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EXPLORATION AND EVALUATION ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Beginning balance $ 46,781 $ 43,338
Mine and camp costs 2,537 3,143
Provision for reclamation 1,338  
Effect of movements in exchange rates 1,280 (2,528)
Drilling and exploration 2,383 1,488
Depreciation of plant and equipment 317 540
Interest and financing costs 325 414
Geological and related services 116 205
Water treatment and tailing storage facility costs 112 53
Assessments and taxes 121 115
Assays 130 13
Disposition of Bralorne Mine (45,613)  
Ending balance 9,827 46,781
Durango, Mexico [Member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Beginning balance 9,692 9,034
Mine and camp costs
Provision for reclamation  
Effect of movements in exchange rates (6) 226
Drilling and exploration 50 346
Depreciation of plant and equipment
Interest and financing costs
Geological and related services
Water treatment and tailing storage facility costs
Assessments and taxes 90 86
Assays
Disposition of Bralorne Mine  
Ending balance 9,826 9,692
British Columbia & Yukon, Canada [Member]    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Beginning balance 37,089 34,304
Mine and camp costs 2,537 3,143
Provision for reclamation 1,338  
Effect of movements in exchange rates 1,286 (2,754)
Drilling and exploration 2,333 1,142
Depreciation of plant and equipment 317 540
Interest and financing costs 325 414
Geological and related services 116 205
Water treatment and tailing storage facility costs 112 53
Assessments and taxes 31 29
Assays 130 13
Disposition of Bralorne Mine (45,613)  
Ending balance $ 1 $ 37,089