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COMMITMENTS AND CONTINGENCIES: (Tables) | 12 Months Ended
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Dec. 31, 2023
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | ​ Environmental capital investments in years 2023, 2022 and 2021, were as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021
Peruvian operations | ​ | $ | 7.7 | ​ | $ | 8.7 | ​ | $ | 6.4
Mexican operations | ​ |  | 100.6 | ​ |  | 52.7 | ​ |  | 62.3
​ | ​ | $ | 108.3 | ​ | $ | 61.4 | ​ | $ | 68.7
​

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