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DESCRIPTION OF THE BUSINESS: (Details)
$ in Millions
 3 Months Ended
Feb. 28, 2022
USD ($)
community
item
Mar. 31, 2022
USD ($)
T
Percentage of ownership interest held by the parent company   88.90%
Ilo and Cuajone    
Number of members in group of protesters | item 472  
Number of people in community. | community 5,000  
Compensation for usurped land use $ 5,000.0  
Percentage of net profits 5.00%  
Reduction in sales   $ 117.0
Unabsorbed fixed costs   $ 7.9
Copper | Ilo and Cuajone    
Production loss | T   12,869
Molybdenum | Ilo and Cuajone    
Production loss | T   296