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Contingent Liabilities - Additional Information (Detail) (ZAR) In Millions, unless otherwise specified | Mar. 31, 2008 Randgold and Exploration Summons | Dec. 31, 2010 South Deep Gold Mine
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Commitments and Contingencies Disclosure [Line Items] |  |
Randgold and Exploration summons, highest claims | 12,000 |
Randgold and Exploration summons, lowest claims | 11,000 |
Randgold and Exploration summons, alternative claims | 519 |
GFO interest in the South Deep Mine |  | 50.00%

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