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Financial Assets Measured at Fair Value by Level (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Assets:
Listed investments	$ 3.2	[1]	$ 36.2	[1]
Investments held by environmental trust funds			165.3
Unlisted investments	4.3		1.3
Trade receivable from provisional copper concentrate sales, net	58.2		149.9
Assets, Fair Value Disclosure, Total	65.7		352.7
Level 1
Assets:
Listed investments	3.2		36.2
Investments held by environmental trust funds			135.3
Unlisted investments
Trade receivable from provisional copper concentrate sales, net
Assets, Fair Value Disclosure, Total	3.2		171.5
Level 2
Assets:
Listed investments
Investments held by environmental trust funds			30.0
Unlisted investments
Trade receivable from provisional copper concentrate sales, net	58.2		149.9
Assets, Fair Value Disclosure, Total	58.2		179.9
Level 3
Assets:
Listed investments
Investments held by environmental trust funds
Unlisted investments	4.3		1.3
Trade receivable from provisional copper concentrate sales, net
Assets, Fair Value Disclosure, Total	$ 4.3		$ 1.3
[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.

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Provisional Copper Concentrate Sales, Fair Value Disclosure

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Investments in unlisted companies which are accounted for at directors' valuation adjusted for write-downs where appropriate.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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.

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The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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