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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Text Block [Abstract] |
Disclosure Of Property Plant And Equipment Useful Life Explanatory | The significant classes of depreciable plant and equipment and their estimated useful lives are as follows:
Asset Class |  | Estimated useful life (years)
Fixed plant & related components and infrastructure |  | Units-of-production over life of mine
Mobile equipment |  | 3-10 years

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