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Non-Current Investments (Parenthetical) (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2010 | Dec. 31, 2012 Investment | Dec. 31, 2011 Investment | Jun. 30, 2010
Schedule of Investments [Line Items] |  |  |  |  |  |
Fair value |  | $ 36.2 | [1] | $ 77.3 | [1] |
Cost |  | 24.8 |  | 68.4 |  |
Net unrealized gain |  | 11.4 |  | 8.9 |  |
The net gain comprises: |  |  |  |  |  |
Gross unrealized gains |  | 11.7 |  | 15.2 |  |
Gross unrealized losses |  | (0.3) |  | (6.3) |  |
Net unrealized gain |  | 11.4 |  | 8.9 |  |
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: |  | 4 |  | 8 |  |
Realized gain reclassified from equity on disposal of listed investments ($ million) | (0.4) | 14.7 |  | 12.8 |  | 111.7
Far Southeast (FSE) Deposit |  |  |  |  |  |
The net gain comprises: |  |  |  |  |  |
Ownership % |  | 40.00% |  |  |  |
Market value of equity investment |  |  | [2] |  | [2] |
Description of business |  | Exploration |  |  |  |
Rusoro Mining Limited |  |  |  |  |  |
The net gain comprises: |  |  |  |  |  |
Ownership % |  | 26.40% |  | 26.40% |  |
Market value of equity investment |  | 6.3 |  | 13.1 |  |
Description of business |  | Gold mining |  |  |  |
Rand Refinery Limited |  |  |  |  |  |
The net gain comprises: |  |  |  |  |  |
Ownership % |  | 34.90% |  | 34.90% |  |
Market value of equity investment |  |  | [2] |  | [2] |
Description of business |  | Refining of gold bullion and by-products |  |  |  |
Timpetra Resources Limited |  |  |  |  |  |
The net gain comprises: |  |  |  |  |  |
Ownership % |  | 21.80% |  | 21.80% |  |
Market value of equity investment |  | $ 1.0 |  | $ 1.2 |  |
Description of business |  | Resource exploration |  |  |  |
Northam Platinum | Listed Investments |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Listed investments, Market value, $ per share |  | $ 4.55 |  | $ 3.75 |  |
Listed investments, Number of shares |  | 7,820,169 |  | 7,820,169 |  |
Radius Gold Incorporated | Listed Investments |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Listed investments, Market value, $ per share |  | $ 0.22 |  | $ 0.23 |  |
Listed investments, Number of shares |  | 3,625,124 |  | 3,625,124 |  |
Gran Columbia Gold Corporation | Listed Investments |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Listed investments, Market value, $ per share |  | $ 0.36 |  | $ 0.40 |  |
Listed investments, Number of shares |  | 1,585,274 |  | 1,585,274 |  |
Evolution Mining Limited | Listed Investments |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Listed investments, Market value, $ per share |  |  |  | $ 1.62 |  |
Listed investments, Number of shares |  |  |  | 15,535,016 |  |
GoldQuest Mining Corporation | Listed Investments |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Listed investments, Market value, $ per share |  |  |  | $ 0.08 |  |
Listed investments, Number of shares |  |  |  | 13,962,500 |  |
Atacama Pacific Gold Corporation | Listed Investments |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Listed investments, Market value, $ per share |  |  |  | $ 3.79 |  |
Listed investments, Number of shares |  |  |  | 4,945,598 |  |
[1] | Listed investments mainly consist of: December 31, 2012 December 31, 2011 Number of shares Market value, $ per share Number of shares Market value, $ per share Northam Platinum 7,820,169 4.55 7,820,169 3.75 Radius Gold Incorporated 3,625,124 0.22 3,625,124 0.23 Gran Columbia Gold Corporation 1,585,274 0.36 1,585,274 0.40 Evolution Mining Limited - - 15,535,016 1.62 GoldQuest Mining Corporation - - 13,962,500 0.08 Atacama Pacific Gold Corporation - - 4,945,598 3.79 Details of the listed investments are as follows: December 31, 2012 December 31, 2011 Fair value 36.2 77.3 Less: Cost 24.8 68.4 Net unrealized gain 11.4 8.9 The net gain comprises: Gross unrealized gains 11.7 15.2 Gross unrealized losses (0.3 ) (6.3 ) 11.4 8.9 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: 4 8 Realized gain reclassified from equity on disposal of listed investments ($ million) 14.7 12.8
[2] | Not readily determinable

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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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