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SIGNIFICANT ACCOUNTING POLICIES (Details)
 12 Months Ended
Dec. 31, 2020
Computer equipment [member]  
Statement [Line Items]  
Depreciation rates and methods of plant and equipment 5 years straight line balance
Buildings [Member] | Bottom of range [member]  
Statement [Line Items]  
Depreciation rates and methods of plant and equipment 5 years straight line
Buildings [Member] | Top of range [member]  
Statement [Line Items]  
Depreciation rates and methods of plant and equipment 20 years straight line
Office equipment, furniture, and fixtures [Member]  
Statement [Line Items]  
Depreciation rates and methods of plant and equipment 3 years straight line balance
Mine machinery and transportation equipment [Member]  
Statement [Line Items]  
Depreciation rates and methods of plant and equipment 5 years straight line balance
Mill machinery and processing equipment [Member] | Bottom of range [member]  
Statement [Line Items]  
Depreciation rates and methods of plant and equipment 5 years straight line
Mill machinery and processing equipment [Member] | Top of range [member]  
Statement [Line Items]  
Depreciation rates and methods of plant and equipment 20 years straight line