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COMMITMENTS AND CONTINGENCIES: (Tables)
12 Months Ended
Dec. 31, 2022
COMMITMENTS AND CONTINGENCIES:  
Schedule of environmental capital investments

Environmental capital investments in years 2022, 2021 and 2020, were as follows (in millions):

    

2022

    

2021

    

2020

Peruvian operations (*)

$

8.7

$

6.4

$

(3.3)

Mexican operations

 

52.7

 

62.3

 

41.1

$

61.4

$

68.7

$

37.8

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