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COMMITMENTS AND CONTINGENCIES: (Tables)
 6 Months Ended
Jun. 30, 2015
COMMITMENTS AND CONTINGENCIES:  
Schedule of environmental capital investments

 

 

Environmental capital expenditures in the six months ended June 30, 2015 and 2014 were as follows (in millions):

 

 

2015

 

2014

 

Peruvian operations

 

$
33.1 

 

$
53.9 

 

Mexican operations

 
6.9 

 
7.5 

 

 

 

 

 

 

 

 

 

$
40.0 

 

$
61.4