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COMMITMENTS AND CONTINGENCIES: (Tables) | 6 Months Ended
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Jun. 30, 2018
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | Environmental capital investments in the six months ended June 30, 2018 and 2017 were as follows (in millions):
|  | 2018 |  | 2017 |
Peruvian operations |  | $ | 18.0 |  | $ | 44.5 |
Mexican operations |  | 26.5 |  | 35.8 |
|  | $ | 44.5 |  | $ | 80.3 |

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