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SEGMENTED INFORMATION (Details 1)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
CAD ($)
Disclosure of operating segments [line items]  
Total revenue commitments $ 86,489
2020  
Disclosure of operating segments [line items]  
Total revenue commitments 14,522
2021  
Disclosure of operating segments [line items]  
Total revenue commitments 11,408
2022  
Disclosure of operating segments [line items]  
Total revenue commitments 6,589
2023  
Disclosure of operating segments [line items]  
Total revenue commitments 6,589
2024  
Disclosure of operating segments [line items]  
Total revenue commitments 5,082
Thereafter  
Disclosure of operating segments [line items]  
Total revenue commitments 42,299
Mining | Toll milling services - APG Arrangement  
Disclosure of operating segments [line items]  
Total revenue commitments 65,199
Mining | Toll milling services - APG Arrangement | 2020  
Disclosure of operating segments [line items]  
Total revenue commitments 4,580
Mining | Toll milling services - APG Arrangement | 2021  
Disclosure of operating segments [line items]  
Total revenue commitments 4,580
Mining | Toll milling services - APG Arrangement | 2022  
Disclosure of operating segments [line items]  
Total revenue commitments 4,580
Mining | Toll milling services - APG Arrangement | 2023  
Disclosure of operating segments [line items]  
Total revenue commitments 4,580
Mining | Toll milling services - APG Arrangement | 2024  
Disclosure of operating segments [line items]  
Total revenue commitments 4,580
Mining | Toll milling services - APG Arrangement | Thereafter  
Disclosure of operating segments [line items]  
Total revenue commitments 42,299
Closed Mines Group | Environmental services  
Disclosure of operating segments [line items]  
Total revenue commitments 12,752
Closed Mines Group | Environmental services | 2020  
Disclosure of operating segments [line items]  
Total revenue commitments 7,933
Closed Mines Group | Environmental services | 2021  
Disclosure of operating segments [line items]  
Total revenue commitments 4,819
Closed Mines Group | Environmental services | 2022  
Disclosure of operating segments [line items]  
Total revenue commitments 0
Closed Mines Group | Environmental services | 2023  
Disclosure of operating segments [line items]  
Total revenue commitments 0
Closed Mines Group | Environmental services | 2024  
Disclosure of operating segments [line items]  
Total revenue commitments 0
Closed Mines Group | Environmental services | Thereafter  
Disclosure of operating segments [line items]  
Total revenue commitments 0
Corporate and Other | Management fees  
Disclosure of operating segments [line items]  
Total revenue commitments 8,538
Corporate and Other | Management fees | 2020  
Disclosure of operating segments [line items]  
Total revenue commitments 2,009
Corporate and Other | Management fees | 2021  
Disclosure of operating segments [line items]  
Total revenue commitments 2,009
Corporate and Other | Management fees | 2022  
Disclosure of operating segments [line items]  
Total revenue commitments 2,009
Corporate and Other | Management fees | 2023  
Disclosure of operating segments [line items]  
Total revenue commitments 2,009
Corporate and Other | Management fees | 2024  
Disclosure of operating segments [line items]  
Total revenue commitments 502
Corporate and Other | Management fees | Thereafter  
Disclosure of operating segments [line items]  
Total revenue commitments $ 0