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Non-Current Investments (Parenthetical) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Investment
Dec. 31, 2012
Investment
Dec. 31, 2011
Dec. 31, 2013
Far South East Project [Member]
Dec. 31, 2012
Far South East Project [Member]
Dec. 31, 2013
Rusoro Mining Limited
Dec. 31, 2012
Rusoro Mining Limited
Dec. 31, 2013
Rand Refinery Limited
Dec. 31, 2012
Rand Refinery Limited
Jan. 31, 2013
Bezant Resources Plc
Dec. 31, 2013
Bezant Resources Plc
Dec. 31, 2013
Timpetra Resource Limited
Dec. 31, 2012
Timpetra Resource Limited
Dec. 31, 2013
Listed Investments
Northam Platinum
Dec. 31, 2012
Listed Investments
Northam Platinum
Dec. 31, 2013
Listed Investments
Radius Gold Incorporated
Dec. 31, 2012
Listed Investments
Radius Gold Incorporated
Dec. 31, 2013
Listed Investments
Gran Columbia Gold Corporation
Dec. 31, 2012
Listed Investments
Gran Columbia Gold Corporation
Dec. 31, 2013
Listed Investments
Sibanye Gold
Dec. 31, 2012
Listed Investments
Sibanye Gold
Dec. 31, 2013
Listed Investments
Orsu Metals Corp.
Dec. 31, 2012
Listed Investments
Orsu Metals Corp.
Dec. 31, 2013
Listed Investments
Clancy Exploration Ltd.
Dec. 31, 2012
Listed Investments
Clancy Exploration Ltd.
Schedule of Investments [Line Items]                                                  
Listed investments, Market value, $ per share                              $ 4.55 $ 0.09 $ 0.22 $ 0.78 $ 0.36 $ 1.12    $ 0.05 $ 0.10 $ 0.01 $ 0.03
Listed investments, Number of shares                             7,820,169 3,625,124 3,625,124 63,410 1,585,274 856,330   26,134,919 1,134,919 17,764,783 3,479,069
Fair value $ 3.2 [1] $ 36.2 [1]                                              
Less: Cost 3.4 24.8                                              
Net unrealized (loss)/gain (0.2) 11.4                                              
Gross unrealized gains 0.2 11.7                                              
Gross unrealized losses (0.4) (0.3)                                              
Net unrealized (loss)/gain (0.2) 11.4                                              
The gross unrealized loss comprises the following number of equity instruments none of which have been in a continuous unrealized loss position for more than 12 months: 3 4                                              
Realized gain reclassified from equity on disposal of listed investments ($ million) 7.4 14.7 12.8                                            
Ownership %       40.00% 40.00% 26.40% 26.40% 2.80% 34.90%   21.60% [2] 1.80% [3] 21.80% [3]                        
Description of business       Exploration   Gold mining   Refining of gold bullion and by-products     Exploration [2] Resource exploration [3]                          
Market value of equity investment          [4]    [4] 3.3 6.3    [4]    [4]   5.1 [2] 0.1 [3] 1.0 [3]                        
Share purchased, percentage                   21.60%                              
Share purchased                   $ 7.5                              
Disposal of shares due to decrease in shareholding                       13,700,000                          
Number of shares previously held                       15,000,000                          
[1] Listed investments mainly consist of: December 31, 2013 December 31, 2012 Number of shares Market value, $ per share Number of shares Market value, $ per share Northam Platinum - - 7,820,169 4.55 Radius Gold Incorporated 3,625,124 0.09 3,625,124 0.22 Gran Columbia Gold Corporation 63,410 0.78 1,585,274 0.36 Sibanye Gold 856,330 1.12 - - Orsu Metals Corp. 26,134,919 0.05 1,134,919 0.10 Clancy Exploration Ltd. 17,764,783 0.01 3,479,069 0.03 Details of the listed investments are as follows: December 31, 2013 December 31, 2012 Fair value 3.2 36.2 Less: Cost 3.4 24.8 Net unrealized (loss)/gain (0.2 ) 11.4 The net (loss)/gain comprises: Gross unrealized gains 0.2 11.7 Gross unrealized losses (0.4 ) (0.3 ) (0.2 ) 11.4 The gross unrealized loss comprises the following number of equity instruments none of which have been in a continuous unrealized loss position for more than 12 months: 3 4 Realized gain reclassified from equity on disposal of listed investments ($ million) 7.4 14.7 Investments acquired during fiscal 2013 comprised mainly Clancy Exploration Limited and some unlisted investments (fiscal year ended December 31, 2012: Cascadero Copper Corporation and Atacama Pacific Gold Corporation). Investments disposed during fiscal 2013 comprised mainly Northam Platinum Limited and Timpetra Resources Limited (fiscal year ended December 31, 2012: Evolution Mining Limited, GoldQuest Mining Corporation and Atacama Pacific Gold Corporation). As a result of the disposal of investments, a realized gain on disposal of listed investments before tax of $7.4 million (2012: $14.7 million and 2011: $12.8 million) was reclassified out of accumulated other comprehensive income to net income and is included in profit on disposal of listed investments in the consolidated statement of operations.
[2] Gold Fields purchased a 21.6% shareholding in Bezant for $7.5 million in January 2013.
[3] During 2013, 13.7 million shares out of the 15 million previously held were disposed of and due to the decrease in shareholding, Timpetra Resources Limited is no longer equity accounted. The remaining investment was reclassified to listed investments.
[4] - Not readily determinable