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COMMITMENTS AND CONTINGENCIES: - Guaymas sulfuric acid spill (Details)
 12 Months Ended
Jul. 19, 2019
item
Jul. 09, 2019
m³
Dec. 31, 2021
USD ($)
item
T
$ / item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
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    
Compliance costs related to climate change regulations | $     $ 30,000 $ 30,000 $ 30,000
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