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COMMITMENTS AND CONTINGENCIES: (Tables)
 12 Months Ended
Dec. 31, 2018
COMMITMENTS AND CONTINGENCIES:  
Schedule of environmental capital investments

 

Environmental capital investments in years 2018, 2017 and 2016, were as follows (in millions):

 

 

 

 

 

 

 

 

 

 

 

 

    

2018

    

2017

    

2016

Peruvian operations

 

$

59.3

 

$

93.7

 

$

110.3

Mexican operations

 

 

43.5

 

 

128.9

 

 

140.1

Total

 

$

102.8

 

$

222.6

 

$

250.4