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COMMITMENTS AND CONTINGENCIES: (Tables)
6 Months Ended
Jun. 30, 2024
COMMITMENTS AND CONTINGENCIES:  
Schedule of environmental capital investments

Environmental capital investments in the six-month period ended June 30, 2024 and 2023 were as follows (in millions):

    

2024

    

2023

Peruvian operations

$

2.0

$

3.5

Mexican operations

 

92.8

 

43.9

$

94.8

$

47.4