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COMMITMENTS AND CONTINGENCIES: (Tables) | 3 Months Ended
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Mar. 31, 2020
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | Environmental capital investments in the three months ended March 31, 2020 and 2019 were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Peruvian operations | ​ | $ | 2.5 | ​ | $ | 10.2
Mexican operations | ​ |  | 9.9 | ​ |  | 9.0
​ | ​ | $ | 12.4 | ​ | $ | 19.2
​

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