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Financial Assets and Liabilities Measured at Fair Value by Level (Detail) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Assets:
Listed investments	[1]	$ 7.8	$ 4.4
Trade receivable from provisional copper concentrate sales, net		3.1	29.5
Assets, Fair Value Disclosure, Total		10.9	33.9
Energy Related Derivative
Liabilities:
Oil derivative contracts		1.5	10.3
Level 1
Assets:
Listed investments		7.8	4.4
Assets, Fair Value Disclosure, Total		7.8	4.4
Level 2
Assets:
Trade receivable from provisional copper concentrate sales, net		3.1	29.5
Assets, Fair Value Disclosure, Total		3.1	29.5
Level 2 | Energy Related Derivative
Liabilities:
Oil derivative contracts		$ 1.5	$ 10.3
[1] Listed investments consist mainly of: December 31, 2015 December 31, 2014 Number of shares Market value, $ per share Number of shares Market value, $ per share Radius Gold Incorporated 3,625,124 0.05 3,625,124 0.07 Gran Columbia Gold Corporation 63,410 0.11 63,410 0.34 Sibanye Gold 856,330 1.59 856,330 1.92 Orsu Metals Corp. 26,134,919 0.01 26,134,919 0.02 Clancy Exploration Ltd. 17,764,783 0.01 17,764,783 0.01 Tocqueville Bullion Reserve Ltd. 1,339 1,043.64 1,339 1,178.73 Hummingbird Resources 21,258,503 0.19 - - Details of the listed investments are as follows: December 31, 2015 December 31, 2014 Fair value 7.8 4.4 Less: Cost 6.9 3.9 Net unrealized gain 0.9 0.5 The net gain comprises: Gross unrealized gains 1.1 0.7 Gross unrealized losses (0.2 ) (0.2 ) 0.9 0.5 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 2 3 Realized gain reclassified from equity on disposal of listed investments ($ million) - 1.8 Investments acquired during fiscal 2015 comprised Consolidated Woodjam Copper Corporation. The investment comprised of 12,285,463 shares, which were acquired for $0.4 million. No investments were disposed during fiscal 2015. As a result of the disposal of investments, a realized gain on disposal of listed investments before tax of $nil million (fiscal 2014: $1.8 million) was reclassified out of accumulated other comprehensive income to net income and is included in profit on disposal of investments and subsidiaries in the consolidated statement of operations.

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Provisional Copper Concentrate Sales, Fair Value Disclosure

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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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-Publisher FASB
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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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