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COMMITMENTS AND CONTINGENCIES: (Tables)

3 Months Ended

Mar. 31, 2021

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

Environmental capital investments in the first quarter of 2021 and 2020 were as follows (in millions):

​

​	​	​	​	​	​	​
​		2021			2020
Peruvian operations	​	$	0.1	​	$	2.5
Mexican operations	​		5.4	​		9.9
​	​	$	5.5	​	$	12.4

​

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