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v3.20.1

MINING INTERESTS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Mining Interests |  |
Balance | $ 1,853.4 |
Balance | 1,928.0 | $ 1,853.4
Gross carrying amount [member] |  |
Mining Interests |  |
Balance | 2,948.9 | 4,351.3
Additions | 309.8 | 214.9
Disposals | (7.0) | (5.2)
Sale of Mesquite |  | (557.3)
Transfers | 0.0 | 0.0
Government Grants | (2.0) |
Asset impairment |  | (1,054.8)
Balance | 3,249.7 | 2,948.9
Accumulated depreciation and amortisation [member] |  |
Mining Interests |  |
Balance | 1,095.5 | 1,150.9
Depreciation for the year | 229.3 | 299.8
Disposals | (3.1) | (3.7)
Sale of Mesquite |  | (351.5)
Balance | 1,321.7 | 1,095.5
Depletable [Member] |  |
Mining Interests |  |
Balance | 545.7 |
Balance | 619.7 | 545.7
Depletable [Member] | Gross carrying amount [member] |  |
Mining Interests |  |
Balance | 1,262.7 | 2,353.0
Additions | 87.3 | 70.8
Disposals | (0.2) | (0.4)
Sale of Mesquite |  | (323.5)
Transfers | 101.3 | (0.6)
Government Grants | 0.0 |
Asset impairment |  | (836.6)
Balance | 1,451.1 | 1,262.7
Depletable [Member] | Accumulated depreciation and amortisation [member] |  |
Mining Interests |  |
Balance | 717.0 | 737.3
Depreciation for the year | 114.4 | 169.1
Disposals | 0.0 | (0.1)
Sale of Mesquite |  | (189.3)
Balance | 831.4 | 717.0
Non-depletable [Member] |  |
Mining Interests |  |
Balance | 367.6 |
Balance | 409.0 | 367.6
Non-depletable [Member] | Gross carrying amount [member] |  |
Mining Interests |  |
Balance | 367.6 | 562.0
Additions | 43.5 | 23.8
Disposals | (0.1) | 0.0
Sale of Mesquite |  | 0.0
Transfers | 0.0 | 0.0
Government Grants | (2.0) |
Asset impairment |  | (218.2)
Balance | 409.0 | 367.6
Non-depletable [Member] | Accumulated depreciation and amortisation [member] |  |
Mining Interests |  |
Balance | 0.0 | 0.0
Depreciation for the year | 0.0 | 0.0
Disposals | 0.0 | 0.0
Sale of Mesquite |  | 0.0
Balance | 0.0 | 0.0
Plant and Equipment [Member] |  |
Mining Interests |  |
Balance | 812.9 |
Balance | 769.9 | 812.9
Plant and Equipment [Member] | Gross carrying amount [member] |  |
Mining Interests |  |
Balance | 1,191.4 | 1,379.3
Additions | 75.5 | 48.3
Disposals | (6.7) | (4.8)
Sale of Mesquite |  | (232.0)
Transfers | 0.0 | 0.6
Government Grants | 0.0 |
Asset impairment |  | 0.0
Balance | 1,260.2 | 1,191.4
Plant and Equipment [Member] | Accumulated depreciation and amortisation [member] |  |
Mining Interests |  |
Balance | 378.5 | 413.6
Depreciation for the year | 114.9 | 130.7
Disposals | (3.1) | (3.6)
Sale of Mesquite |  | (162.2)
Balance | 490.3 | 378.5
Construction in Progress [Member] |  |
Mining Interests |  |
Balance | 127.2 |
Balance | 129.4 | 127.2
Construction in Progress [Member] | Gross carrying amount [member] |  |
Mining Interests |  |
Balance | 127.2 | 57.0
Additions | 103.5 | 72.0
Disposals | 0.0 | 0.0
Sale of Mesquite |  | (1.8)
Transfers | (101.3) | 0.0
Government Grants | 0.0 |
Asset impairment |  | 0.0
Balance | 129.4 | 127.2
Construction in Progress [Member] | Accumulated depreciation and amortisation [member] |  |
Mining Interests |  |
Balance | 0.0 | 0.0
Depreciation for the year | 0.0 | 0.0
Disposals | 0.0 | 0.0
Sale of Mesquite |  | 0.0
Balance | $ 0.0 | $ 0.0

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