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COMMITMENTS AND CONTINGENCIES: (Tables) | 6 Months Ended
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Jun. 30, 2021
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | ​ Environmental capital investments in the first six months of 2021 and 2020 were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020
Peruvian operations | ​ | $ | 0.7 | ​ | $ | (5.5)
Mexican operations | ​ |  | 21.8 | ​ |  | 19.4
​ | ​ | $ | 22.5 | ​ | $ | 13.9
(*) The activity in 2020 for the Peruvian operations includes prepayment settlements classified to expenses. ​

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