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COMMITMENTS AND CONTINGENCIES: (Tables)

12 Months Ended

Dec. 31, 2021

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital investments

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Environmental capital investments in years 2021, 2020 and 2019, were as follows (in millions):

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​	​	​	​	​	​	​	​	​	​
​		2021			2020			2019
Peruvian operations (*)	​	$	6.4	​	$	(3.3)	​	$	18.6
Mexican operations	​		62.3	​		41.1	​		64.3
​	​	$	68.7	​	$	37.8	​	$	82.9

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

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