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SEGMENTED INFORMATION (Details 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Segmented information [Line Items] |  |  |
Revenue |  | $ 604.5 | $ 388.7
Customers [Member] |  |  |
Segmented information [Line Items] |  |  |
Revenue | [1] | 490.7 | 264.0
Rainy River [Member] |  |  |
Segmented information [Line Items] |  |  |
Revenue | [2] | 274.4 | 34.3
Rainy River [Member] | Customers one [Member] |  |  |
Segmented information [Line Items] |  |  |
Revenue |  | 137.9 |
Rainy River [Member] | Customers two [Member] |  |  |
Segmented information [Line Items] |  |  |
Revenue |  | 78.0 |
Cerro San Pedro [Member] |  |  |
Segmented information [Line Items] |  |  |
Revenue | [2] | 16.0 | 52.4
Cerro San Pedro [Member] | Customers one [Member] |  |  |
Segmented information [Line Items] |  |  |
Revenue | [3] |  | 4.4
New Afton [Member] |  |  |
Segmented information [Line Items] |  |  |
Revenue | [2] | 314.1 | 302.0
New Afton [Member] | Customers one [Member] |  |  |
Segmented information [Line Items] |  |  |
Revenue |  | 109.9 | 125.5
New Afton [Member] | Customers two [Member] |  |  |
Segmented information [Line Items] |  |  |
Revenue |  | 94.2 | $ 99.8
New Afton [Member] | Customers three [Member] |  |  |
Segmented information [Line Items] |  |  |
Revenue |  | $ 70.7 |
[1] | Amounts presented exclude sales generated from Peak Mines and Mesquite, which have been classified as discontinued operations.
[2] | Segmented revenue reported above represents revenue generated from external customers. There were no inter-segment sales in the year ended December 31, 2017.
[3] | For the year ended December 31, 2017, Rainy River and Cerro San Pedro sold to the same customer.

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