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COMMITMENTS AND CONTINGENCIES: (Tables)

9 Months Ended

Sep. 30, 2025

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

Environmental capital investments in the nine-month periods ended September 30, 2025 and 2024 were as follows (in millions):

​	​	​	​	​	​	​
​		2025			2024
Peruvian operations	​	$	16.0	​	$	3.5
Mexican operations	​		142.6	​		133.2
​	​	$	158.6	​	$	136.8

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