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COMMITMENTS AND CONTINGENCIES: - Labor matters (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 14, 2023
Feb. 28, 2025
USD ($)
item
Dec. 31, 2024
USD ($)
item
Sep. 30, 2025
item
employee
Jun. 30, 2025
item
Ilo and Cuajone          
Labor matters          
Number of labor unions       6  
Peru | Labor Matters          
Labor matters          
Percentage of labor unionized       52.60%  
Total number of workers | employee       5,294  
Number of labor unions     6 6  
Number of labor unions represent majority of workers       0  
Number of labor unions of collective agreement signed     5   6
Extended term of agreement   3 years 6 years    
Total signing payments | $   $ 6.3 $ 62.0    
Number of meetings with the unions to discuss different issues of collective interest   6      
Mexico          
Labor matters          
Threshold days to resume activities 15 days