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EQUITY - Common Shares (Details) - $ / shares | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
EQUITY |  |  |
Common stock, par value (in dollars per share) |  | $ 0 |
Common stock, shares issued |  | 232,793,335 | 225,465,654
Common shares held in trust |  | 542,894 | 500,514
RSU |  |  |
EQUITY |  |  |
Common shares held in trust |  | 360,381 | 369,972
RSU | Maximum |  |  |
EQUITY |  |  |
Vesting period |  | 3 years |
PSU |  |  |
EQUITY |  |  |
Common shares held in trust |  | 176,333 | 124,500
Vesting period |  | 3 years |
LTIP | Minimum |  |  |
EQUITY |  |  |
Vesting period | 18 months |  |
LTIP | Maximum |  |  |
EQUITY |  |  |
Vesting period | 36 months |  |
LTIP | Partnership and Canadian Malartic Corporation |  |  |
EQUITY |  |  |
Percentage of deferred cash | 50.00% |  |
Percentage of asset comprised of common shares | 25.00% |  |
LTIP | Canadian Malartic Corporation |  |  |
EQUITY |  |  |
Common shares held in trust |  | 6,180 | 6,042
LTIP | Yamana |  |  |
EQUITY |  |  |
Percentage of asset comprised of common shares | 25.00% |  |

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