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COMMITMENTS AND CONTINGENCIES: (Tables) | 9 Months Ended
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Sep. 30, 2023
COMMITMENTS AND CONTINGENCIES: |
Schedule of environmental capital investments | ​ Environmental capital investments in the nine months of 2023 and 2022 were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
Peruvian operations | ​ | $ | 5.5 | ​ | $ | 7.1
Mexican operations | ​ |  | 72.1 | ​ |  | 35.4
​ | ​ | $ | 77.6 | ​ | $ | 42.5
​

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