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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Property, plant and equipment (Details) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 14, 2018 item | Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Oct. 02, 2018 | Mar. 19, 2018
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | $ 4,887.2 |  |  |
Impairment, net of reversals |  |  | $ (21.5) |  |
Capitalized interest |  | 41.5 | 25.1 |  |
Balance, end of period |  | 5,519.1 | 4,887.2 |  |
Amount included above as at December 31, 2016: |  |  |  |  |
Assets under construction |  | 783.5 | 650.6 |  |
Assets not being depreciated |  | $ 1,316.8 | $ 1,081.6 |  |
Capitalized interest, weighted average borrowing rate |  | 5.62% | 5.54% |  |
Bald Mountain Exploration LLC |  |  |  |  |
Amount included above as at December 31, 2016: |  |  |  |  |
Percentage of equity interest acquired |  |  |  | 50.00% |
Brazil |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | $ 1,383.1 |  |  |
Balance, end of period |  | $ 1,585.5 | $ 1,383.1 |  |
Phase 7 concessions | Compania Minera Mantos de Oro ("MDO") |  |  |  |  |
Amount included above as at December 31, 2016: |  |  |  |  |
Percentage of equity interest acquired |  | 50.00% |  |  | 50.00%
Subsidiary of Gerdau SA | Brazil | Bald Mountain Exploration LLC |  |  |  |  |
Amount included above as at December 31, 2016: |  |  |  |  |
Number of hydroelectric power plants acquired | item |  | 2 |  |  |
Subsidiary of Gerdau SA | Brazil | Kinross Brasil Mineracao S.A. ("KBM") |  |  |  |  |
Amount included above as at December 31, 2016: |  |  |  |  |
Number of hydroelectric power plants acquired | item | 2 |  |  |  |
Bald Mountain Exploration LLC | Bald Mountain Exploration LLC |  |  |  |  |
Amount included above as at December 31, 2016: |  |  |  |  |
Percentage of equity interest acquired |  | 50.00% |  |  |
Bald Mountain Exploration LLC | KG Mining (Bald Mountain) Inc. |  |  |  |  |
Amount included above as at December 31, 2016: |  |  |  |  |
Percentage of equity interest acquired |  |  |  | 50.00% |
Cost |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | $ 16,701.7 | 15,925.8 |  |
Additions |  | 1,086.5 | 925.4 |  |
Acquisitions |  | 339.9 |  |  |
Capitalized interest |  | 41.5 | 25.1 |  |
Disposals |  | (157.7) | (177.7) |  |
Other |  | 2.3 | 3.1 |  |
Balance, end of period |  | 18,014.2 | 16,701.7 |  |
Accumulated depreciation, depletion, amortization |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | (11,814.5) |  |  |
Depreciation, depletion and amortization |  | (825.5) |  |  |
Disposals |  | 146.4 |  |  |
Other |  | (1.5) |  |  |
Balance, end of period |  | (12,495.1) | (11,814.5) |  |
Accumulated depreciation, depletion, amortization and impairment |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | (11,814.5) | (11,008.2) |  |
Depreciation, depletion and amortization |  |  | (900.8) |  |
Impairment, net of reversals |  |  | (21.5) |  |
Disposals |  |  | 118.0 |  |
Other |  |  | (2.0) |  |
Balance, end of period |  |  | (11,814.5) |  |
Land, plant and equipment |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | 3,066.3 |  |  |
Balance, end of period |  | 3,482.1 | 3,066.3 |  |
Amount included above as at December 31, 2016: |  |  |  |  |
Assets under construction |  | 495.0 | 534.2 |  |
Assets not being depreciated |  | 719.1 | 723.3 |  |
Land, plant and equipment | Cost |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | 8,374.7 | 7,791.3 |  |
Additions |  | 629.4 | 626.9 |  |
Acquisitions |  | 274.8 |  |  |
Capitalized interest |  | 23.8 | 13.8 |  |
Disposals |  | (115.7) | (44.5) |  |
Other |  | (2.8) | (12.8) |  |
Balance, end of period |  | 9,184.2 | 8,374.7 |  |
Land, plant and equipment | Accumulated depreciation, depletion, amortization |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | (5,308.4) |  |  |
Depreciation, depletion and amortization |  | (508.5) |  |  |
Disposals |  | 106.5 |  |  |
Other |  | 8.3 |  |  |
Balance, end of period |  | (5,702.1) | (5,308.4) |  |
Land, plant and equipment | Accumulated depreciation, depletion, amortization and impairment |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | (5,308.4) | (5,076.4) |  |
Depreciation, depletion and amortization |  |  | (529.3) |  |
Impairment, net of reversals |  |  | 260.9 |  |
Disposals |  |  | 38.8 |  |
Other |  |  | (2.4) |  |
Balance, end of period |  |  | (5,308.4) |  |
Development and operating properties |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | 1,805.4 |  |  |
Balance, end of period |  | 2,023.6 | 1,805.4 |  |
Amount included above as at December 31, 2016: |  |  |  |  |
Assets under construction |  | 288.5 | 116.4 |  |
Assets not being depreciated |  | 584.3 | 342.8 |  |
Development and operating properties | Cost |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | 8,311.5 | 7,970.2 |  |
Additions |  | 457.1 | 298.5 |  |
Acquisitions |  | 65.1 |  |  |
Capitalized interest |  | 17.7 | 11.3 |  |
Disposals |  | (39.9) |  |  |
Other |  | 5.1 | 31.5 |  |
Balance, end of period |  | 8,816.6 | 8,311.5 |  |
Development and operating properties | Accumulated depreciation, depletion, amortization |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | (6,506.1) |  |  |
Depreciation, depletion and amortization |  | (317.0) |  |  |
Disposals |  | 39.9 |  |  |
Other |  | (9.8) |  |  |
Balance, end of period |  | (6,793.0) | (6,506.1) |  |
Development and operating properties | Accumulated depreciation, depletion, amortization and impairment |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | (6,506.1) | (5,852.4) |  |
Depreciation, depletion and amortization |  |  | (371.5) |  |
Impairment, net of reversals |  |  | (282.4) |  |
Other |  |  | 0.2 |  |
Balance, end of period |  |  | (6,506.1) |  |
Pre-development properties |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | 15.5 |  |  |
Balance, end of period |  | 13.4 | 15.5 |  |
Amount included above as at December 31, 2016: |  |  |  |  |
Assets not being depreciated |  | 13.4 | 15.5 |  |
Pre-development properties | Cost |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | 15.5 | 164.3 |  |
Disposals |  | (2.1) | (133.2) |  |
Other |  |  | (15.6) |  |
Balance, end of period |  | 13.4 | 15.5 |  |
Pre-development properties | Accumulated depreciation, depletion, amortization and impairment |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  |  | (79.4) |  |
Disposals |  |  | 79.2 |  |
Other |  |  | 0.2 |  |
Exploration and evaluation assets |  |  |  |  |
Property, plant and equipment |  |  |  |  |
Balance, beginning of period |  | 164.4 |  |  |
Acquisitions |  | 65.1 | 0.0 |  |
Transferred to capitalized development |  | 0.0 | 0.2 |  |
Disposals |  | (2.0) | (54.1) |  |
Balance, end of period |  | 230.7 | 164.4 |  |
Amount included above as at December 31, 2016: |  |  |  |  |
Exploration and evaluation expenses, capitalised |  | 3.1 | 1.9 |  |
Exploration and evaluation expenses |  | $ 11.5 | $ 6.7 |  |

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