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SEGMENTED INFORMATION - Information about major customers (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
SEGMENTED INFORMATION |  |
Revenue | $ 630.6 | $ 604.5
Customer [Member] |  |
SEGMENTED INFORMATION |  |
Revenue | 558.2 | 490.7
Rainy River |  |
SEGMENTED INFORMATION |  |
Revenue | 358.9 | 274.4
Rainy River | Customers one [Member] |  |
SEGMENTED INFORMATION |  |
Revenue | 128.9 | 137.9
Rainy River | Customers two [Member] |  |
SEGMENTED INFORMATION |  |
Revenue | 126.7 | 78.0
Rainy River | Customers three [Member] |  |
SEGMENTED INFORMATION |  |
Revenue | 102.5 |
New Afton |  |
SEGMENTED INFORMATION |  |
Revenue | 271.7 | 314.1
New Afton | Customers one [Member] |  |
SEGMENTED INFORMATION |  |
Revenue | 100.9 | 109.9
New Afton | Customers two [Member] |  |
SEGMENTED INFORMATION |  |
Revenue | $ 99.2 | 94.2
New Afton | Customers three [Member] |  |
SEGMENTED INFORMATION |  |
Revenue |  | $ 70.7

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