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Non-Current Investments (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Schedule of Investments [Line Items] |  |  |  |
Listed investments | $ 36.2 | [1] | $ 77.3 | [1]
Unlisted investments | 1.3 |  | 2.6 |
Investments held by environmental trust funds | 165.3 | [2] | 161.5 | [2]
Equity investees | 254.4 | [3] | 28.2 | [3]
Other investments | 0.8 |  | 2.6 |
Non-current investments | $ 458.0 |  | $ 272.2 |
[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] | The environmental trust funds are irrevocable trusts under the Group's control. The monies in the trusts are invested primarily in interest bearing short-term (money market), government and other corporate bond investments and the costs of these investments approximate their fair value. The investments provide for the estimated cost of rehabilitation during and at the end of the life of the Group's South African mines. While the asset is under the Group's control, it is not available for the general purposes of the Group. All income from this asset is reinvested or spent to meet these obligations. These obligations are described in note 15, "Provision for Environmental Rehabilitation".
[3] | Equity investees comprise the following: Ownership % Market value Investment Description of business December 31, 2012 December 31, 2011 December 31, 2012 December 31, 2011 Far South East Exploration 40.0 - * * Rusoro Mining Limited Gold mining 26.4 26.4 6.3 13.1 Rand Refinery Limited Refining of gold bullion and by-products 34.9 34.9 * * Timpetra Resources Limited Resource exploration 21.8 21.8 1.0 1.2

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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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- Definition Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 + Details
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