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SEGMENTED INFORMATION - Geographic (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Revenue And Other Non Current Assets By Geographic |  |
Revenues from Mining Operations | $ 2,242,604 | $ 2,138,232
Total non-current assets | 6,404,067 | 5,877,772
Canada |  |
Revenue And Other Non Current Assets By Geographic |  |
Revenues from Mining Operations | 1,542,191 | 1,386,013
Total non-current assets | 4,452,478 | 3,970,435
Mexico |  |
Revenue And Other Non Current Assets By Geographic |  |
Revenues from Mining Operations | 451,652 | 499,873
Total non-current assets | 1,026,740 | 1,010,063
Finland |  |
Revenue And Other Non Current Assets By Geographic |  |
Revenues from Mining Operations | 248,761 | 252,346
Total non-current assets | 900,831 | 873,220
Sweden |  |
Revenue And Other Non Current Assets By Geographic |  |
Total non-current assets | 13,812 | 13,812
United States |  |
Revenue And Other Non Current Assets By Geographic |  |
Total non-current assets | $ 10,206 | $ 10,242

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