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INCOME AND MINING TAXES - Components of Net Deferred Income and Mining Tax Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Total deferred income and mining tax liabilities |  |  |
Total deferred income and mining tax liabilities | $ 827,341 | $ 819,562 | $ 802,114
Mining Properties |  |  |
Total deferred income and mining tax liabilities |  |  |
Total deferred income and mining tax liabilities | 1,089,751 | 1,046,218 |
Net capital loss carry forwards |  |  |
Total deferred income and mining tax liabilities |  |  |
Total deferred income and mining tax liabilities | (97,946) | (80,227) |
Mining taxes |  |  |
Total deferred income and mining tax liabilities |  |  |
Total deferred income and mining tax liabilities | (75,238) | (76,344) |
Reclamation provisions and other labilities |  |  |
Total deferred income and mining tax liabilities |  |  |
Total deferred income and mining tax liabilities | $ (89,226) | $ (70,085) |

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