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SEGMENTED INFORMATION (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]    
Revenues $ 15,549 $ 15,550
Expenses:    
Operating expenses (14,436) (15,579)
Exploration and evaluation (15,238) (15,457)
General and administrative (7,811) (7,189)
Impairment reversal (expense) 0 (6,086)
Total expenses (37,485) (44,311)
Segment income (loss) (21,936) (28,761)
Revenues - supplemental:    
Environmental services 8,974 9,298
Management fees 1,966 2,013
Toll milling services 0  
Toll milling services - deferred revenue (note 13) 4,609 4,239
Revenues 15,549 15,550
Capital additions:    
Property, plant and equipment 948 19,096
Long-lived assets:    
Plant and equipment - Cost 105,493 103,430
Plant and equipment - Accumulated depreciation (27,715) (24,086)
Mineral properties 179,481 178,947
Property, plant and equipment 257,259 258,291
Mining    
Disclosure of operating segments [line items]    
Revenues 4,609 4,239
Expenses:    
Operating expenses (6,090) (7,159)
Exploration and evaluation (15,238) (15,457)
General and administrative (17) (17)
Impairment reversal (expense) 0 (6,086)
Total expenses (21,345) (28,719)
Segment income (loss) (16,736) (24,480)
Revenues - supplemental:    
Environmental services 0 0
Management fees 0 0
Toll milling services 0  
Toll milling services - deferred revenue (note 13) 4,609 4,239
Revenues 4,609 4,239
Capital additions:    
Property, plant and equipment 637 19,001
Long-lived assets:    
Plant and equipment - Cost 99,994 98,737
Plant and equipment - Accumulated depreciation (24,349) (20,982)
Mineral properties 179,481 178,947
Property, plant and equipment 255,126 256,702
Closed Mines Group    
Disclosure of operating segments [line items]    
Revenues 8,974 9,298
Expenses:    
Operating expenses (8,346) (8,211)
Exploration and evaluation 0 0
General and administrative 0 0
Impairment reversal (expense) 0 0
Total expenses (8,346) (8,211)
Segment income (loss) 628 1,087
Revenues - supplemental:    
Environmental services 8,974 9,298
Management fees 0 0
Toll milling services 0  
Toll milling services - deferred revenue (note 13) 0 0
Revenues 8,974 9,298
Capital additions:    
Property, plant and equipment 273 95
Long-lived assets:    
Plant and equipment - Cost 4,591 4,399
Plant and equipment - Accumulated depreciation (3,062) (2,927)
Mineral properties 0 0
Property, plant and equipment 1,529 1,472
Corporate and Other    
Disclosure of operating segments [line items]    
Revenues 1,966 2,013
Expenses:    
Operating expenses 0 (209)
Exploration and evaluation 0 0
General and administrative (7,794) (7,172)
Impairment reversal (expense) 0 0
Total expenses (7,794) (7,381)
Segment income (loss) (5,828) (5,368)
Revenues - supplemental:    
Environmental services 0 0
Management fees 1,966 2,013
Toll milling services 0  
Toll milling services - deferred revenue (note 13) 0 0
Revenues 1,966 2,013
Capital additions:    
Property, plant and equipment 38 0
Long-lived assets:    
Plant and equipment - Cost 908 294
Plant and equipment - Accumulated depreciation (304) (177)
Mineral properties 0 0
Property, plant and equipment $ 604 $ 117