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Non-Current Investments (Parenthetical) (Detail) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) Investment $ / shares shares | Dec. 31, 2015 USD ($) Investment $ / shares shares | Dec. 31, 2014 USD ($) Investment $ / shares shares | Jul. 01, 2015
Investment Holdings [Line Items] |  |  |  |  |  |  |
Fair value | [1] | $ 7.8 | $ 7.8 |  | $ 4.4 |  |
Less: Cost |  | 6.9 | 6.9 |  | 3.9 |  |
Net unrealized gain |  | 0.9 | 0.9 |  | 0.5 |  |
Gross unrealized gains |  | 1.1 | 1.1 |  | 0.7 |  |
Gross unrealized losses |  | (0.2) | (0.2) |  | (0.2) |  |
Net unrealized gain |  | $ 0.9 | $ 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 | Investment |  | 2 | 2 |  | 3 |  |
Realized gain reclassified from equity on disposal of listed investments |  |  | $ 0.0 |  | $ 1.8 |  |
Impairment of investment in equity investee |  |  | $ 109.5 |  | $ 7.4 |  |
Radius Gold Incorporated |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Listed investments, Market value, $ per share | $ / shares |  | $ 0.05 | $ 0.05 |  | $ 0.07 |  |
Investments of shares | shares |  | 3,625,124 | 3,625,124 |  | 3,625,124 |  |
Gran Columbia Gold Corporation |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Listed investments, Market value, $ per share | $ / shares |  | $ 0.11 | $ 0.11 |  | $ 0.34 |  |
Investments of shares | shares |  | 63,410 | 63,410 |  | 63,410 |  |
Sibanye Gold Limited [Member] |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Listed investments, Market value, $ per share | $ / shares |  | $ 1.59 | $ 1.59 |  | $ 1.92 |  |
Investments of shares | shares |  | 856,330 | 856,330 |  | 856,330 |  |
Orsu Metals Corp. |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Listed investments, Market value, $ per share | $ / shares |  | $ 0.01 | $ 0.01 |  | $ 0.02 |  |
Investments of shares | shares |  | 26,134,919 | 26,134,919 |  | 26,134,919 |  |
Clancy Exploration Ltd. |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Listed investments, Market value, $ per share | $ / shares |  | $ 0.01 | $ 0.01 |  | $ 0.01 |  |
Investments of shares | shares |  | 17,764,783 | 17,764,783 |  | 17,764,783 |  |
Tocqueville Bullion Reserve Ltd [Member] |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Listed investments, Market value, $ per share | $ / shares |  | $ 1,043.64 | $ 1,043.64 |  | $ 1,178.73 |  |
Investments of shares | shares |  | 1,339 | 1,339 |  | 1,339 |  |
Woodjam Copper Corporation [Member] |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Investments of shares | shares |  | 12,285,463 | 12,285,463 |  |  |  |
Investment acquired |  | $ 0.4 | $ 0.4 |  |  |  |
Hummingbird |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Listed investments, Market value, $ per share | $ / shares |  | $ 0.19 | $ 0.19 |  |  |  |
Investments of shares | shares |  | 21,258,503 | 21,258,503 |  |  |  |
Bezant Resources Plc |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Ownership % | [2] | 21.60% | 21.60% |  | 21.60% |  |
Description of business | [2] |  | Exploration |  |  |  |
Market value of equity investment | [2] | $ 0.5 | $ 0.5 |  | $ 1.3 |  |
Impairment of investment in equity investee |  |  | $ 0.6 |  | $ 7.4 |  |
Hummingbird Resources Plc |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Ownership % |  |  |  |  | 25.10% | [3] | 25.10%
Description of business | [3] |  | Exploration |  |  |  |
Market value of equity investment | [3] |  |  |  | $ 10.9 |  |
Far South East Project [Member] |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Ownership % |  | 40.00% | 40.00% |  | 40.00% |  |
Description of business |  |  | Exploration |  |  |  |
Market value of equity investment |  | $ 128.6 | $ 128.6 |  |  | [4] |
Impairment of investment in equity investee |  | $ 101.4 | $ 101.4 | [5] |  |  |
Rusoro Mining Limited |  |  |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |  |  |
Ownership % |  | 26.40% | 26.40% |  | 26.40% |  |
Description of business |  |  | Gold mining |  |  |  |
Market value of equity investment |  | $ 5.0 | $ 5.0 |  | $ 1.8 |  |
[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.
[2] | During fiscal 2014, the investment in Bezant Resources Plc was impaired by $7.4 million to its fair value, as determined by its quoted market price. This impairment is considered other than temporary as the carrying value has been below the fair value for an extended period of time.
[3] | During fiscal 2014, Gold Fields acquired a 25.1% interest in Hummingbird Resources Plc (Refer note 3(c) for further details).
[4] | - Not readily determinable.
[5] | Following the identification of impairment indicators at December 31, 2015, the carrying value of FSE was impaired to its fair value which resulted in an impairment of $101.4 million. The fair value was indirectly derived from the market value of Lepanto Consolidated Mining Company, being the 60% shareholder of FSE.

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