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v3.19.1

FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Long-term debts [Member] |  |  |
FINANCIAL LIABILITIES |  |  |
Financial liabilities, at fair value |  | $ 652.9 | $ 1,064.3
Gold stream obligation [Member] |  |  |
FINANCIAL LIABILITIES |  |  |
Financial liabilities, at fair value |  | 182.4 | 273.5
Cash and cash equivalent [Member] |  |  |
FINANCIAL ASSETS |  |  |
Financial assets, at fair value |  | 103.7 | 216.2
Trade and other receivables [Member] |  |  |
FINANCIAL ASSETS |  |  |
Financial assets, at fair value |  | 36.6 | 29.0
Investment [Member] |  |  |
FINANCIAL ASSETS |  |  |
Financial assets, at fair value |  | 0.8 | 1.0
Proceeds due from income tax refunds at Mesquite [Member] |  |  |
FINANCIAL ASSETS |  |  |
Financial assets, at fair value | [1] | 8.5 | 0.0
Financial liabilities at amortised cost, category [member] | Long-term debts [Member] |  |  |
FINANCIAL LIABILITIES |  |  |
Financial liabilities, at fair value |  | 780.5 | 1,007.7
Financial liabilities at amortised cost, category [member] | Trade and other receivables [Member] |  |  |
FINANCIAL LIABILITIES |  |  |
Financial liabilities, at fair value | [2] | 101.3 | 146.0
Financial liabilities at fair value through profit or loss, category [member] | Level 2 of fair value hierarchy [member] | Gold price option contracts [Member] |  |  |
FINANCIAL LIABILITIES |  |  |
Financial liabilities, at fair value |  | 4.8 | 0.0
Financial liabilities at fair value through profit or loss, category [member] | Level 2 of fair value hierarchy [member] | Copper price option contracts [Member] |  |  |
FINANCIAL LIABILITIES |  |  |
Financial liabilities, at fair value |  | 0.0 | 4.1
Financial liabilities at fair value through profit or loss, category [member] | Level 1 of fair value hierarchy [member] | Restricted share units [Member] |  |  |
FINANCIAL LIABILITIES |  |  |
Financial liabilities, at fair value |  | 0.3 | 0.8
Financial liabilities at fair value through profit or loss, category [member] | Level 3 of fair value hierarchy [member] | Gold stream obligation [Member] |  |  |
FINANCIAL LIABILITIES |  |  |
Financial liabilities, at fair value |  | 182.4 | 273.5
Financial liabilities at fair value through profit or loss, category [member] | Level 3 of fair value hierarchy [member] | Perfomance share units [Member] |  |  |
FINANCIAL LIABILITIES |  |  |
Financial liabilities, at fair value |  | 0.2 | 1.8
Financial assets at amortised cost, category [member] | Cash and cash equivalent [Member] |  |  |
FINANCIAL ASSETS |  |  |
Financial assets, at fair value |  | 103.7 | 216.2
Financial assets at amortised cost, category [member] | Trade and other receivables [Member] |  |  |
FINANCIAL ASSETS |  |  |
Financial assets, at fair value |  | 36.6 | 29.0
Financial assets at fair value through profit or loss, category [member] | Level 2 of fair value hierarchy [member] | Provisionally priced contracts [Member] |  |  |
FINANCIAL ASSETS |  |  |
Financial assets, at fair value |  | (1.6) | 4.2
Financial assets at fair value through profit or loss, category [member] | Level 2 of fair value hierarchy [member] | Gold and copper swap contracts [Member] |  |  |
FINANCIAL ASSETS |  |  |
Financial assets, at fair value |  | 0.9 | (6.1)
Financial assets at fair value through profit or loss, category [member] | Level 2 of fair value hierarchy [member] | Copper price option contracts [Member] |  |  |
FINANCIAL ASSETS |  |  |
Financial assets, at fair value |  | 0.7 | 0.0
Financial assets at fair value through profit or loss, category [member] | Level 1 of fair value hierarchy [member] | Investment [Member] |  |  |
FINANCIAL ASSETS |  |  |
Financial assets, at fair value |  | 0.8 | 1.0
Financial assets at fair value through profit or loss, category [member] | Level 3 of fair value hierarchy [member] | Proceeds due from income tax refunds at Mesquite [Member] |  |  |
FINANCIAL ASSETS |  |  |
Financial assets, at fair value | [1] | $ 8.5 | $ 0.0
[1] | Proceeds due from income tax refunds at Mesquite are included in other non-current assets on the consolidated statement of financial position.
[2] | Trade and other payables exclude the short-term portion of reclamation and closure cost obligations and the short-term portion of the gold stream obligation.

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