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COMMITMENTS AND CONTINGENCIES: (Tables)

6 Months Ended

Jun. 30, 2023

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

​

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

​	​	​	​	​	​	​
​		2023			2022
Peruvian operations	​	$	3.5	​	$	2.9
Mexican operations	​		43.9	​		27.2
​	​	$	47.4	​	$	30.1

​

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