[9] | Business combinations - purchase of South Deep For management reporting purposes, traded equity securities issued as consideration in a business combination are valued on the date they are issued. Under U.S. GAAP, traded equity securities issued as consideration in a business combination are valued a few days before and after the terms of the transaction are announced. For management reporting purposes, the entire interest acquired in South Deep was fair value upon gaining a controlling interest. Under U.S. GAAP, only the additional interest acquired was accounted for at fair value; assets acquired before obtaining control are stated at historical carrying amounts. In addition, U.S. GAAP requires retrospective equity accounting from the date the interest is acquired until the Group obtains control and the investment becomes a subsidiary. For management reporting purposes no retrospective equity accounting is applied. For management reporting purposes, any excess arising over the purchase price paid and the fair value of the net identifiable assets and liabilities acquired for additional interests in subsidiaries from minority shareholders are recorded directly in equity ('economic entity model'). Under U.S. GAAP, any excess over the purchased price paid and the fair value of the net identifiable assets and liabilities are recorded as goodwill ('parent company model').
[10] | Cut-backs For management reporting purposes, waste laybacks at surface operations are capitalized as mine development costs. Under U.S. GAAP, once the production phase of a mine has commenced, waste laybacks are considered variable production costs that should be included as a component of inventory to be recognized in Production costs exclusive of depreciation and amortization in the same period as the revenue from the sale of inventory. As a result, capitalization of waste laybacks is appropriate only to the extent product inventory exists at the end of a reporting period.
[11] | Amortization of reserves For management reporting purposes, a portion of ore resources at the Australian operations, based on the philosophy of "endowment", is used for calculating depreciation and amortization. Under U.S. GAAP, depreciation and amortization is calculated based upon existing proven and probable reserves.
[12] | Amortization - inclusion of future costs For management reporting purposes, future mine development costs are included in mining assets in calculating depreciation and amortization. Under U.S. GAAP, future development costs are not included in the calculation of depreciation and amortization.
[13] | Interest capitalization For management reporting purposes, borrowing costs are capitalized to the extent that qualifying assets are financed through specific debt financing or general outstanding debt not for any specific purpose other than funding the operations of the Group. Under U.S. GAAP, total outstanding debt financing is taken into account in calculating the amount of borrowing cost to be capitalized.
[14] | Investments in equity investees For management reporting purposes an equity investment exceeding a 20% shareholding was treated as an available-for-sale investment prior to fiscal 2003. Under U.S. GAAP this investment was accounted for under the equity method since acquisition.
[15] | Deferred stripping For management reporting purposes, the Company defers the waste stripping costs in excess of the expected average pitlife stripping ratio. Under U.S. GAAP, waste stripping costs are considered costs of the extracted minerals and recognized as a component of inventory to be recognized in production costs exclusive of depreciation and amortization in the same period as the revenue from the sale of inventory.
[16] | Inventory Under U.S. GAAP additional amortization, waste normalization and cut backs expensed are included in the cost of inventory produced. No such absorption of costs occurred for management reporting purposes. Additionally, for management reporting purposes, no adjustment is required to record inventory at net realizable value. Under U.S. GAAP, due to the impact of the amortization adjustments on the inventory valuation, an adjustment may be required to record inventory at the lower of cost and net realizable value.
[17] | Impairment of Agnew For management reporting purposes the Agnew mine was not determined to be impaired. Under U.S. GAAP the Agnew mine was determined to be impaired and an impairment charge was recognized.
[18] | Inventory stockpiles For management reporting purposes, previous impairment charges writing down stockpiles to net realizable values are reversed when the net realizable value rises above the original cost. Under U.S. GAAP, the net realizable value is deemed the new base cost and impairment charges are not reversed.
[19] | Amortization - discontinued operations For management reporting purposes, the Spin-off of Sibanye Gold was accounted for as discontinued operations in fiscal 2012 and the related assets and liabilities were classified as held for distribution. As a result, depreciation ceased due to the classification of the assets as held for distribution. Under U.S. GAAP, the Spin-off was not accounted for as discontinued operations in 2012 as the Sibanye Gold assets and liabilities continue to be classified as held for use until the Spin-off date. As a result, depreciation did not cease during fiscal 2012 and is charged until the Spin-off date.

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