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COMMITMENTS AND CONTINGENCIES: (Tables) | 9 Months Ended
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Sep. 30, 2019
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | Environmental capital investments in the nine months ended September 30, 2019 and 2018 were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Peruvian operations | ​ | $ | 12.9 | ​ | $ | 38.0
Mexican operations | ​ |  | 55.9 | ​ |  | 35.3
​ | ​ | $ | 68.8 | ​ | $ | 73.3
​

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