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COMMITMENTS AND CONTINGENCIES: (Tables) | 9 Months Ended
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Sep. 30, 2017
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | Environmental capital investments in the nine months ended September 30, 2017 and 2016 were as follows (in millions):
|  | 2017 |  | 2016 |
Peruvian operations |  | $ | 60.5 |  | $ | 58.7 |
Mexican operations |  | 95.1 |  | 101.2 |
|  | $ | 155.6 |  | $ | 159.9 |

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