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SEGMENT INFORMATION (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2017 segment
Disclosure of operating segments [line items] |
Number of reportable segments | 2
Las Encinas |
Disclosure of operating segments [line items] |
Percentage of equity interest | 100.00%
Peña Colorada |
Disclosure of operating segments [line items] |
Proportion of ownership interest in subsidiary | 50.00%
Steel |
Disclosure of operating segments [line items] |
Number of operating segments | 3

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