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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Plant and Equipment (Details) | 12 Months Ended
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Dec. 31, 2017
Mining Properties | Minimum |
Plant and Equipment |
Useful Life (in years) | 1 year
Mining Properties | Maximum |
Plant and Equipment |
Useful Life (in years) | 17 years
Building | Minimum |
Plant and Equipment |
Useful Life (in years) | 5 years
Building | Maximum |
Plant and Equipment |
Useful Life (in years) | 30 years
Leasehold Improvements |
Plant and Equipment |
Useful Life (in years) | 15 years
Software and IT Equipment | Minimum |
Plant and Equipment |
Useful Life (in years) | 1 year
Software and IT Equipment | Maximum |
Plant and Equipment |
Useful Life (in years) | 10 years
Furniture and Office Equipment | Minimum |
Plant and Equipment |
Useful Life (in years) | 3 years
Furniture and Office Equipment | Maximum |
Plant and Equipment |
Useful Life (in years) | 5 years
Machinery and Equipment | Minimum |
Plant and Equipment |
Useful Life (in years) | 1 year
Machinery and Equipment | Maximum |
Plant and Equipment |
Useful Life (in years) | 26 years

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- Definition The useful lives used for property, plant and equipment based on the lesser of the estimated mine lives and the useful life of the asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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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