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COMMITMENTS AND CONTINGENCIES: (Tables) | 3 Months Ended
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Mar. 31, 2018
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | Environmental capital investments in the three months ended March 31, 2018 and 2017 were as follows (in millions):
|  | 2018 |  | 2017 |
Peruvian operations |  | $ | 6.5 |  | $ | 16.5 |
Mexican operations |  | 19.9 |  | 22.1 |
|  | $ | 26.4 |  | $ | 38.6 |

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