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COMMITMENTS AND CONTINGENCIES: (Tables)
 3 Months Ended
Mar. 31, 2017
COMMITMENTS AND CONTINGENCIES:  
Schedule of environmental capital investments

 

Environmental capital investments in the three months ended March 31, 2017 and 2016 were as follows (in millions):

 

 

 

2017

 

2016

 

Peruvian operations

 

$
16.5

 

$
10.1

 

Mexican operations

 
22.1

 
29.1

 

 

 

 

 

 

 

 

 

$
38.6

 

$
39.2