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DESCRIPTION OF THE BUSINESS: (Details)
 9 Months Ended
Sep. 30, 2021
$ / lb
$ / item
Percentage of ownership interest held by the parent company 88.90%
Percentage of operating over production capacity during COVID-19 time 96.00%
Copper price assumption | $ / lb 2.00
Molybdenum price assumption | $ / item 4.00
Minimum  
Projected discounted cash flows in excess of the carrying amounts of long lived assets by margins 1.3
Maximum  
Projected discounted cash flows in excess of the carrying amounts of long lived assets by margins 4.3
Peru  
Percentage workforce working on site under strict safety measures 71.00%
Mexico  
Percentage workforce working on site under strict safety measures 96.00%