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COMMITMENTS AND CONTINGENCIES: (Tables) | 6 Months Ended
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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 |

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