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PLANT EQUIPMENT AND MINING PROPERTIES (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
COST      
Beginning balance $ 55,760,000 $ 54,262,000  
Additions/ Transfers 2,159,000 1,488,000  
Effect of movements in exchange rates 3,000 10,000  
Ending balance 57,922,000 55,760,000  
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 20,914,000 18,604,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 1,610,000 2,310,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates 0 0  
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 22,524,000 20,914,000  
NET BOOK VALUE      
Plant, equipment and mining properties 35,398,000 34,846,000 $ 35,658,000
Office equipment, furniture, and fixtures [Member]      
COST      
Beginning balance 563,000 524,000  
Effect of movements in exchange rates 0 6,000  
Ending balance 593,000 563,000  
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 187,000 84,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 81,000 103,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates 0 0  
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 268,000 187,000  
NET BOOK VALUE      
Plant, equipment and mining properties 325,000 376,000 440,000
ACCUMULATED DEPLETION AND DEPRECIATION      
Additions / Transfers 30,000 34,000  
Mine machinery and transportation equipment [Member]      
COST      
Beginning balance 12,955,000 12,919,000  
Ending balance 14,200,000 12,955,000  
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 4,907,000 4,854,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 46,000 53,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates 0 0  
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 4,953,000 4,907,000  
NET BOOK VALUE      
Plant, equipment and mining properties 9,247,000 8,048,000 8,065,000
ACCUMULATED DEPLETION AND DEPRECIATION      
Effect of movements in exchange rates 0 0  
Additions / Transfers 1,245,000 36,000  
Mill machinery and processing equipment [Member]      
COST      
Beginning balance 17,483,000 17,554,000  
Ending balance 17,916,000 17,483,000  
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 5,297,000 4,013,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 1,067,000 1,284,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates 0 0  
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 6,364,000 5,297,000  
NET BOOK VALUE      
Plant, equipment and mining properties 11,552,000 12,186,000 13,541,000
ACCUMULATED DEPLETION AND DEPRECIATION      
Effect of movements in exchange rates 0 0  
Additions / Transfers 433,000 (71,000)  
Mining Property [Member]      
COST      
Beginning balance 13,149,000 13,637,000  
Additions/ Transfers 0 (493,000)  
Ending balance 13,151,000 13,149,000  
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 8,643,000 8,066,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 160,000 577,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates 0 0  
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 8,803,000 8,643,000  
NET BOOK VALUE      
Plant, equipment and mining properties 4,348,000 4,506,000 5,571,000
ACCUMULATED DEPLETION AND DEPRECIATION      
Effect of movements in exchange rates 2,000 5,000  
Computer equipment [member]      
COST      
Beginning balance 347,000 341,000  
Ending balance 362,000 347,000  
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 256,000 213,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 43,000 43,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates 0 0  
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 299,000 256,000  
NET BOOK VALUE      
Plant, equipment and mining properties 63,000 91,000 128,000
ACCUMULATED DEPLETION AND DEPRECIATION      
Effect of movements in exchange rates 0 0  
Additions / Transfers 15,000 6,000  
Buildings [Member]      
COST      
Beginning balance 11,263,000 9,287,000  
Ending balance 11,700,000 11,263,000  
ACCUMULATED DEPLETION AND DEPRECIATION, beginning balance 1,624,000 1,374,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Additions / Transfers 213,000 250,000  
ACCUMULATED DEPLETION AND DEPRECIATION, Effect of movements in exchange rates 0 0  
ACCUMULATED DEPLETION AND DEPRECIATION, Ending balance 1,837,000 1,624,000  
NET BOOK VALUE      
Plant, equipment and mining properties 9,863,000 9,639,000 $ 7,913,000
ACCUMULATED DEPLETION AND DEPRECIATION      
Effect of movements in exchange rates 1,000 0  
Additions / Transfers $ 436,000 $ 1,976,000