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CONCENTRATION OF RISK: (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
Dec. 31, 2020
Concentration of risk      
Number of open-pit copper mines | item 4    
Number of underground poly metallic mines | item 5    
Number of smelters | item 2    
Number of refineries | item 9    
Total cash and short-term investment $ 2,278.0    
Cash equivalents      
Concentration of risk      
Total cash and short-term investment $ 2,278.0    
Percentage of total cash 100.00%    
Percentage of cash in US dollars 96.40%    
Cash equivalents | United States      
Concentration of risk      
Total cash and short-term investment $ 1,903.8    
Percentage of total cash 83.60%    
Percentage invested in one institution of country 12.40%    
Percentage invested in one institution of total cash 10.30%    
Cash equivalents | Switzerland      
Concentration of risk      
Total cash and short-term investment $ 227.2    
Percentage of total cash 10.00%    
Percentage invested in one institution of country 100.00%    
Percentage invested in one institution of total cash 10.00%    
Cash equivalents | Peru      
Concentration of risk      
Total cash and short-term investment $ 41.6    
Percentage of total cash 1.80%    
Percentage invested in one institution of country 75.10%    
Percentage invested in one institution of total cash 1.40%    
Cash equivalents | Mexico      
Concentration of risk      
Total cash and short-term investment $ 105.4    
Percentage of total cash 4.60%    
Percentage invested in one institution of country 56.40%    
Percentage invested in one institution of total cash 2.60%    
Accounts receivable trade | Five largest customers | Customer      
Concentration of risk      
Percentage of accounts receivable and total sales 34.20% 31.30% 35.30%
Accounts receivable trade | Largest customer | Customer      
Concentration of risk      
Percentage of accounts receivable and total sales 10.40% 11.80% 12.90%
Total sales | Five largest customers | Customer      
Concentration of risk      
Percentage of accounts receivable and total sales 25.70% 25.00% 28.10%
Total sales | Largest customer | Customer      
Concentration of risk      
Percentage of accounts receivable and total sales 6.80% 7.20% 10.00%