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COMMITMENTS AND CONTINGENCIES: (Tables)

12 Months Ended

Dec. 31, 2019

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

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Environmental capital investments in years 2019, 2018 and 2017, were as follows (in millions):

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​	​	​	​	​	​	​	​	​	​
​		2019			2018			2017
Peruvian operations	​	$	18.6	​	$	59.3	​	$	93.7
Mexican operations	​		64.3	​		43.5	​		128.9
​	​	$	82.9	​	$	102.8	​	$	222.6

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