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COMMITMENTS AND CONTINGENCIES: (Tables)

3 Months Ended

Mar. 31, 2020

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

Environmental capital investments in the three months ended March 31, 2020 and 2019 were as follows (in millions):

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​	​	​	​	​	​	​
​		2020			2019
Peruvian operations	​	$	2.5	​	$	10.2
Mexican operations	​		9.9	​		9.0
​	​	$	12.4	​	$	19.2

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