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PLANT EQUIPMENT AND MINING PROPERTIES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
COST    
Beginning balance $ 54,262 $ 55,039
Additions/ Transfers 1,488 3,289
Disposals   (4,178)
Effect of movements in exchange rates 10 112
Ending balance 55,760 54,262
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 18,604 16,296
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 2,310 4,407
ACCUMULATED DEPLETION AND DEPRECIATION, Disposals   (2,130)
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates   31
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 20,914 18,604
NET BOOK VALUE    
Plant, equipment and mining properties 34,846 35,658
Office equipment, furniture, and fixtures [Member]    
COST    
Beginning balance 524 149
Disposals   (6)
Effect of movements in exchange rates 5  
Ending balance 563 524
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 84 65
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 103 22
ACCUMULATED DEPLETION AND DEPRECIATION, Disposals   (3)
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates   0
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 187 84
NET BOOK VALUE    
Plant, equipment and mining properties 376 440
ACCUMULATED DEPLETION AND DEPRECIATION    
Additions / Transfers 34 381
Mine machinery and transportation equipment [Member]    
COST    
Beginning balance 12,919 17,257
Disposals   (3,723)
Ending balance 12,955 12,919
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 4,854 6,830
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 53 51
ACCUMULATED DEPLETION AND DEPRECIATION, Disposals   (2,040)
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates   13
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 4,907 4,854
NET BOOK VALUE    
Plant, equipment and mining properties 8,048 8,065
Effect of movements in exchange rates   33
ACCUMULATED DEPLETION AND DEPRECIATION    
Additions / Transfers 36 (648)
Mill machinery and processing equipment [Member]    
COST    
Disposals   (231)
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 4,013 2,416
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 1,284 1,619
ACCUMULATED DEPLETION AND DEPRECIATION, Disposals   (27)
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates   5
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 5,297 4,013
NET BOOK VALUE    
Plant, equipment and mining properties 12,186 13,541
Effect of movements in exchange rates   34
ACCUMULATED DEPLETION AND DEPRECIATION    
Additions / Transfers (71) 148
Beginning balance 17,554 17,603
Ending balance 17,483 17,554
Computer equipment [member]    
COST    
Beginning balance 341 358
Disposals   (12)
Ending balance 347 341
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 213 175
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 43 49
ACCUMULATED DEPLETION AND DEPRECIATION, Disposals   (11)
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates   0
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 256 213
NET BOOK VALUE    
Plant, equipment and mining properties 91 128
Effect of movements in exchange rates   1
ACCUMULATED DEPLETION AND DEPRECIATION    
Additions / Transfers 6 (6)
Mining Property [member]    
COST    
Beginning balance 13,637 12,962
Additions/ Transfers (493) 644
Ending balance 13,149 13,637
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 8,066 6,102
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 577 1,952
ACCUMULATED DEPLETION AND DEPRECIATION, Disposals   0
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates   12
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 8,643 8,066
NET BOOK VALUE    
Plant, equipment and mining properties 4,506 5,571
Effect of movements in exchange rates 5 31
Buildings [Member]    
COST    
Disposals   (206)
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 1,374 708
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 250 714
ACCUMULATED DEPLETION AND DEPRECIATION, Disposals   (49)
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates   1
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 1,624 1,374
NET BOOK VALUE    
Plant, equipment and mining properties 9,639 7,913
Effect of movements in exchange rates   13
ACCUMULATED DEPLETION AND DEPRECIATION    
Additions / Transfers 1,976 2,770
Beginning balance 9,287 6,710
Ending balance $ 11,263 $ 9,287