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COMMITMENTS AND CONTINGENCIES: (Tables)

3 Months Ended

Mar. 31, 2022

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

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Environmental capital investments in the first quarter of 2022 and 2021 were as follows (in millions):

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​	​	​	​	​	​	​
​		2022			2021
Peruvian operations	​	$	1.4	​	$	0.1
Mexican operations	​		12.6	​		5.4
​	​	$	14.0	​	$	5.5

​

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