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COMMITMENTS AND CONTINGENCIES: (Tables)
 6 Months Ended
Jun. 30, 2016
COMMITMENTS AND CONTINGENCIES:  
Schedule of environmental capital investments

Environmental capital investments in the six months ended June 30, 2016 and 2015 were as follows ($ in millions):

 

 

 

2016

 

2015

 

Peruvian operations

 

$
36.2 

 

$
38.0 

 

Mexican operations

 
69.5 

 
6.9 

 

 

 

 

 

 

 

 

 

$
105.7 

 

$
44.9