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COMMITMENTS AND CONTINGENCIES: (Tables) | 12 Months Ended
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Dec. 31, 2019
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | ​ Environmental capital investments in years 2019, 2018 and 2017, were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
Peruvian operations | ​ | $ | 18.6 | ​ | $ | 59.3 | ​ | $ | 93.7
Mexican operations | ​ |  | 64.3 | ​ |  | 43.5 | ​ |  | 128.9
​ | ​ | $ | 82.9 | ​ | $ | 102.8 | ​ | $ | 222.6
​

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