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COMMITMENTS AND CONTINGENCIES: - Guaymas sulfuric acid spill (Details)
3 Months Ended
Jul. 19, 2019
item
Jul. 09, 2019
Mar. 31, 2022
USD ($)
item
T
$ / item
Climate change [Member]      
Number of business units | item     2
Threshold annual greenhouse gas emissions | T     100,000
Climate change [Member] | Minimum      
Tax rate per tonne Of Carbon dioxide | $ / item     2.5
Threshold annual greenhouse gas emissions reporting to National emissions registry | T     25,000
Climate change [Member] | Maximum      
Tax rate per tonne Of Carbon dioxide | $ / item     12.5
Average cost per business unit | $     $ 6,000
Marine Terminal in Guaymas      
Volume of sulfuric acid discharged in the incident at Guaymas | m³   3  
Water volume at Guaymas bay | m³     340,000,000
Number of times of renewal | item 4    
Number of years of each renewal 2 years