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Non-Current Investments (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
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