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COMMITMENTS AND CONTINGENCIES: (Tables) | 12 Months Ended
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Dec. 31, 2022
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | ​ Environmental capital investments in years 2022, 2021 and 2020, were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2022 |  | 2021 |  | 2020
Peruvian operations (*) | ​ | $ | 8.7 | ​ | $ | 6.4 | ​ | $ | (3.3)
Mexican operations | ​ |  | 52.7 | ​ |  | 62.3 | ​ |  | 41.1
​ | ​ | $ | 61.4 | ​ | $ | 68.7 | ​ | $ | 37.8
(*)The activity in 2020 includes prepayment settlements classified to expenses. ​

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