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COMMITMENTS AND CONTINGENCIES: (Tables)

12 Months Ended

Dec. 31, 2020

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

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Environmental capital investments in years 2020, 2019 and 2018, were as follows (in millions):

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​	​	​	​	​	​	​	​	​	​
​		2020			2019			2018
Peruvian operations (*)	​	$	(3.3)	​	$	18.6	​	$	59.3
Mexican operations	​		41.1	​		64.3	​		43.5
​	​	$	37.8	​	$	82.9	​	$	102.8

(*)The activity in 2020 includes prepayment settlements classified to expenses.

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