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COMMITMENTS AND CONTINGENCIES: (Tables)

3 Months Ended

Mar. 31, 2024

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

Environmental capital investments in the three-month period ended March 31, 2024 and 2023 were as follows (in millions):

​	​	​	​	​	​	​
​		2024			2023
Peruvian operations	​	$	1.6	​	$	2.7
Mexican operations	​		42.1	​		23.2
​	​	$	43.7	​	$	25.9

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