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COMMITMENTS AND CONTINGENCIES: (Tables)
 6 Months Ended
Jun. 30, 2017
COMMITMENTS AND CONTINGENCIES:  
Schedule of environmental capital investments

 

Environmental capital investments in the six months ended June 30, 2017 and 2016 were as follows (in millions):

 

 

2017

 

2016

 

Peruvian operations

 

$
44.5

 

$
36.2

 

Mexican operations

 
35.8

 
69.5

 

 

 

 

 

 

 

 

 

$
80.3

 

$
105.7