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COMMITMENTS AND CONTINGENCIES: (Tables) | 3 Months Ended
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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 |

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- Definition Tabular disclosure of environmental capital expenditures incurred during the period. + References No definition available. + Details
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