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SIGNIFICANT ACCOUNTING POLICIES - Property, plant and equipment (Details)
 12 Months Ended
Dec. 31, 2021
Property & Buildings  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives 25 years
Geological Equipment  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives 2 years
Computer Equipment  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives 2 years
Vehicles  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives 3 years