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COMMITMENTS AND CONTINGENCIES: (Tables)

9 Months Ended

Sep. 30, 2019

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

Environmental capital investments in the nine months ended September 30, 2019 and 2018 were as follows (in millions):

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​	​	​	​	​	​	​
​		2019			2018
Peruvian operations	​	$	12.9	​	$	38.0
Mexican operations	​		55.9	​		35.3
​	​	$	68.8	​	$	73.3

​

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