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COMMITMENTS AND CONTINGENCIES: (Tables) | 12 Months Ended
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Dec. 31, 2020
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | ​ Environmental capital investments in years 2020, 2019 and 2018, were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Peruvian operations (*) | ​ | $ | (3.3) | ​ | $ | 18.6 | ​ | $ | 59.3
Mexican operations | ​ |  | 41.1 | ​ |  | 64.3 | ​ |  | 43.5
​ | ​ | $ | 37.8 | ​ | $ | 82.9 | ​ | $ | 102.8
(*)The activity in 2020 includes prepayment settlements classified to expenses. ​

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