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SIGNIFICANT ACCOUNTING POLICIES - Estimated Useful Lives of Major Asset Categories (Details) | 12 Months Ended
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Dec. 31, 2017
Minimum | Buildings, plant and equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | 7 years
Minimum | Underground mobile equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | 5 years
Minimum | Light vehicles and other mobile equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | 2 years
Minimum | Furniture, computer and office equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | 2 years
Maximum | Buildings, plant and equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | 27 years
Maximum | Underground mobile equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | 7 years
Maximum | Light vehicles and other mobile equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | 3 years
Maximum | Furniture, computer and office equipment |
Disclosure of detailed information about property, plant and equipment [line items] |
Useful life | 3 years

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- Definition Useful Lives Or Depreciation Rates, Property, Plant And Equipment, Period + References No definition available. + Details
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Balance Type: | na
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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- Details
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- Details
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- Details
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Period Type: |