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COMMITMENTS AND CONTINGENCIES: (Tables)
9 Months Ended
Sep. 30, 2023
COMMITMENTS AND CONTINGENCIES:  
Schedule of environmental capital investments

Environmental capital investments in the nine months of 2023 and 2022 were as follows (in millions):

    

2023

    

2022

Peruvian operations

$

5.5

$

7.1

Mexican operations

 

72.1

 

35.4

$

77.6

$

42.5