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COMMITMENTS AND CONTINGENCIES: (Tables)

3 Months Ended

Mar. 31, 2023

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

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

​	​	​	​	​	​	​
​		2023			2022
Peruvian operations	​	$	2.7	​	$	1.4
Mexican operations	​		23.2	​		12.6
​	​	$	25.9	​	$	14.0

​

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