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COMMITMENTS AND CONTINGENCIES: (Tables) | 9 Months Ended
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Sep. 30, 2018
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | Environmental capital investments in the nine months ended September 30, 2018 and 2017 were as follows (in millions):
|  | 2018 |  | 2017 |
Peruvian operations |  | $ | 38.0 |  | $ | 60.5 |
Mexican operations |  | 35.3 |  | 95.1 |
|  | $ | 73.3 |  | $ | 155.6 |

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