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COMMITMENTS AND CONTINGENCIES: (Tables)
 3 Months Ended
Mar. 31, 2016
COMMITMENTS AND CONTINGENCIES:  
Schedule of environmental capital investments

 

Environmental capital investments in the three months ended March 31, 2016 and 2015 were as follows (in millions):

 

 

 

2016

 

2015

 

Peruvian operations

 

$
10.1 

 

$
17.4 

 

Mexican operations

 
29.1 

 
3.2 

 

 

 

 

 

 

 

 

 

$
39.2 

 

$
20.6