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RECEIVABLES (Narrative) (Details) $ in Thousands, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 10, 2018 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CAD ($)
Trade And Other Receivable [Line Items] |  |  |  |
Distributions from investments, net |  | $ 4,952 |  | $ 84,247
Change in value through profit or loss assets related to Akarca receivable balance |  | 0 |  | $ 109
IG Copper, LLC [Member] |  |  |  |
Trade And Other Receivable [Line Items] |  |  |  |
Distributions from investments, net | $ 84,247 | $ 4,952 | $ 3,743 |

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