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COMMITMENTS AND CONTINGENCIES: (Tables)

12 Months Ended

Dec. 31, 2023

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

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Environmental capital investments in years 2023, 2022 and 2021, were as follows (in millions):

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​	​	​	​	​	​	​	​	​	​
​		2023			2022			2021
Peruvian operations	​	$	7.7	​	$	8.7	​	$	6.4
Mexican operations	​		100.6	​		52.7	​		62.3
​	​	$	108.3	​	$	61.4	​	$	68.7

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